Evaluating Change in Rangeland Condition using Multitemporal AVHRR Data and Geographic Information System Analysis |
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| Authors: | Timothy B Minor Judith Lancaster Timothy G Wade James D Wickham Walter Whitford K Bruce Jones |
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| Institution: | (1) Biological Sciences Center, Desert Research Institute, 7010 Dandini Blvd, Reno, Nevada, 89512, U.S.A.;(2) Environmental Systems Division (MD-56), National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, 27711, U.S.A;(3) Characterization Research Division/Office of Research and Development, National Exposure Research Laboratory, U.S. Environmental Protection Agency, Las Vegas, Nevada, 89193, U.S.A |
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| Abstract: | Coarse-scale, multitemporal satellite image data were evaluated as a tool for detecting variation in vegetation productivity, as a potential indicator of change in rangeland condition in the western U.S. The conterminous U.S. Advanced Very High Resolution Radiometer (AVHRR) biweekly composite data set was employed using the six-year time series 1989–1994. Normalized Difference Vegetation Index (NDVI) image bands for the state of New Mexico were imported into a Geographic Information System (GIS) for analysis with other spatial data sets. Averaged NDVI was calculated for each year, and a series of regression analyses were performed using one year as the baseline. Residuals from the regression line indicated 14 significant areas of NDVI change: two with lower NDVI, and 11 with higher NDVI. Rangeland management changes, cross-country military training activities, and increases in irrigated cropland were among the identified causes of change. |
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| Keywords: | GIS multitemporal analysis NDVI rangelandcondition remote sensing |
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