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Proceedings Paper

Calibration of a rangeland biomass model using NOAA-AVHRR 1.1-km data
Author(s): Jane Wellens
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Paper Abstract

The Normalized Difference Vegetation Index (NDVI) has been generated from data from the advanced very high resolution radiometer (AVHRR) for nine rangeland sites in Tunisia. Over one hundred images have been utilized to provide information about the vegetation at approximately monthly intervals for the period September 1983 to August 1992. These data were used to validate a rangeland biomass production model which has been developed for the nine rangeland sites. The model used daily rainfall data, estimates of potential evapotranspiration, and a series of site-specific vegetation parameters in order to estimate actual daily transpiration and an index of growing season yield. Although these outputs are not directly related to NDVI they are functions of the same plant tissues which indices such as the NDVI measure. A significant relationship (p > 0.05) was found between the NDVI and estimates of transpiration for all but one of the sites. The relationship between NDVI, integrated over a growing season, and the model derived yield index were not, however, found to be so strong.

Paper Details

Date Published: 31 January 1995
PDF: 11 pages
Proc. SPIE 2314, Multispectral and Microwave Sensing of Forestry, Hydrology, and Natural Resources, (31 January 1995); doi: 10.1117/12.200752
Show Author Affiliations
Jane Wellens, Univ. of Leicester (United Kingdom)


Published in SPIE Proceedings Vol. 2314:
Multispectral and Microwave Sensing of Forestry, Hydrology, and Natural Resources
Eric Mougin; K. Jon Ranson; James Alan Smith, Editor(s)

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