Digitally-Mediated Practices of Geospatial Archaeological Data: Transformation, Integration, & Interpretation 1. Introduction Digital archaeology has burgeoned over the past decade, with archaeologists tending to focus on data acquisi- tion tools such as terrestrial laser scanning (Remondino et al. 2009), airborne LiDAR (Chase et al. 2011; Prufer, Thompson & Kennett 2015; von Schwerin et al. 2016), pho- togrammetry (Saperstein 2016), or on visualization using virtual and augmented reality. Recently, scholars are call- ing for greater introspection of digital practices, mirroring late 1990s pushes for Geographic Information Systems (GIS) to go “beyond the map” (Aldenderfer and Maschner 1996; Forte 2014; Lock 2000; Maschner 1996). These calls ask archaeologists to shift focus from digital data acquisi- tion to the unique affordances of the digital for archaeo- logical research questions (Gunnarsson 2018; Huggett 2015; Roosevelt et al. 2015). While new conversations are evolving that address impacts in both the digital humani- ties and digital archaeology (e.g. Benardou et al. 2018; Dal- las 2007; Holdaway, Emmitt, Phillipps & Masoud-Ansari 2019; MacFarland and Vokes 2016; Wright and Richards 2018), effects of the digital on archaeological practice and scholarship remain understudied. For example, initial conversations on preservation of cultural heritage mate- rials have shifted to include access and reuse—focusing not simply on making data available for future inspection, but also preparing them for contemporary reuse (Clarke 2015; Esteva et al. 2010; Lukas, Engel & Mazzucato 2018; MacFarland and Vokes 2016; Ullah 2015; Witcher 2008; Wylie 2017). In this vein, we focus on transforming analog legacy data to digital geospatial data (i.e. data that have real-world spatial reference) for the purpose of “min[ing] old data sets for new insights that redirect inquiry” (Wylie 2017: 203). Specifically, we ask: What can we learn as we convert analog data to geospatial data? And, how does digital data transformation, integration, and interpreta- tion impact archaeological practice and scholarship? Archaeological fieldwork and lab work involve digital data acquisition, for example, capturing Global Positioning System (GPS)/Global Navigation Satellite System (GNSS) points, digital photos, and 3D point clouds; however, digitization also involves capturing data by scanning analog data, particularly legacy data such as field notes, photographs, or drawings to a digital format Richards-Rissetto, H and Landau, K. (2019). Digitally-Mediated Practices of Geospatial Archaeological Data: Transformation, Integration, & Interpretation. Journal of Computer Applications in Archaeology, 2(1), pp. 120–135. DOI: https://doi.org/10.5334/jcaa.30 * University of Nebraska-Lincoln, US † Alma College, US Corresponding author: Heather Richards-Rissetto (richards-rissetto@unl.edu) POSITION PAPER Digitally-Mediated Practices of Geospatial Archaeological Data: Transformation, Integration, & Interpretation Heather Richards-Rissetto* and Kristin Landau† Digitally-mediated practices of archaeological data require reflexive thinking about where archaeology stands as a discipline in regard to the ‘digital,’ and where we want to go. To move toward this goal, we advocate a historical approach that emphasizes contextual source-side criticism and data intimacy—scrutiniz- ing maps and 3D data as we do artifacts by analyzing position, form, material and context of analog and digital sources. Applying this approach, we reflect on what we have learned from processes of digitally-mediated data. We ask: What can we learn as we convert analog data to digital data? And, how does digital data transformation impact the chain of archaeological practice? Primary, or raw data, are produced using various technologies ranging from Global Navigation Satellite System (GNSS)/Global Posi- tioning System (GPS), LiDAR, digital photography, and ground penetrating radar, to digitization, typically using a flat-bed scanner to transform analog data such as old field notes, photographs, or drawings into digital data. However, archaeologists not only collect primary data, we also make substantial time invest- ments to create derived data such as maps, 3D models, or statistics via post-processing and analysis. While analog data is typically static, digital data is more dynamic, creating fundamental differences in digitally-mediated archaeological practice. To address some issues embedded in this process, we describe the lessons we have learned from translating analog to digital geospatial data—discussing what is lost and what is gained in translation, and then applying what we have learned to provide concrete insights to archaeological practice. Keywords: Digitally-mediated archaeology; geospatial; archaeological practice; historical approach; Mesoamerica; data intimacy; paradata journal of computer applications in archaeology Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data 121 (Allison 2008; Gaffney, Stančič & Watson 1995; Smith 1995; Wylie 2017). As archaeologists, we collect primary, or ‘raw’ data of extant archaeological features and artifacts that we often use to create ‘derived’ data such as maps, 3D models, and statistics based on post-processing, analy- sis, and interpretation (Beale and Reilly 2017; Costa et al. 2013; Faniel et al. 2013; Huggett 2015; Kansa and Kansa 2018; Kintigh et al. 2017). These raw data often need to be digitzed—changed from analog to digital—to be useful for digital technologies and methods. Archaeologists employ numerous software including databases, Geographic Information Systems (GIS), photogrammetric tools, and 3D environments to process, integrate, and analyze archaeological data; in other words, we transform analog and digital ‘items’ to create new (derived) data for archaeological research. Additionally, we create ‘natively digital,’ ‘digital-first,’ ‘digital-exclusive,’ or ‘intrinsic born’ digital data (Austin 2014). In contrast to digitization of analog data, such natively digital data come from post-processing primary data or generating data that do not or did not have a physical counterpart. This process creates new challenges and opportunities in archaeological scholarship (Digital Preservation Coalition 2015; Forte 2014). For example, we use flatbed scanners to digitize a site map recorded in a field notebook to convert the analog page into a digital format such as a Tagged Image File Format (TIFF). While a TIFF is machine- readable, the data require post-processing to be useful for geospatial analysis. For example, the scanned map must be georeferenced to provide real-world coordinates and scale; it must also be vectorized to provide data for analysis in a GIS or other platform. In other words, post- processing necessitates multiple steps of human decision- making, producing numerous file types, and results in new data. The creation of new data through digitization, most often but not always through post-processing, is called datafication. Some scholars define datafication as “transforming objects, processes, etc. in a quantified format so they can be tabulated and analysed” (Gattiglia 2015: 115, emphasis ours; Mayer-Schönberger and Cukier 2013). In contrast, we contend that datafication outputs are not limited to quan- tifiable data, and we recommend shifting the definition of datafication to emphasize process i.e. the transforma- tion and translation of objects and processes rather than outputs (Richards-Rissetto 2017b). Basically, in contrast to digitization which ‘replicates’ original data, datafication creates derived, or new data, which requires human trans- lation (interpretation) and encourages unique considera- tions for archaeological scholarship. Datafication of both born-digital and analog formats offer archaeology more than either can do alone. Datafication involves what digital scholars call metadata and paradata. While the term metadata describes infor- mation about the data themselves (Clarke 2015; Esteva et al. 2010; Hodder 1997; Roosevelt et al. 2017; Ullah 2015; Witcher 2008), paradata more specifically concern intrepetive decisions. Recording paradata, the “informa- tion choices or the process of interpretation so that the aims, contexts and reliability” of methods can be evalu- ated (Bentkowska-Kafel and Denard 2012:1) is a major challenge. With digital data, in particular geospatial and 3D modeling and visualization, archaeologists can eas- ily modify raw and derived data to generate new derived data. However, retracing our steps is not straightforward, though transparency is necessary for others to assess data quality as well as analytical results (Huggett 2014; Kansa et al. 2010). Datafication mandates not only metadata but also paradata, thus requiring unique practices for digital scholarship in archaeology (see below). However, datafica- tion also brings a great opportunity for data intimacy: a deep familiarity with the data that affects perception and affords new insights (Cavillo and Garnett 2019; Fahmie and Hanley 2008; Hong 2016). Intimacy is increasingly essential for a digitally-mediated archaeology in which data transformation, integration, and creation is anything but straightforward. Archaeological data is heterogeneous, making not only the data messy, but perhaps more importantly mak- ing the scientific process itself messy; research does not proceed in an orderly series of steps (Boyer 1990). Yet this messiness affords new opportunities for data integration that require deep interdisciplinary think- ing and often lead to innovative methods and analyses (Demján and Dreslerová 2016; Harrison 2018; Kansa 2010; Kintigh 2006; von Schwerin, Lyons et al. 2016). Even in cases where digitization/datafication stand- ards or best practices exist (e.g. Open Geospatial Con- sortium), researchers still must make numerous deci- sions as we generate digital data. This decision-making process is not a new aspect of digital archaeological practice (Hodder 1997; Hodder 2003). For example, in hand-drawing profiles we decide on important points (x, y, and z) to map based on previous knowledge, experi- ence, objectives, etc. However, in generating born-digital and derived digital data we often make black box deci- sions (Caraher 2016) based on convention or ‘mysterious’ software algorithms. Given the emerging nature of digital technologies and tools, we often make decisions based on trial and error, searching the internet for solutions, or con- tacting colleagues. Also, because digital data are dynamic (Alberts, Went & Jansma 2017), our initial choices more easily and readily change, leading to new challenges and advantages in digitally-mediated archaeology. Because of the dynamic nature of digital data and technologies, we contend that digitally-mediated data transformation, integration, and interpretation require reflexive, iterative thinking—we must be more aware of our decision-making processes (Engel and Grossner 2014; Esteva et al. 2010; Hodder 1997; Hodder 2000; Hodder 2003; Lukas, Engel & Mazzucato 2018; Roosevelt et al. 2015; Tringham 2010). Why and how do we make specific choices? And how can we document our choices, i.e. record metadata and paradata, to allow for digitally- mediated scholarship to become better integrated and accepted into archaeological practice? These questions are part of larger challenges and opportunities of digital scholarship in archaeology. Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data122 In the first part of this paper we introduce a historical approach for digitally-mediated archaeology. Derived from interdisciplinary collaboration between historians and historical archaeologists, the approach encourages increased reflexivity and critical analysis of data sources. Just as archaeologists study the position, form, material, and context of an artifact, historians consider the same in scrutinizing documentary resources. Here, we explore how to apply source-side criticism of (sometimes actually historical) analog and digital data. In the second part of this paper, we discuss several examples of translating analog data to geospatial digital data including: (1) converting maps originally generated with alidade and plane table to Geographic Information Systems (GIS) data, (2) converting hand-written field notes into GIS data, (3) integrating multi-source data (i.e. vectorized maps, GNSS, total station, and airborne LiDAR), (4) processing data to generate georeferenced 3D models, and (5) analyzing digital data in different software for scholarly research and interpretation. We summarize the lessons we have learned from our experiences in trans- forming analog data to geospatial digital data, discuss- ing what is lost and what is gained in translation, and then applying what we have learned to provide concrete insights to archaeological practice. We contend that as we transform, integrate, and analyze these data, we are not simply digitizing data but rather we are performing datafication. In other words, we are acquiring new knowl- edge about data collection, documentation, processing, and interpretation, which can lead to new archaeologi- cal questions and methodologies and enhance the nature of archaeological scholarship (Huggett 2017; Kansa and Kansa 2018; Kintigh et al. 2017; Richards-Rissetto and Landau 2015). We advocate an iterative process of ‘trans- lating’ analog and digital data that goes beyond ‘end-prod- ucts’ but rather considers datasets as part of a non-linear process of archaeological investigation that offers new insights to guide transformations of archaeological prac- tice into rich digital scholarship. Archaeological scholarship, whether digital or not, stems from specific research goals. We ask questions that guide our research design from data collection to analysis to dissemination. To situate our discussion, we use a case study from the ancient Maya site of Copán, Honduras, that has specific research goals and questions related to landscape archaeology using a combination of analog and digital data. 2. A Historical Approach for Digitally-mediated Archaeology In anthropology, the so-called postmodern turn of the 1980s encouraged greater awareness of power differ- entials between observed and observer. The concept of culture itself was scrutinized as a reification and tool for “othering” (Abu-Lughod 1991; Clifford and Marcus 1986). Anthropologists began to question themselves, the ethnographies they produced, and the epistemological basis for the scientific hypothetico-deductive-nomological approach. Customs, traditions, and ways of being could only be understood within their appropriate contexts. Given that anthropologists can never actually get inside an informants’ head, postmodernists argued that their books are merely one-sided accounts or fictions, and so they should be treated just as any other literary text (e.g., Salzman 2002). In this vein, post-processual archaeologists attempted to “read the past” or “read material culture” as a way to construct meaning (Hodder 1984; Tilley 1990; Tilley 1993). Because historical archaeology involves both artifacts and texts—material objects as well as writing—postmodern critiques had much to offer. Until then, while written his- tories provided a more privileged position than archaeo- logical data, they were not subjected to the same kinds of rigorous contextual analyses as artifactual studies (Lightfoot 1995; Morrison and Lycett 1997; Stahl 1993). Historical archaeologists began treating texts as arti- facts by more reflexively considering their contexts, how they obtained them (source-side criticism) and how they applied them (subject-side criticism). Of particular importance was source-side criticism, and archaeologists followed the lead of historians in more carefully assessing the authenticity and validity of documentary accounts. W. Raymond Wood (1990) argued that archaeological records, photographs, maps, and the landscape itself be considered ‘documents,’ and thus open to the same kind of source-side criticism as historical texts. He summarizes the historical method in four steps: (1) formulating the problem or research question for which documents are needed, (2) determining which documents are authen- tic (‘external criticism’), (3) determining which details within a document are credible (‘internal criticism’), and (4) organizing all reliable information into a narrative to resolve the research problem. Wood’s (1990) first step of formulating a research ques- tion is encapsulated by archaeology’s turn to ‘problem- based research’ during 1960s processualism, and later on in GIS. For example, Lock and Stančič (1995: xiv) stressed that it is not the specific mathematical procedures them- selves that will be the future of innovative research with GIS but rather “the underlying archaeological approaches and questions determining their use.” Thus, as in dirt archaeology, a preconfigured research question is also a necessary starting point for digital archaeology. Wood’s (1990) second step of external criticism involves assess- ing a document itself, while his third step, internal criti- cism, addresses the document’s specific contents and meaning. To perform external criticism, one must focus on the author and date and obtain the original version rather than a copy. Next, the researcher must separate the content of the document into eyewitness accounts at the moment versus descriptions written by another indi- vidual or later. Most important in evaluating credibility is temporal proximity to the event; next is considera- tion of potential distortion due to the intended purpose and audience of the document; last involves addressing the competency and expertise of the writer and whether there is independent corroboration (Wood 1990, 89). Also important for our purposes is Wood’s admonition to Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data 123 carefully check all translations and their meaning particu- lar to that time and place (e.g. a ‘lot’ number at Copan in 1979 meant something different than in 2013). In relation to maps, he recommends some knowledge on the history of cartography and mapmaking, awareness of the ‘silent updating’ of existing maps, how particular maps were made (e.g. using a compass or astrolabe), what the partic- ular surveyor thought was worthwhile to depict, and the geography of the area in question. In the sections below, we take Wood’s historical approach and apply source-side criticism to text, maps, and 3D models. 3. Geospatial Data: What’s the Big Deal? Archaeology is all about location. Provenience is essential across scales. The more we know about location, the greater potential for more informed and granular inter- pretations. Archaeologists began to employ GIS originally for data management and not long after for spatial analy- sis (Connolly and Lake 2006; Wheatley and Gillings 2002). GIS revolutionized the way archaeologists deal with spa- tial data, and the question as to the magnitude of its impact on archaeological theory is still debated (Howey and Brouwer Burg 2017; Richards-Rissetto 2017b). Never- theless, GIS brought greater awareness to the potential of geospatial data for archaeological studies. No longer would our maps be aligned to site-scale coordinate sys- tems based solely on an arbitrary (0, 0) origin. Rather, our site data could be tied to real-world coordinates allowing us to overlay multiple layers of data such as geology, geo- morphology, and land cover, and importantly for land- scape archaeology, tied to a much larger area with greater precision allowing new types of analyses. Today, many archaeologists have GNSS to acquire data points for not only site location but millimeter-level geospatial data of intra-site features through integrating a variety of digital tools (e.g. total station, laser scanning, and photogrammetry). Others have legacy data from ear- lier surveys, excavations, and analysis (Allison 2008; Clarke 2015; Faniel et al. 2013; Kansa and Kansa 2018; Ullah 2015; Witcher 2008), which provide data that are ‘lost’ due to the destructive nature of excavation, urbanization, agri- culture, looting, taphonomic processes, natural disasters, and more (e.g. Gruen, Remondino & Zhang 2004). These analog data provide a rich source of information that can be converted to and subsequently integrated with digital data to generate not only new data, but to lead to new forms of archaeological practice and scholarship (Faniel et al. 2013; Gunnarsson 2018; Tringham 2010; Wells et al. 2014; Wylie 2017). The use of digital geospatial data has revolutionized the practice of archaeology, but archaeolo- gists must still be vigilant of its origins and context (Ullah 2015). 4. Methods, Lessons, & Reflections: Translating Analog Data to Geospatial Digital Data We apply the above insights on analog/static versus digital/dynamic data and source-side criticism of the historical method to geospatial data in archaeology. We examine five types of data transformation that have been particularly relevant to our own research, and pro- vide a few words on the experience as well as lessons for future practitioners. We illustrate the five transfor- mation types with different categories of data from the ancient city of Copán. Before outlining the five types of data transformation, we provide a brief history on the kinds of analog and digital data that currently exist for Copán. The ancient Maya site of Copán has a long occupation dating back to at least 1800 BCE. Today, it is a UNESCO World Heritage Site in Honduras, but from the fifth to ninth centuries it was the seat of a dynastic kingdom that at its peak governed over 250 square kilometers (Bell et al. 2004; Fash 2001). Excavation dates back to 1834 when Guatemala’s governor, Juan Galindo, mapped part of the site’s core and excavated a tomb in the main civic- ceremonial complex (Fash and Agurcia Fasquelle 1996). Unfortunately these primary data are lost, but in 1869 Stephens and Catherwood—two early explorers of Central America—described, mapped, and created drawings (using a camara lucida) of Copán’s jungle-covered main civic- ceremonial core (Stephens and Catherwood 1841). In the early to mid-nineteenth century, archaeologists began scientific studies of the site that included excavation, architectural drawings, and maps (Maudslay 1889–1902; Morley 1920). Later, in the late 1970s and early 1980s archaeologists carried out a 100% pedestrian and map- ping survey of 24 square kilometers surrounding Copán’s main civic-ceremonial complex (Fash and Long 1983). In the early 1980s two Austrian architects used photogram- metric methods to generate large-scale (1:200) maps of the main civic-ceremonial complex (Hohmann and Vogrin 1982). Additionally, maps from individual excavations are available via unpublished field notes, type-written sum- maries of field notes with penciled-in additions, type- written finalized reports, dissertations, monographs, and other publications available online and in Copán’s onsite archives. These maps along with archival and published data provide a wealth of analog resources to investigate ancient Copán. In following the first step of Wood’s (1990) historical method, we want to be explicit in defining the nature of the problem for which we seek documentary sources. Generally speaking, our case study has two broad research questions: (1) What is the nature of social interaction at Copán in the late eighth to early ninth centuries, just prior to the city’s decline? and (2) How did daily life within Copán’s urban neighborhoods change over time in rela- tion to major political and/or economic events? To exam- ine these questions, we focus on accessibility and visibility within the city of Copán. We ask: who lived in view of royal architecture? Who was visually isolated? Were cer- tain social groups channeled toward specific locations? If so, for what purposes? Additionally, can measures of accessibility and visibility provide data useful for identi- fying neighborhood or other boundaries (Landau 2015; Llobera, Fábrega-Álvarez & Parcero-Oubiña 2011; Llobera 2001, Llobera 2007a, Llobera 2007b; Richards-Rissetto 2010)? In order to address these questions, we need not only geospatial data, but multiple scales of data from Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data124 excavation units to regional surveys, and many of these data are only available in analog formats. Thus, we devel- oped the above mentioned five-step process that includes: (1) converting maps—originally generated with alidade and plane table—to GIS data, (2) translating hand-written field notes into GIS data, (3) integrating multi-source geo- spatial data (e.g. digitized analog data with GNSS data, total station, and airborne LiDAR data), (4) processing GIS and other data to generate georeferenced 3D models, and (5) analyzing geospatial digital data in different software for scholarly research and interpretation. 4.1. Step 1: Digitizing, georeferencing, & attributing paper maps Lessons: While labor-intensive and time-consuming, the process of digitizing, georeferencing, and attributing maps created with differing methods, at multiple scales, and in different languages (English, Spanish, German, and French), and then painstakingly vectorizing them provided new insights and sparked new archaeological questions about the Mahler, or prismatic, method of map- ping Maya sites (Hutson 2012) and Copán’s site typology (Richards-Rissetto 2010, 2012; Richards-Rissetto and Lan- dau 2014; Willey and Leventhal 1979). Our experience was similar to that of Ullah’s (2015) exploration of the minute details and large errors of legacy survey data in Jordan. Here Wood’s (1990) second and third steps apply: the vari- ous paper maps must be subjected to external criticism (are they authentic?) as well as internal criticism (are the details within accurate?). Making such judgments inher- ently involves becoming well acquainted with the context of creation for each map: what we term data intimacy. What were standard cartographic practices in the US, Hondu- ras, Germany, and France in the 1970s? What were the defined problems for which these maps were produced? Which details did the mapmakers include and exclude, and why? Do field notes admit to mistakes, illnesses, land-access issues, etc. that were or were not published in the final map? Did individual field workers have years of experience, or did they learn on the job? Such con- textual questions must be considered in the digitization process. Reflexively as well, the digitizer should explicitly record which maps (external criticism) and which details (internal criticism) were actually digitized or left out, and why (Clarke 2015; Esteva et al. 2010; Hodder 1997; Roosevelt et al. 2017; Ullah 2015; Witcher 2008). While digital implies speed—archaeologists quickly acquire millions of 3D points using a laser scanner—we learned that the best practice is slow practice (Caraher 2016): to take a step back and critically consider the longer term implications of digitization before jumping in. It is criti- cal to examine all mapped analog (and digital) data before georeferencing and vectorizing. Careful examination may help to identify an appropriate grid system and lay out a methodology suited to heterogeneous data (Demján and Dreslerova 2016). In the case study, maps ranged from twenty-four 1 km square plane table and alidade maps at a scale of 1:2000 (Figure 1) (Fash and Long 1983) to 1:200 scale photogram- metric maps of Copán’s civic-ceremonial core (Hohmann and Hohmann-Vogrin 1982), to excavation maps of indi- vidual sites (Maca 2002; Webster 1989). After researching how each of the existing maps were created, we decided to georeference them to the Copán Archaeological Project (PAC 1) site grid (Fash and Long 1983) for several reasons. First, it offered the best tie points for Copán’s heterogene- ous mapped data. It also provided a way to double-check and link attribution because structure and group names are based on grid quadrants with additional data (e.g. site type, number of plazas) available in a separate vol- ume (Fash and Long 1983). Third, the Copán site archives contains a massive collection of original field notes, type-written versions of the field notes, original hand- drawn maps, reports to funding agencies, and final pub- lication drafts. Such sources were helpful in determining how much to rely on particular internal details. For exam- ple, when an archaeologist’s field notes indicated that an area was heavily forested, we noted that archaeological structures and contour lines may be less accurate here than in other areas. Figure 1: Example of 1:2000 scale plane table and adilade map, from Fash and Long (1983) (left) and photogrammetric map at scale 1:200, from Hohmann and Vogrin (1982) (right). Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data 125 Due to fine lines, no color differentiation, and multiple data layers in a single map (e.g. hydrology, structures, contours, modern roads, text), we manually digitized the maps to create georeferenced vector data (i.e. shape- files) to ensure accurate data capture (Richards-Rissetto 2010). Three data layers were vectorized—contour lines, archaeological structures, and hydrology—and attributed with Group name, Structure name, Site Type, and Elevation using data from maps, architectural drawings, and text. Circling back to Wood (1990), it is essential in digital archaeology to capture not only metadata, but paradata (Bentkowska-Kafel, Denard & Baker 2012; Denard 2012); that is, recording the data sources, methods, etc. that inform the choices we make as we digitize, and importantly providing information on any modified data, for example, filling in missing gaps on a map using exca- vation data or architectural drawings. Capturing metadata and paradata is essential in digital archaeology to allow other researchers to reproduce not simply an end-product, but to actually retrace our processes to verify as well as build on such scholarship. In the end, such practice will also facilitate data preservation and access and help for- mulate best practices and standards because it allows data to be readily re-used (Richards-Rissetto and von Schwerin 2017). Another advantage of manual digitization is data intimacy. On-screen tracing of archaeological features by hand simulates traditional hand-drawn mapping prac- tices. Such a process provides familiarity with second-hand data that is lost with automatic vectorization. For exam- ple, in the 1970s, cartographers created a five-level typol- ogy for classifying aboveground architectural remains (Fash and Long 1983; Willey and Leventhal 1979) that archaeologists adopted to represent socioeconomic status. Through manually digitizing and attributing over 3000 structures, we came to question the validity of correlat- ing the typology to social status (Richards-Rissetto 2010). Our suspicions were later supported because there was no spatially statistically significant difference in accessibility between some elite (type 3) and non-elite (type 2) residen- tial groups (Richards-Rissetto 2012; Richards-Rissetto and Landau 2014). Therefore, the slow and tedious practice of on-screen tracing led to the development of a research question about accessibility between people of different socioeconomic status. Results from this study led to a cor- rection in the Copán site typology, changing our under- standing of the nature of status differences and inequality at the ancient city. Applying Wood’s historical method encouraged new research questions that ultimately helped us better answer major anthropological questions. Basic lesson: Although today’s digital archaeology allows rapid and efficient digitization and datafication, we should step back and slow down. Our experiences have shown that developing data intimacy—though some- times hours of painstaking manual digitization—affords greater exploration and reflection on the data. Gaining introspective clarity during the process of digitization and datafication may lead to significant new research findings, previously unconsidered. 4.2. Step 2: Translating archival documents into spatial data & informing the geospatial process Lessons: Archival field reports and hand-written notes are an often untapped resource; however, such data are inconsistent—some investigators write more than others and notes are missing, often unstandardized (between individuals, between projects, and across time), and pro- venience data are hit or miss. Moreover, documents are composed in multiple languages, and at times the writing is illegible (e.g. Clarke 2015, Ullah 2015, Witcher 2008). Nonetheless, after applying Wood’s (1990) criteria to determine credibility, these archival data are worth the effort—they fill in missing pieces and enrich research. For example, they provide attributes for mapped features, rationale for terminology and methods, and ‘lost’ provenience. In the case study, we scanned archival data from the library at the Center for Regional Archaeological Investigations (CRIA) at Copán Ruinas in Honduras. These data include hand-drawn maps and profiles, artifact counts, provenience information, catalog numbers, etc. We scanned the originals as PDF files (for documents) and TIFF files (for images and maps) to address three inter- related goals: for long-term archival purposes, to assist the CRIA in digitization efforts, and to gather more infor- mation on precisely how archaeological structures were interpreted and mapped. While we were reasonably sure that all field notes and reports were authentic due to their curation at the site archives, we combed through these documents for spatial information that we could trans- form into usable geospatial data. We read each source completely to gain a sense of internal validity – does the author contradict themselves? Are peculiar margin com- ments corroborated by other authors within the archives? Once we established validity and accuracy, we georefer- enced and vectorized maps into shapefiles, and populated spreadsheets with attributes linked to the shapefiles. A key challenge was to assign height to the archaeological structures. In the Maya region, survey- ors record the length, width, and height of architectural mounds (i.e. collapsed structures), but do not estimate original structure heights. To estimate structure heights we began by gathering spatial and other relevant data from archived excavation notes, published monographs, and ethnographic data. In particular, annotations and their placement within archival documents provided insights (often lost in the typewritten field reports) via rough sketches and from architectural materials and con- struction techniques (Figure 2) (Tringham 2010). Beyond providing x, y, and z spatial data, these data were integral to developing a GIS method to estimate height based on site type, construction materials, and excavation data (Richards-Rissetto 2010, 2013). Ultimately we estimated height using a trigonometric function, but developing mathematical formulas and an appropriate methodology required a close reading of various analog sources. Basic lesson: Texts should be treated as artifacts them- selves (Lightfoot 1995; Morrison and Lycett 1997; Stahl 1993); we cannot simply take them as fact and incorporate Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data126 them, but rather we need to try to understand the context and purpose of their writing in relation to the writer and historical circumstances. Each document has its own his- torical trajectory and materiality. 4.3. Step 3: Integrating multi-source geospatial data (e.g. Shapefiles, GPS, GNSS, Total Station, LiDAR) Lessons: Combining different geospatial datasets typically fills gaps in archaeological maps, giving a more com- plete picture despite differences in original acquisition or granularity. However, sometimes different datasets overlap. How do we decide which dataset is best, how to combine datasets, or how to give more weight to the ‘better’ dataset? The second and third step of Wood’s (1990) historical method (external and internal criticism) again become important in integrating various data- sets. First, how was each dataset initially produced? For which research questions were the data commissioned to answer? Second, which aspects of each map were more ‘accurate’ in instances of overlap? We conclude that decid- ing which representation is more ‘correct’ or ‘accurate’ should be an iterative process and ideally best accom- plished while in the field, where ground-checking is pos- sible. No one type of data (capture) is necessarily ‘better’ than others, but rather each data type comprises parts— some parts are more useful or accurate than others. In our case study, total station-based mapping in San Lucas revealed what appeared to be a ‘new’ archaeologi- cal group—unmapped in previously published reports. We also ‘lost’ a group that had been previously mapped, which we could not relocate on the ground (similar to Ullah’s [2015] experience). Consulting