Earth observation of vegetation status in the Sahelian and Sudanian West Africa: comparison of Terra MODIS and NOAA AVHRR satellite data
- 13 May 2004
- journal article
- research article
- Published by Taylor & Francis Ltd in International Journal of Remote Sensing
- Vol. 25 (9), 1641-1659
- https://doi.org/10.1080/01431160310001598999
Abstract
The first year of Moderate Resolution Imaging Spectroradiometer (MODIS) data are compared with National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR) data for derivation of biophysical variables in Senegal, West Africa. The dynamic range of the two MODIS vegetation indices (VIs)—the continuity vegetation index (CVI) and the enhanced vegetation index (EVI)—is generally much larger than for the NOAA AVHRR normalized difference vegetation index (NDVI) data, indicating the importance of the change in near-infrared wavelength configuration from the NOAA AVHRR sensor to the MODIS sensor. Senegal is characterized by a pronounced gradient in the vegetation density covering a range of agro-climatic zones from arid to humid and it is found that the MODIS CVI values saturate for high VI values while the EVI demonstrates improved sensitivity for high biomass. Compared to NOAA AVHRR the MODIS VIs generally correlate better to the MODIS fraction of absorbed photosynthetically active radiation (fAPAR) absorbed by vegetation canopies and the leaf area index (LAI; the one-sided green leaf area per unit ground area). CVI is found to correlate better to both fAPAR and LAI than is the case for EVI because of the larger dynamic range of the CVI data. This suggests that the problem of background contamination on VIs from soil is not as severe in Senegal as has been found in other semi-arid African areas.Keywords
This publication has 32 references indexed in Scilit:
- Decreases in the antisunward flux of interstellar pickup He+ associated with radial interplanetary magnetic fieldJournal of Geophysical Research, 1998
- Remote estimation of chlorophyll content in higher plant leavesInternational Journal of Remote Sensing, 1997
- Methodology for the estimation of terrestrial net primary production from remotely sensed dataJournal of Geophysical Research: Atmospheres, 1994
- Atmospherically resistant vegetation index (ARVI) for EOS-MODISIEEE Transactions on Geoscience and Remote Sensing, 1992
- Expansion and Contraction of the Sahara Desert from 1980 to 1990Science, 1991
- Radiative transfer in three dimensional leaf canopiesTransport Theory and Statistical Physics, 1990
- Growing period and drought early warning in Africa using satellite dataInternational Journal of Remote Sensing, 1986
- Rainfall and vegetation monitoring in the Savanna Zone of the Democratic Republic of Sudan using the NOAA Advanced Very High Resolution RadiometerInternational Journal of Remote Sensing, 1986
- Characteristics of maximum-value composite images from temporal AVHRR dataInternational Journal of Remote Sensing, 1986
- Satellite remote sensing of primary productionInternational Journal of Remote Sensing, 1986