Journal ArticleDOI
Mean and inter-year variation of growing-season normalized difference vegetation index for the Sahel 1981-1989
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TLDR
In this paper, the mean and coefficient of variation of nine years (1981-1989) of NOAA AVHRR normalized difference vegetation index (NDVI) data for the growing season (July-October) in Africa, north of the equator.Abstract:
Images are presented that show the mean and coefficient of variation of nine years (1981-1989) of NOAA AVHRR normalized difference vegetation index (NDVI) data for the growing season (July-October) in Africa, north of the equator. The variation in the growing season NDVI is represented by the coefficient of variation image that shows the large variation in the Sahelian growing season between years. It is concluded that these images illustrate some aspects of the perspective being brought to regional and continental scale processes by coarse resolution satellite sensors and the potential of these sensors to provide consistent, long-term datasets.read more
Citations
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Journal ArticleDOI
Analysis of Sahelian vegetation dynamics using NOAA-AVHRR NDVI data from 1981–2003
TL;DR: In this article, a 23-year time series of Remotely sensed measurements from NOAA-AVHRR expressed as normalized difference vegetation index (NDVI) have been used for long-term studies of Sahel region.
Journal ArticleDOI
A methodology for surface soil moisture and vegetation optical depth retrieval using the microwave polarization difference index
TL;DR: The methodology uses a radiative transfer model to solve for surface soil moisture and vegetation optical depth simultaneously using a nonlinear iterative optimization procedure and does not require any field observations of soil moisture or canopy biophysical properties for calibration purposes and may be applied to other wavelengths.
Journal ArticleDOI
Can human-induced land degradation be distinguished from the effects of rainfall variability? A case study in South Africa
TL;DR: In this paper, the linear relationship of Log e Rainfall with Net Primary Production (NPP) and NDVI was calculated for every pixel and the RESTREND method showed promising results at a national scale and in the Limpopo Province, where negative trends were often associated with degraded areas in communal lands.
Journal ArticleDOI
The Pathfinder AVHRR land data set: An improved coarse resolution data set for terrestrial monitoring
M. E. James,Satya Kalluri +1 more
TL;DR: A reprocessing of 12 years of global data from the Advanced Very High Resolution Radiometers on board the afternoon-viewing NOAA series satellites (NOAA-7, 9, and 11) is taking place as part of the NASA/NOAA Pathfinder project as discussed by the authors.
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References
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Journal ArticleDOI
Characteristics of maximum-value composite images from temporal AVHRR data
TL;DR: In this paper, satellite data from the Advanced Very High Resolution Radiometer sensor have been processed over several days and combined to produce spatially continuous cloud-free imagery over large areas with sufficient temporal resolution to study green-vegetation dynamics.
Journal ArticleDOI
Investigation of soil influences in AVHRR red and near-infrared vegetation index imagery
Alfredo Huete,Compton J. Tucker +1 more
TL;DR: In this article, the effects of soil optical properties on vegetation index imagery were analyzed with ground-based spectral measurements and both simulated and actual AVHRR data from the NOAA satellites.
Journal ArticleDOI
NOAA-11 AVHRR visible and near-IR inflight calibration
TL;DR: In this article, an inflight calibration method for the NOAA-11 AVHRR visible and near-infrared bands using desert reflectance is discussed, which shows a decrease in sensor systems response of 22 percent and 32 percent for the visible and NIR bands, respectively, relative to the published preflight calibration.
Journal ArticleDOI
The effect of water vapour on the normalized difference vegetation index derived for the Sahelian region from NOAA AVHRR data
TL;DR: The near-infrared channel of the NOAA advanced very high resolution radiometer (AVHRR) contains a water vapor absorption band that affects the determination of the normalized difference vegetation index (NDVI).
Journal ArticleDOI
Cloud-screening for Africa using a geographically and seasonally variable infrared threshold
T. F. Eck,V. L. Kalb +1 more
TL;DR: A spatially variable monthly, infrared cloud-threshold data base has been used to screen cloud-contaminated observations from radiances measured by the NOAA-9 AVHRR over Africa.