id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_de7sy5fo2zbehin47kwypccajm	E. Raymond Hunt	Evaluation of Digital Photography from Model Aircraft for Remote Sensing of Crop Biomass and Nitrogen Status	2005.0	20	.pdf	application/pdf	7252	549	63	Hobbyists have been acquiring aerial photography from radiocontrolled model aircraft; we evaluated these very-low-cost, very high-resolution digital photography for Keywords: radio-controlled model aircraft, color imagery, remote sensing, biomass, nutrient status, biomass can be estimated from Leaf Area Index (LAI), both of which can be remotely sensed (Bausch and Duke, 1996; Blackmer et al., 1996b; Daughtry et al., Quilter and Anderson (2000) suggested that aerial photography from radiocontrolled model aircraft can provide very-low-cost, very-high-resolution imagery. We also made further improvements to a fixed-wing model aircraft to test its usefulness as a remote sensing platform for precision agriculture. The original idea was to use colored tarpaulins to calibrate the digital photographs to red, green and blue reflectances Comparison of the Normalized Green–Red Difference Index for five colored tarpaulins between camera digital numbers and weighted spectral reflectances. aircraft and digital cameras as a very-low-cost, very-high-spatial-resolution alternative for remote sensing in precision agriculture.	./cache/work_de7sy5fo2zbehin47kwypccajm.pdf	./txt/work_de7sy5fo2zbehin47kwypccajm.txt