remote sensing

Developing Soil Maps and a Soil Health Surveillance System

At present no standards, definitions or criteria exist for the assembly, mapping and interpretation of soil legacy data sets, case definitions, soil health and degradation, diagnostic tests, and sampling designs for assessing and monitoring soil condition. It is thus difficult to derive spatially and temporally consistent evaluations of the occurrence of soil degradation, or to provide evidence-based management recommendations for maintaining and improving soil health.

Remote Sensing

AfSIS has produced large-area mosaics of radiometrically calibrated, orthorectified LandsatMSS,TM and ETM+ images. We have also developed SRTM terrain model derivatives (e.g. terrain units, slopes, curvatures, contributing areas, compound topographic and erosion/deposition indices and watershed delineations).

ASTER Global Digital Elevation Model

The release of the ASTER Global Digital Elevation Model (GDEM) was announced by Japan’s Ministry of Economy, Trade and Industry (METI) and NASA on June 29, 2009. The GDEM is distributed as 1 x 1 degree tiles, and has a spatial resolution of 30 m (i.e. equivalent to Landsat TM and ETM+). The AfSIS team is currently compiling the GDEM for the African continent, and will be running analysis and quality checks on this during the course of the next few weeks.

Digital Map of Africaʼs Depleted Soils to Offer Insights Critical for Boosting Food Production

The Bill & Melinda Gates Foundation and Alliance for a Green Revolution in Africa Award US$18 Million to International Center for Tropical Agriculture

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