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NASA Shuttle Radar Topography Mission United States 1 arc second number (SRTMUS1N) provides ancillary metadata files for the SRTM digital elevation model over the United States. The separate '.NUM' files indicate the source of each DEM pixel, specifying whether it came from SRTM radar data or ASTER imagery and the number of data takes or scenes used. This collection was retired in 2014, with its data superseded by the global SRTMGL1N product.
This specific collection (SRTMUS1N) is retired. The data for the United States is now included in the global SRTMGL1N dataset. License is specified as 'other-license-specified' but details are not provided.