The Sahelian belt of West Africa is a region characterized by wide climate variations, which can in turn affect the
survival of local populations especially in rangeland, as happened during the dramatic food crisis in the 70-80s caused by
severe drought. This work has been carried out in the framework of the EU FP7 Geoland2 project as a contribution to the
ECOWAS component (Economic Community Of West African States) of the AMESD (African Monitoring of the
Environment for Sustainable Development) programme with the purpose of establishing the reliability of Dry Matter
Productivity (DMP) developed by Flemish Institute for Technological Research (VITO), a spatial estimation of dry
matter (DM) obtained from remotely sensed data. DMP can be of great help in monitoring savanna pasturelands in a
region characterized by food insecurity and a significant variability of biomass production, linked to climate variations,
which can in turn affect the survival of local populations. The evaluation of DMP was carried out thanks to the Centre de
Suivi Ecologique (CSE) and Action Contre la Fame (ACF), the partners who provided the field biomass measurements.
The paper shows the correlation of DMP with field measurements of herbaceous biomass, and discusses the differences
among the different sites where ground data were collected. The analysis of other environmental variables (land cover,
rainfall), which can be influential on rangeland biomass production, is presented in order to better explain the variance of
field measurements among the different years.