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ISLSCP Initiative II Home General Data Overview Vegetation Data Overview |
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Vegetation Data
The Fourier-Adjusted, Sensor and Solar zenith angle corrected, Interpolated, Reconstructed (FASIR) adjusted Normalized Difference Vegetation Index (NDVI) data sets were generated to provide a 17-year, satellite record of monthly changes in the photosynthetic activity of terrestrial vegetation. FASIR-NDVI data are also used in climate models and biogeochemical models to calculate photosynthesis, the exchange of CO2 between the atmosphere and the land surface, land-surface evapotranspiration and the absorption and release of energy by the land surface. FASIR adjustments concentrated on reducing NDVI variations arising from atmospheric, calibration, view and illumination geometries and other effects not related to actual vegetation change. FASIR NDVI was also generated to provide inputs for computing a 17-year time series of associated biophysical parameters, provided as a separate data set in this data collection. The production of the FASIR NDVI data set and its associated biophysical parameters was funded by NASA's Land Surface Hydrology program and the Higher Education Funding Council for Wales (HEFCW) as a core component of the International Satellite Land Surface Climatology Project (ISLSCP) Initiative II Data Collection. Click here to see a movie of FASIR NDVI data.
Data Provider: Sietse O. Los
 Data Files (ISLSCP II Disc #1) |
 Data Set Documentation |
 Image Viewing Tutorial |
The files can be decompressed using the PKZip program. Each file contains ASCII text. The file format consists of numerical fields of varying length, which are delimited by a single space and arranged in columns and rows. All values in these files are written as real numbers. Water bodies are assigned the value of -99 while missing data over land are assigned the value of -88, and permanent ice is -77. The files at different spatial resolutions each contain the following numbers of columns and rows; 1 degree (1d), 360 columns by 180 rows: 1/2 degree (hd), 720 columns by 360 rows: 1/4 degree (qd), 1440 columns by 720 rows. Each file is named based on the month and year of the data.
Example: fasir_ndvi413_1d_19900900.asc is the FASIR-NDVI from September 1990.
The data are structured so that the upperleft corner of the first pixel is located at 90 North latitude and 180 West longitude.
Related Pages:
ISLSCP Initiative II Home
General Data Overview
Vegetation Data Overview
FASIR NDVI Monthly
Revision Date: October 20, 2004