National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Services Branch Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4010 828-271-4876 ncdc.orders@noaa.gov 8:00 - 6:00 Eastern http://www.ncdc.noaa.gov/oa/about/ncdccontacts.html Unknown remote-sensing image http://www.ncdc.noaa.gov http://www2.ncdc.noaa.gov/docs/gviug/cover.htm The Normalized Difference Vegetation Index (NDVI) is digital data set DS-9615, archived at the National Climatic Data Center (NCDC). The NDVI was computed at the EROS Data Center from weekly visible and near-IR data available from NOAAs Global Vegetation Index product (Kidwell, 1990). The Mercator projected product of NOAA was utilized. The data are available from 55 degrees South to 75 degrees North. Data resolution in the Mercator projection varies from 19.6 Km at the equator to 15 Km at 40 degrees (N or S). The reflectance values of the visible and near -IR data were computed from pre-launch calibration coefficients. The NDVI was computed as: NDVI = (near-IR - visible) / (near-IR + visible). The calibrated visible and near-IR data, and solar zenith angle data included on the GVI product were utilized to screen the NDVI data for cloud contamination and low (less than 15 degrees) solar elevation at the time of data acquisition. Data were also screened for data drops. Two successive weeks of the screened NDVI data were then composited based on the maximum NDVI value of the two weeks. The bi-weekly data were processed for April 1985 through 1989. The start date of the bi-weekly composite intervals was 099 (9 April) in 1985. The start dates in 1986, 1987 and 1988 were 001 (1 January). Processing intervals changed in 1988 on 11 April to a Monday through Sunday weekly cycle. The start date in 1989 was 002 (2 January). To make a wide range of climatic data available to researchers and the public. data set C00285 AVHRR > Advanced Very High Resolution Radiometer DOC/NOAA/NESDIS/NCDC Kidwell, Katherine B., Global Vegetation Index user's guide, U.S. Department ofCommerce, National Oceanic and Atmospheric Administration, National Environmental Satellite Data Information Service, National Climatic Data Center, Satellite Services Division, Camp Springs, MD, 50 p., 1990. http://www2.ncdc.noaa.gov/docs/gviug/cover.htm 19850101 19890131 Ground Condition Complete As Needed -180.0 180.0 75.0 -55.0 DIF Discipline Keyword Thesaurus Earth Sciences > Atmosphere > Meteorology Earth Sciences > Atmosphere > Climatology Earth Sciences > Atmosphere > Weather Earth Science > Land > Agriculture Earth Science > Land > Forestry Earth Science > Ocean > Biological Oceanography > Marine Biology ISO 19115 Topic Category Farming 001 Biota 002 ClimatologyMeteorologyAtmosphere 004 Economy 005 Elevation 006 Environment 007 Oceans 014 GCMD Sciences Keyword Valids EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER EARTH SCIENCE > BIOSPHERE > VEGETATION > BIOMASS EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION INDEX EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > PHOTOSYNTHESIS EARTH SCIENCE > BIOSPHERE > MICROBIOTA > BIOMASS EARTH SCIENCE > BIOSPHERE > MICROBIOTA > CHLOROPHYLL EARTH SCIENCE > BIOSPHERE > VEGETATION > AFFORESTATION/REFORESTATION EARTH SCIENCE > BIOSPHERE > VEGETATION > BIOMASS EARTH SCIENCE > BIOSPHERE > VEGETATION > CHLOROPHYLL EARTH SCIENCE > BIOSPHERE > VEGETATION > PHOTOSYNTHETICALLY ACTIVE RADIATION EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION INDEX EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > AGRICULTURAL EXPANSION EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > DEFORESTATION EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > DESERTIFICATION EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > EUTROPHICATION EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > RECLAMATION/REVEGETATION/RESTORATION EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > REFORESTATION EARTH SCIENCE > HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > LAND SURFACE > LAND USE/LAND COVER > LAND COVER EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN OPTICS > PHOTOSYNTHETICALLY ACTIVE RADIATION EARTH SCIENCE > SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > REFLECTED INFRARED EARTH SCIENCE > SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE RADIANCE GCMD Location Valids Equatorial Mid-latitude Polar GCMD Location Valids Troposphere Land Surface Sea Surface None None Not provided Unknown Completeness information not available. Unknown Unknown Not provided with original documentation. None National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov DS-9615 Disclaimer: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. 20040903 20040903 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998