LiDAR data showed that the originally mapped group had been erroneously placed. While the internal architecture was mapped cor- rectly, the group was placed about 200 m away from its actual location. Therefore, these two groups were one in the same. In another example, while total station data captured low mounds (Landau, Richards-Rissetto & Wolf 2014), it was difficult to differentiate low archaeological mounds (<25cm) from natural topography using airborne LiDAR (von Schwerin et al. 2016). In the process of inte- grating multi-source datasets, we learned that datasets can ‘self-correct,’ but only if we iterate back and forth between them to reveal which bits are more or less accurate. In the end, we create a critical combination of all maps—by applying Wood’s method—that results in improved accu- racy and precision all around. Another example from our case study involves the inte- gration of various datasets with each other and existing geospatial data. Figure 3 is an example from the neighbor- hood of San Lucas at Copán (Landau 2016). It illustrates overlaid data gathered from three different sources– pink (Fash and Long 1983), yellow with black lines (Landau 2016), and a LiDAR-derived landscape (von Schwerin et al. 2016). The Fash and Long (1983) data were collected using alidade and plane table at a time when the Copán Valley was much more sparsely occupied, and this area was likely a cow pasture with low to medium overgrowth. Wolf and Landau re-mapped this architectural group in 2012–14 with several different GNSS units and a total station with prism, and in 2013, the MayaArch3D Project com- missioned LiDAR data (von Schwerin, Richards-Rissetto et al. 2016). In general, Wolf and Landau consulted the Fash and Long (1983) maps while in the field using GNSS Figure 2: Unpublished scanned sketch maps from Copán, Honduras (left), and original field notes from San Lucas, Copán—both illustrating importance of legacy data. (Courtesy: Honduran Institute of Anthropology and History and K. Landau and M. Wolf). Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data 127 receivers and total station with a prism. First we searched for the structures as indicated on the 1983 maps. Keeping these structures in mind with the contemporary land- scape topography, Wolf drew the architectural group as he interpreted it by hand in a notebook; afterward we took a series of three to six points for each structure. Wolf later reconciled these points with his hand-drawn maps (see Figure 2). Afterward, when plotting the 1983 maps together with Wolf’s maps on top of the LiDAR hillshade surface, Landau made further corrections to the Wolf drawing. For example, she modified the edge of the flat- tened area in the northwest corner of Figure 3, to give a more accurate sense of its extent. Another lesson involves careful, critical use of auto- matic digitization tools. While the vector to raster tool in GIS is push-button (not quite black box, but easily non- critically applied), dealing with architecture rather than topography requires different decisions, methods, and tools. For example, what spatial resolution is sufficient? To capture details such as platforms and stairs require high-resolution data; however, generating a 10 cm raster surface for 24 square kilometers or more requires high lev- els of processing power—often not available to individual researchers or archaeologists in developing countries. Additionally, in cases of landscape analysis, these raster- ized architectural data also need to be integrated with the terrain (topographic surface). While LiDAR data are avail- able in some areas, typically they are still unavailable to archaeologists due to high costs and lack of flights, par- ticularly in remote regions. Thus, our options for free or low-cost raster terrain data are limited to lower-resolution datasets such as Shuttle Radar Topography Mission (SRTM) or Advanced Spaceborne Thermal Emission and Refraction Radiometer (ASTER), which unfortunately are not suf- ficient for visibility analyses within urban landscapes such as ancient Maya cities where topography is integral to site layout (Aveni and Hartung 1986; Gagnon et al. 2011; Inomata 2008; Juarez, Salgado-Flores & Hernández 2019; Landau 2015; Richards-Rissetto and Landau 2014). Another option is analog data acquired via instrument mapping and published as paper maps with contour lines. These paper maps typically provide a larger-scale (i.e. higher resolution) terrain than free DEM data (particularly outside of the U.S. and Europe), but following a histori- cal approach, we must step back to critically evaluate the quality of source data. Figure 3: Group 11M-9-11 at the San Lucas Neighborhood, showing overlap between Fash and Long (1983) (pink), Landau (2016) (yellow), and the LiDAR surface (von Schwerin, Richards-Rissetto et al. 2016) (gray). Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data128 Basic Lesson: All sources provide complementary and unique information that together create a more holistic and empirical picture. Digitally-mediated practice neces- sitates and allows us to more deeply interrogate data accuracy and interpretation, particularly through an iterative process. Importantly for archaeological practices, geospatial data integration raises questions such as: Can we identify spatial patterns by examining similarities and differences among analog maps, LiDAR, and excavation data? Can such comparisons help us interpolate older analog maps? How accurate are LiDAR data in particular cultural and environmental contexts? Can we devise algo- rithms to more accurately detect low mounds by ground- checking a stratified sample and comparing topography and vegetation to algorithm-detection accuracy? These questions impact archaeological practice and digital scholarship. 4.4. Step 4: Processing data to generate georeferenced 3D models Lessons: In the past decade, particularly since the advent of out-of-the-box photogrammetry (i.e. Structure from Motion), 3D data have become commonplace in archaeology. However, most 3D data are not born-digital, but rather they are acquired in the field, lab, or museum capturing physical objects and landscapes. These primary data can be instantly georeferenced, or not, depending on available technology and the location of data capture. However, converted analog data such as structure maps introduce new challenges as we move from 2D (vector) to 2.5D (raster) to 3D models (mesh/faces). While we can transform analog maps to GIS vector data and subse- quent raster data, our 3D results are extruded schematic models lacking (slanted) roofs, architectural sculpture, and often platforms and stairs depending on the original map. Transforming 2.5D data into true 3D models usually neces- sitates manual modeling, though procedural modeling is now offering innovative opportunities (Saldana 2015). While directly generating 3D architectural models from GIS (2.5D) data is not ideal, it offers the benefits of con- veying uncertainty and offering a close-reading of data. 3D models, particularly those that are photo-realistic, can lead viewers to false certainty about reconstructions (Kantner 2000). However, abstract models (perhaps aug- mented by transparency or color-coding) portray impor- tant ambiguities (Brunke 2018; Kensek, Dodd & Cipolla 2004; Lengyel and Toulouse 2015). Considering Wood’s (1990) process in reverse, how can we use 3D modeling to indicate instances of uncertainty regarding source authen- ticity and accuracy? Creating data that includes measures of uncertainty would allow future researchers to more eas- ily apply source-side criticism and, ultimately, correction. Moreover, manual 3D modeling leads to data intimacy providing new insights. For example, ambiguities in map- ping, typically not identified in procedural modeling, can be identified and then employed to write scripts to gener- ate empirically-informed procedural models. Yet, we still end up with static, fixed models that represent a single interpretation (i.e. reconstruction). In this scenario, we fail to take advantage of certain digital affordances; that is, we do not take advantage of digital technologies to generate multiple hypothetical 3D models (or simulations) for structures or landscapes. Thus, in the case study we turned to procedural modeling, i.e. ruled-based rapid generation of buildings from GIS data (Richards-Rissetto and Plessing 2015), to generate multiple simulations. We generated 3D models from a spatial database with metadata and the decisions we made (i.e. paradata) stored both as a text document and schematic hierarchy—offering innovative possibilities for digital data storage, accessibility, and reuse (Bentkowska-Kafel, Denard & Baker 2012; Denard 2012; Esteva et al. 2010; Faniel et al. 2013; Lukas, Engel & Mazzucato 2018; Richards-Rissetto and von Schwerin 2017). Additionally, these procedural models provide information to digitally define basic elements and compo- nents of ancient Maya architecture, which scholars have sought to define for over one-hundred years (Andrews 1997; Kubler 1905). Using architectural definitions (Loten and Pendergast 1984), we created rules for elements and components that allow for dynamic modeling rather than static modeling of architecture—this digitally-mediated process facilitates hypothesis generation with empirical underpinnings that are documented in procedural mod- eling scripts (Richards-Rissetto and Plessing 2015). Basic Lesson: In part because of the time input for manual modeling, singular 3D architectural models can mislead viewers to false impressions of the past. Procedural modeling of geospatial data into 3D intro- duces new possibilities because we can create multi- ple simulations based on different data sources. Given that each model displays a different set of conclusions based on the data—and, importantly, includes the source data on which that particular conclusion was based— procedural modeling provides more dynamism to archaeological data. This allows researchers to evaluate multiple different scenarios, and could potentially reveal to the public the complexities of digital 3D archaeologi- cal reconstruction. 4.5. Step 5: Analyzing digital data in different software for scholarly research & interpretation Lessons: While ‘analysis’ occurs in data translation, GIS, 3D modeling software, and VR afford opportunities for knowledge generation via integration, computation, and visualization (Forte and Pescarin 2012; Jones and Levy 2014). Each software offers unique tools and methods that facilitate, enhance, and ultimately change archaeological practice and scholarship. Yet through reflectively iterat- ing between these software, we afford additional new possibilities. While GIS provides tools to convert analog data to geospatial digital formats, its power for scholar- ship resides in its analytical capabilities. Using GIS we can identify spatio-temporal patterns and trends of big and complex data to investigate old questions and hypotheses in alternative ways and propose new lines of inquiry. In the case study, using GIS we developed computational vis- ibility and accessibility approaches across multiple scales to investigate social connectivity among Copán’s different socio-economic groups (Landau 2015; Richards-Rissetto Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data 129 2010; Richards-Rissetto 2012; Richards-Rissetto and Landau 2014). While the GIS offers quantitative measures of potential social connectivity, the technology, based on 2.5D data, does not allow for architectural details such as sculptured facades and arched doorways to be incorporated in the analysis. Thus, aesthetic details such as color and light- ing are missing as well as features impacting visibility, particularly in the communication of messages (Paliou 2014; Paliou 2017; Richards-Rissetto 2017a; Sullivan 2017). Additionally, GIS falls short for phenomenological and other perception-based approaches because it gives a bird’s-eye perspective and lacks a sense of mass and scale (Gillings and Goodrick, 1996; Kwan 2002; Llobera 2012; Rapoport 1988; Richards-Rissetto 2017b; Tilley 1997). To get a closer reading, we need to employ 3D technologies such as 3D modeling software and Virtual Reality (VR). In the case study, we created 3D models of over 700 structures in Copán’s urban core using SketchUp based on GIS data (scanned and georeferenced analog maps), and simulated the landscape between structures to create entire 3D areas to investigate the San Lucas neighbor- hood at Copán (Landau, Richards-Rissetto & Wolf 2014) (Figure 4). The process of creating 3D models was not linear, but rather we iteratively worked back and forth among GIS, LiDAR, and excavation data necessitating a deep exploration of the data as parts but also as a whole. This data intimacy led to new questions about the Mahler method of mapping ancient Maya sites, which records mound heights and not actual structure heights, and thus proves problematic for direct GIS to 3D model conversion. Additionally, Copán’s Site Typology attributes sites from Types 1-5; however, site types refer to the ‘highest’ socio- economic status of the entire group and do not provide information on lower-status occupants or on structure functionality—both of which affect 3D modeling and sub- sequent archaeological interpretations. GIS and 3D models (reality-based and reconstructions) provide source data to create 3D virtual environments of ancient Copán using, for example, VR and procedural modeling. However, other, originally analog, data also provide essential information to create 3D simulations of past landscapes that serve as more than pretty illustra- tions. They enable us to create multiple simulations to interchange data, investigate old hypotheses, and create new interpretations. In these simulations, analog data are just as essential as digital data because they provide information on features that are now lost to degradation, urbanization, excavation, or other processes. Architectural hand-drawings, archival photos, and field notes fill in data gaps. As we go from analog to digital and subsequently integrate datasets, we do not simply convert data, but we translate it—we see anomalies, errors in data, find ‘missing data,’ and think about typologies or classification schemes (e.g. as we standardize attribution). In other words, we acquire data intimacy. With these 3D simulations, we have the ability to convey data ambiguity (Brunke 2018; Kantner 2000; Kensek, Dodd & Cipolla 2004), explore our data in unique, dynamic, and experiential or embodied ways (Forte and Pescarin 2012; Forte and Pietroni 2009; Richards-Rissetto et al. 2012; Richards-Rissetto et al. 2013), and perform landscape-scale analyses that are impossible without going digital. Basic Lesson: In the process of translating analog data to digital form, various technologies including GIS, 3D mode- ling, and VR offer new pathways for data integration, com- putation, and visualization. Although GIS provides a suite of analytical tools, its 2.5D format prevents crucial archi- tectural and landscape features from playing their part in visibility studies, for example. Therefore 3D modeling and VR take over where GIS leaves off: the procedural mod- eling process is predicated on a back-and-forth agreement and decision-making among all datasets, static analog and dynamic digital. The product is more than just a pretty picture because it can show multiple possibilities, re-open preliminary conclusions, and close lasting questions. 