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The "90m" refers to the pixel spacing at the equator. In geographic terms, this corresponds to 3 arc-seconds .

A specialized hydrographic dataset derived from 90m DEMs that maps global river networks, basins, and streamflow with high precision. Key Technical Specifications Download (90M)

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. The "90m" refers to the pixel spacing at the equator