AMMA project

In the frame of AMMA (African Monsoon Multi-disciplinary Analysis) project, Postel customise existing NDVI products in order to standardize them in terms of projection, spatial resolution, and area coverage, and to make them easier to use by modellers community. Consequently, customisation consists in resampling products on pre-defined grids, and extracting areas of interest, which are :
-  West Africa : from 25°W to 25°E, from 5°S to 20°N
-  Atlantic : from 60°W to 40°E, from 35°S to 35°N

Postel a generated customized NDVI products, which can be downloaded with their readme files. These products are :
-  monthly AVHRR NDVI (1981-2001) from PATHFINDER AVHRR Land (PAL), provided by Boston University, resampled on a regular grid at 0.25° resolution over "Atlantic" area.
-  10-day POLDER-1 (1996-1997) and POLDER-2 (2003) NDVI, resampled on a regular grid at 0.05° resolution over "West Africa" area.

Furthermore, Postel produces an NDVI from the daily spectral directional albedos derived from SEVIRI/MSG data, provided by the Institute of Meteorology of Portugal in charge of the Land Surface Analysis (LSA) SAF.

Animation of daily NDVI derived from MSG/SEVIRI data over West Africa for the year 2007. (GIF)
Daily NDVI derived from SEVIRI/MSG data over West Africa, 2007.

This NDVI can be downloaded with a readme file. It is available from September 2005, and it covers the West Africa area with a regular grid of 0.05° of resolution.

All these products are also available through the AMMASAT database, in NetCDF format.