5 km resolution daily satellite images of the African continent from January 1982 to December 1992 provide Normalized Difference Vegetation Index (NDVI), channel reflectance, brightness temperatures, surface temperature, and cloud probability. The data was processed by the SAI/JRC organization using NOAA AVHRR radiometers onboard satellites NOAA 6, 8, 10, TIROS-N, and NOAA 7, 9, 11.
Use Cases
- Analyze NDVI values for vegetation monitoring and drought assessment across Africa.
- Use channel 4 and 5 brightness temperatures to compute approximate surface temperature via split-window technique.
- Employ channel 2 reflectance and cloud probability images for cloud masking and clear-sky composite creation.
- Track land cover changes over 11 years using daily mosaics in Mercator projection.
- Compare brightness temperatures from channels 3 and 4 for thermal anomaly detection.
Strengths
- Daily temporal resolution for 11 consecutive years (1982-1992).
- 5 km spatial resolution covering the entire African continent.
- Includes six processed data layers: NDVI, reflectance, brightness temperatures, surface temperature, and cloud probability.
Limitations
- Surface temperature estimates are of limited accuracy as they do not account for emissivity variations.
- Data processing and calibration methods are based on coefficients from the late 1980s and early 1990s.
- The dataset ends in 1992, with no guarantee of subsequent updates.
Provenance
- Source
- NOAA AVHRR radiometers onboard satellites NOAA 6, 8, 10, TIROS-N, NOAA 7, 9, 11.
- Collection Method
- Satellite imagery processed by SAI/JRC, including radiance conversion, geometric correction, and mosaic generation.
- Time Range
- January 1982 to December 1992.
- Freshness
- null
- Geography
- African continent.