5. Discussion—Lessons Learned in Transforming Analog to Geospatial Digital Data Our particular experience working with geospatial data at an archaeological site with over 100 years of excavation history necessitated translating various analog data into digital data. Because we are dealing with raw and derived geospatial data, the steps of the digitization and datafica- tion process are complex; therefore, we aimed to provide some perspective to help guide others in an area for which standards and best practices are emerging. The historical approach we advocate (following Wood 1990) provides a methodology for assessing the origins and accuracy of static analog and born-digital data. In converting different Figure 4: GIS Map of Group 12M-1 from San Lucas neighborhood, Copán (left); 3D SketchUp reconstruction of Group 12M-1 (right). Richards-Rissetto and Landau: Digitally-Mediated Practices of Geospatial Archaeological Data130 sets of paper maps, made by different people in different languages and countries, best practice is to slow down and get a sense for the bigger—and longer term—picture. In using archival documents (e.g. field notes, personal journals, excavation reports), our experience has shown that treating such resources within their context, just as critically as one would treat artifacts, is best practice. Inte- grating multiple and multi-sourced geospatial datasets also requires attention to context, and a back-and-forth iterative process between all data toward a more holistic, more accurate representation. In the creation of 3D virtual environments from 2 or 2.5D data, using procedural modeling and VR allows archaeologists to interrogate and integrate various datasets. Through the process of transforming dispa- rate datasets such as architectural drawings, excavation notes, and archival photos into useful digital data that forms part of the 3D simulations, we develop data inti- macy—identifying key pieces of information that would be lost in automatic methods that simply convert data rather than translate data as required by a close read- ing. Therefore, as we translate analog to digital data, we develop a deeper understanding and appreciation for how the data that are digitized came to be. The digital affords archaeologists greater intimacy with both legacy datasets (analog and digital) as well as derived data and the inter- mediate files created through datafication. Several of our examples above demonstrate the intellectual advantages of data intimacy and slow science (sensu Caraher 2016). We learn about the archaeology we are studying through the act of ‘translating’ these data. Importantly, we invite similar reflection of already digital data because often we have already lost some of the history of these data, especially before metadata or paradata were empha- sized for inclusion. Digital data can give a false sense of accuracy because they are often clean and ready-to-use; likewise, while digital data allow landscape-scale analy- ses that are impossible with analog formats, they impart a distance, disembodied, and masculine god’s eye view. In both cases, the downside is that we often forget the palimpsest from which the data originally derived, as well as the time, material conditions, labor, and small decisions that went into collecting them. In a sense, we experience another black box stemming not only from unknown or poorly understood algorithms, but also from a lack of deep understanding of the data themselves. Postmodern scholars and their skepticism toward eth- nographies have led anthropologists to adopt historical approaches to texts (Morrison and Lycett 1997; Stahl 1993; Wood 1990). Rather than privileging the written word, archaeologists should treat legacy analog data as any other artifact. We should try to understand the con- text and purpose of their writing, the author, and time period. Each document should be interpreted within its own frame. Applying this same perspective to digital archaeology, we conceptualize digitization of analog data not as simply conversion, but rather a continuous process of translation and re-translation (Wylie 2017). To over- come potential losses or confusion in data translation, we advocate a historical approach to digitally-mediated archaeological practice and scholarship that (1) brings awareness to the initial problem or research question for which the data are needed, (2) determines which datasets are authentic (‘external criticism’), (3) identifies which details within a dataset are credible (‘internal criticism’), and (4) organizes all reliable information into a narrative to address the research problem. Beyond advocating a historical approach, we contend that digitally-mediated archaeological practice should not be conceptualized as a chain. We do not acquire knowl- edge linearly; that is, we do not always begin with research (discovery), move to synthesis (integration) and end with practice (application) (Boyer 1990), but rather each step, phase, or component builds on, complements and at times overlaps another. It is time we acknowledge the ‘messi- ness’ of archaeological data and research by devising new conceptual schemes instead of forcing the process into a preconfigured ‘chain.’ In sum, we advocate an iterative pro- cess of ‘translating’ analog and geodigital data that treats data transformation not simply as making ‘end-products,’ but rather as a process that generates intermediate data- sets, i.e. datafication, within the dynamics of archaeologi- cal practice. In this way, as we transform and integrate analog and digital data, we acquire new knowledge about data collection, documentation, processing, and interpre- tation than can lead to new archaeological questions and methodologies and enhance the nature of our scholarship. Data Accessibility Statements The geospatial data are available to researchers upon request via the MayaArch3D and MayaCityBuilder Projects, and with approval from the Instituto Hondureño de Antropología e Historia (IHAH). 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DOI: https://doi. org/10.1177/0162243916671200 How to cite this article: Richards-Rissetto, H and Landau, K. (2019). Digitally-Mediated Practices of Geospatial Archaeological Data: Transformation, Integration, & Interpretation. Journal of Computer Applications in Archaeology, 2(1), pp. 120–135. DOI: https://doi.org/10.5334/jcaa.30 Submitted: 08 January 2019 Accepted: 03 July 2019 Published: 22 August 2019 Copyright: © 2019 The Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/. OPEN ACCESS Journal of Computer Applications in Archaeology, is a peer-reviewed open access journal published by Ubiquity Press.