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A more recent global product from the German Aerospace Center (DLR), which offers higher vertical accuracy (often around 1 meter) compared to the older SRTM standards.
These models typically cover Earth's landmasses from pole to pole (TanDEM-X) or between 60°N and 56°S latitudes (SRTM).
The SRTM 90m digital elevation database is primarily used for: 90 m water body map using multi-temporal Landsat images
This is a widely used, "void-filled" version of the original NASA data. It has been processed to remove gaps caused by radar shadows or water bodies, making it more reliable for hydrological and topographical analysis.
Downloads are standardly provided in GeoTIFF or ArcInfo ASCII formats, allowing for easy integration into software like ArcGIS or QGIS. Common Applications
A specialized hydrographic dataset derived from 90m DEMs that maps global river networks, basins, and streamflow with high precision. Key Technical Specifications
The "90m" refers to the pixel spacing at the equator. In geographic terms, this corresponds to 3 arc-seconds .
The most prominent "90m" downloads are available through these major scientific repositories: