Comparison of vegetation indices derived from NOAA/AVHRR data for Sahelian crop assessments
| Autor: | Albert Van Dijk, Wayne L. Decker, Susan L. Callis |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Atmospheric Science
Global and Planetary Change Radiometer Solar zenith angle Forestry Enhanced vegetation index Normalized Difference Vegetation Index medicine Environmental science Plant cover Satellite medicine.symptom Vegetation (pathology) Agronomy and Crop Science Communication channel Remote sensing |
| Zdroj: | Agricultural and Forest Meteorology. 46:23-40 |
| ISSN: | 0168-1923 |
| DOI: | 10.1016/0168-1923(89)90110-x |
| Popis: | Channel 1 and Channel 2 reflectance data from the advanced very high resolution radiometers (AVHRR) of the NOAA satellites are becoming an increasingly important source of information for crop condition assessments. Vegetation indices condense satellite spectral data, discriminate vegetation from non-vegetation, and aid in the assessment of crop conditions for a very large range of agricultural and meteorological conditions. In this paper, three vegetation indices (ratio vegetation index, normalized difference vegetation index and difference vegetation index) based on Channel 1 and Channel 2 NOAA/AVHRR data are compared to determine which is most appropriate for operational assessments in the Sahel and Sub-Sahel region of Africa. The indices were tested for the effect of changing solar zenith angle, for discrimination between vegetation and non-vegetation, and for response to the presence of clouds. It was found that similarities among the indices make it possible to use any of the indices for assessments in the Sahel, but using the RVI has slight advantages over the other two indices. |
| Databáze: | OpenAIRE |
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