caa a22 4500 467901880 CHVBK 20180406152820.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10661-005-9164-7 doi (NATIONALLICENCE)springer-10.1007/s10661-005-9164-7 Point Sampling Digital Imagery with ‘Samplepoint' [Elektronische Daten] [D. Booth, Samuel Cox, Robert Berryman] Measuring percent occurrence of objects from digital images can save time and expense relative to conventional field measurements. However, the accuracy of image analysis had, until now, not reached the level of the best conventional field measurements. Additionally, most image-analysis software programs require advanced user training to successfully analyze images. Here we present a new software program, ‘SamplePoint,' that provides the user a single-pixel sample point and the ability to view and identify the pixel context. We found SamplePoint to allow accuracy comparable with the most accurate field-methods for ground-cover measurements. Expert use of the program requires minimal training and its ease of use allows rapid measurements from image data. We recommend SamplePoint for calibrating the threshold-detection level of image-analysis software or for making direct measurements of percent occurrence from digital images. Springer Science+Business Media, Inc., 2006 cover measurement nationallicence ground cover nationallicence image analysis nationallicence point frame nationallicence sampling nationallicence Booth D. Rangeland Scientist and Remote Sensing Technician, USDA Agricultural Research Service, High Plains Grasslands Research Station, 8408 Hildreth Rd, 82009, Cheyenne, WY, USA aut Cox Samuel Rangeland Scientist and Remote Sensing Technician, USDA Agricultural Research Service, High Plains Grasslands Research Station, 8408 Hildreth Rd, 82009, Cheyenne, WY, USA aut Berryman Robert Independent Programming Consultant, Boulder, CO, USA aut Environmental Monitoring and Assessment Kluwer Academic Publishers 123/1-3(2006-12-01), 97-108 0167-6369 123:1-3<97 2006 123 10661 https://doi.org/10.1007/s10661-005-9164-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-005-9164-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Booth D. Rangeland Scientist and Remote Sensing Technician, USDA Agricultural Research Service, High Plains Grasslands Research Station, 8408 Hildreth Rd, 82009, Cheyenne, WY, USA aut NATIONALLICENCE 700 1- Cox Samuel Rangeland Scientist and Remote Sensing Technician, USDA Agricultural Research Service, High Plains Grasslands Research Station, 8408 Hildreth Rd, 82009, Cheyenne, WY, USA aut NATIONALLICENCE 700 1- Berryman Robert Independent Programming Consultant, Boulder, CO, USA aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 123/1-3(2006-12-01), 97-108 0167-6369 123:1-3<97 2006 123 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer