caa a22 4500 467905231 CHVBK 20180406152832.0 cr unu---uuuuu 170328e20060101xx s 000 0 eng 10.1007/s10661-006-1070-0 doi (NATIONALLICENCE)springer-10.1007/s10661-006-1070-0 Precision Measurements from Very-Large Scale Aerial Digital Imagery [Elektronische Daten] [D. Booth, Samuel Cox, Robert Berryman] Managers need measurements and resource managers need the length/width of a variety of items including that of animals, logs, streams, plant canopies, man-made objects, riparian habitat, vegetation patches and other things important in resource monitoring and land inspection. These types of measurements can now be easily and accurately obtained from very large scale aerial (VLSA) imagery having spatial resolutions as fine as 1 millimeter per pixel by using the three new software programs described here. VLSA images have small fields of view and are used for intermittent sampling across extensive landscapes. Pixel-coverage among images is influenced by small changes in airplane altitude above ground level (AGL) and orientation relative to the ground, as well as by changes in topography. These factors affect the object-to-camera distance used for image-resolution calculations. ‘ImageMeasurement' offers a user-friendly interface for accounting for pixel-coverage variation among images by utilizing a database. ‘LaserLOG' records and displays airplane altitude AGL measured from a high frequency laser rangefinder, and displays the vertical velocity. ‘Merge' sorts through large amounts of data generated by LaserLOG and matches precise airplane altitudes with camera trigger times for input to the ImageMeasurement database. We discuss application of these tools, including error estimates. We found measurements from aerial images (collection resolution: 5-26 mm/pixel as projected on the ground) using ImageMeasurement, LaserLOG, and Merge, were accurate to centimeters with an error less than 10%. We recommend these software packages as a means for expanding the utility of aerial image data. Springer Science + Business Media, Inc., 2006 aerial photography nationallicence image nationallicence measurement nationallicence measurement software nationallicence resolution nationallicence riparian measurements nationallicence stream width nationallicence Booth D. USDA-ARS, High Plains Grasslands Research Station, 8408 Hildreth Rd, Cheyenne, Wyoming, USA aut Cox Samuel USDA-ARS, High Plains Grasslands Research Station, 8408 Hildreth Rd, Cheyenne, Wyoming, USA aut Berryman Robert Independent Programming Consultant in Boulder, Colorado, USA aut Environmental Monitoring and Assessment Kluwer Academic Publishers 112/1-3(2006-01-01), 293-307 0167-6369 112:1-3<293 2006 112 10661 https://doi.org/10.1007/s10661-006-1070-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-1070-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Booth D. USDA-ARS, High Plains Grasslands Research Station, 8408 Hildreth Rd, Cheyenne, Wyoming, USA aut NATIONALLICENCE 700 1- Cox Samuel USDA-ARS, High Plains Grasslands Research Station, 8408 Hildreth Rd, Cheyenne, Wyoming, USA aut NATIONALLICENCE 700 1- Berryman Robert Independent Programming Consultant in Boulder, Colorado, USA aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 112/1-3(2006-01-01), 293-307 0167-6369 112:1-3<293 2006 112 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer