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1. Global Digital Elevation Model (GTOPO30), 2008

1996. EROS Data Center and Economic and Social Research Institute. Global Digital Elevation Model (GTOPO30) is a raster theme representing elevations worldwide at a resolution of 30 arc seconds (+- 1 Km). These dat... ESRI.

2. Sri Lanka Elevation, 2000

1996. Survey Department of Sri Lanka and Geographical Survey Institute. Sri Lanka Elevation is a Digital Elevation Model representing elevations throughout Sri Lanka at a resolution of 30 arc seconds. This layer is a c... Survey Department of Sri Lanka.