GCIP/EOP Land Characterization: NOAA/NESDIS/ORA Land Surface Team GVI Products
Projects:
Summary
The third generation Global Vegetation Index (GVI) weekly composite data are produced operationally by NOAA/NESDIS and includes conversion of counts to reflectances and brightness temperatures using the post-launch calibration and non-linearity correction coefficients. Cloud flags are generated and appended to each map cell. The GVI dataset represents a sample of Global Area Coverage (GAC) observations mapped into 0.144 degree resolution maps in equal-angle projection (Plate Carree). A 7-day composite is a mosaic of observations produced by retaining data for each map cell corresponding to the maximum difference between AVHRR channels 2 and 1. Normalized Difference Vegetation Index (NDVI) is calculated from AVHRR channel 2 and 1 reflectances using the following formula: NDVI = (CH2 - CH1) / (CH2 + CH1)
Data access
- download: avhrr.html
Additional information
Temporal coverage
| Begin datetime | 1996-04-01 00:00:00 |
| End datetime | 2001-09-30 23:59:59 |
Spatial coverage
Map data from IBCSO, IBCAO, and Global Topography.
Maximum (North) Latitude:
50.00,
Minimum (South) Latitude:
20.00
Minimum (West) Longitude:
-120.00,
Maximum (East) Longitude:
-50.00
Primary point of contact information
EOL Data Support <datahelp@eol.ucar.edu>
Additional contact information
- originator: National Climatic Data Center (NCDC), NOAA