Shuttle Radar Topography Mission 1 Arc-Second Digital Terrain Elevation Data - Global - National Geospatial Data Asset (NGDA)

The Shuttle Radar Topography Mission (SRTM) was a partnership between NASA and the National Geospatial-Intelligence Agency (NGA). Flown aboard the NASA Space Shuttle Endeavour (11-22 February 2000), SRTM fulfilled its mission to map the world in three dimensions. The USGS is under agreement with NGA and NASA's Jet Propulsion Laboratory to distribute SRTM elevation products derived from the C-band radar data. SRTM utilized interferometric C-band Spaceborne Imaging Radar to generate elevation data over 80 percent of the Earth's land surface.

Global SRTM data at a resolution of 1 arc-second have been edited to delineate and flatten water bodies, better define coastlines, remove spikes and wells, and fill small voids. Larger areas of missing data or voids were filled by the NGA using interpolation algorithms in conjunction with other sources of elevation data. The SRTM 1 Arc-Second Global data offer worldwide coverage of void filled data at a resolution of 1 arc-second (30 meters) and provide open distribution of this high-resolution global data set.

航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission，SRTM）是美国国家航空航天局（National Aeronautics and Space Administration，NASA）与美国国家地理空间情报局（National Geospatial-Intelligence Agency，NGA）的合作项目。该任务于2000年2月11日至22日由NASA奋进号航天飞机（Space Shuttle Endeavour）搭载执行，圆满完成全球三维地形测绘的既定任务。美国地质调查局（United States Geological Survey，USGS）已与NGA及NASA喷气推进实验室（Jet Propulsion Laboratory，JPL）签订协议，负责分发基于C波段雷达数据生成的SRTM高程产品。SRTM采用干涉型C波段星载成像雷达，生成了覆盖全球80%陆地表面的高程数据。
分辨率为1角秒的全球SRTM数据已经过系统性编辑处理，包括划定水体范围并平整其高程、优化海岸线轮廓、移除高程尖峰与异常凹陷点，以及填补小型数据空洞。针对大面积数据缺失区域或数据空洞，NGA联合其他高程数据源，通过插值算法完成了填补工作。SRTM 1角秒全球高程数据集实现了全球范围的空洞填补后数据覆盖，分辨率为1角秒（约30米），并支持该高分辨率全球数据集的开放分发。