id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_rqbzjzpsbfgpdlpwghvq4ol53m	Magnus Gålfalk	Technical note: A simple approach for efficient collection of field reference data for calibrating remote sensing mapping of northern wetlands	2018.0	12	.pdf	application/pdf	4267	337	63	The calibration and validation of remote sensing land cover products is highly dependent on accurate field reference Ground-based reference data for fractional land cover mapping can be acquired using traditional methods, such as visual perspective when calculating areas (to speed up the development of a global land cover reference database, we can do the • 3-4 close-up images of common surface cover in the plot (e.g. typical vegetation). Using a distortion-corrected calibration image, we developed a model of the ground geometry by projecting and fitting a 10 x horizontal image size), 𝑋 the horizontal ground distance, and ℎ𝑐𝑎𝑙𝑖𝑏 and ℎ𝑖𝑚𝑔 the camera heights in the calibration and field In this study we used six different land cover types of relevance for CH4 regulation: graminoids, water, shrubs, dry moss, wet M.: Ground reference data error and the mis-estimation of the area of land cover change as a function of its 	./cache/work_rqbzjzpsbfgpdlpwghvq4ol53m.pdf	./txt/work_rqbzjzpsbfgpdlpwghvq4ol53m.txt