Digital elevation data for Madagascar from CIATs SRTM 90m Digital Elevation Database v4.1. The original USGS/NASA SRTM data was provided in cells of approximately 90m x 90m, which has been processed to fill no-data cells and aggregated to 1km x 1km cells by CIAT [1].

Reference: [1] Jarvis, A., H.I. Reuter, A. Nelson, E. Guevara, 2008, Hole-filled SRTM for the globe Version 4, available from the CGIAR-CSI SRTM 90m Database (http://srtm.csi.cgiar.org)