+ Visit NASA.gov + Advanced Search   + About the Server   + Animation List   + How to Use the Server Previous Animation Next Animation Drought over Western United States (Stills) The product that generated these images is the Normalized Difference Vegetation Index (NDVI), which measures the health of plant life based on their levels of photosynthesis. The NDVI was developed by Compton Tucker, a senior scientist at NASA/Goddard.    NDVI measurments for Arizona during May, 2002. Available formats:   2560 x 1920     TIFF 5 MB   320 x 240         JPEG 16 KB    NDVI measurements for Colorado, Oklahoma, and New Mexico during May, 2002. Available formats:   2560 x 1920     TIFF 8 MB   320 x 240         JPEG 24 KB   160 x 80           PNG 27 KB   80 x 40             PNG   6 KB    NDVI measurements for Utah, Colorado, New Mexico, and Arizona during May, 2002. Available formats:   2560 x 1920     TIFF 8 MB   320 x 240         JPEG 24 KB    NDVI measurements for North and South Dakota during May, 2002. Available formats:   2560 x 1920     TIFF 6 MB   320 x 240         JPEG 18 KB    NDVI measurements for Wyoming, Montana, and the Dakotas during May, 2002. Available formats:   2560 x 1920     TIFF 8 MB   320 x 240         JPEG 22 KB Animation Number: 2493 Animator: Joycelyn Thomson (Lead) Studio: SVS Completed: 2002-07-15 Scientist: Robert Mahoney (NASA/GSFC) Instrument: SPOT-4/VGT-S10 Data Collected: May, 2002 Keywords: DLESE >> Climatology SVS >> Drought DLESE >> Hydrology SVS >> NDVI DLESE >> Natural hazards DLESE >> Soil science This work has been visible on ABC News     Please give credit for this item to NASA/Goddard Space Flight Center Scientific Visualization Studio Back to Top + Privacy Policy and Important Notices + Reproduction Guidelines NASA Official: SVS Contact: Curator: