* Corresponding author. Abstract – The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas...

Remote sensing multi-decadal time-series provide important information for analysing long-term environmental change. The Advanced Very High Resolution Radiometer (AVHRR) has been providing data since the early 1980s. Normalised Difference Vegetation Index (NDVI) derived thereof can be used monitoring vegetation conditions. This study presents novel TIMELINE NDVI product, which provides a consis...

The Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA Earth Observing System satellites Terra and Aqua include infrared bands that are designed for the accurate measurement of sea-surface temperature (SST). In addition to the conventional ‘split-window’ bands in the 10-12 μm atmospheric window (similar in spectral properties to the corresponding channels of the heritage instrume...

The operational service for algal bloom monitoring at NERSC is primarily based on NOAA AVHRR and SeaWiFS optical data. The service has shown very useful in several occasions since 1998 while severe and harmful blooms of the algae Chattonella sp. were reported from the North Sea off the coast of Denmark. Early detection and mapping of the extent and concentrations of the blooms were achieved. Ho...

Mit Hilfe von Fernerkundung und zusätzlichen Hilfsdaten sind frühzeitige und objektive Ernteprognosen deutlich vor der Ernte möglich. Dies wurde am Beispiel Braugerste für 2 Regionen in Südwest-Deutschland gezeigt. Demnach können Vorhersagen für Flächenerträge von Braugerste (Sommergerste) bereits 3 – 6 Wochen vor der Ernte vorliegen. Die Prognosefehler, welche abhängig vom Prognosezeitpunkt si...

• First long-term global evaluation of the surface reflectance record from AVHRR. Overall performance close to proposed specification 0.071 ? + 0.0071. No significant variations between seasons. Largest uncertainties found over forest classes. Strong correlations band errors barren and sparsely vegetated areas. The data (LTDR) Advanced Very High-Resolution Radiometer (AVHRR) provides daily with...

Atmospheric dust loadings have a significant influence on global climate by affecting air temperatures through the absorption and scattering of solar radiation. Many dryland basins are significant sources of aeolian dust, but our knowledge of how dust emissions from these systems are affected by ephemeral wetting events is either limited or poor. This research uses synergistic data sets (Total ...