Shuttle Radar Topography Mission (SRTM GL1) Global 30m Ellipsoidal

<h3>Note: This version of the SRTM GL1 dataset is provided in a WGS84 ellipsoidal vertical datum. This is a non-standard version of the SRTM dataset that is often used for InSAR analysis. This dataset was converted from the orthometric version using the EGM96 geoid model available <a href=\"http://download.osgeo.org/proj/vdatum/egm96_15/\">here</a>. For additional conversion details feel free to <a href=\"http://www.opentopography.org/contact\">contact us</a>.</h3><br> <br> <p>The <a href=\"http://www2.jpl.nasa.gov/srtm/\"title=\"Shuttle Radar Topography Mission (SRTM)\">Shuttle Radar Topography Mission (SRTM)</a> obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000. SRTM is an international project spearheaded by the National Geospatial-Intelligence Agency (NGA) and the National Aeronautics and Space Administration (NASA). </p> <b>Version 3</b>: Elimination of the voids in the NASA SRTM DEM was the primary goal of a project under the NASA MEaSUREs (Making Earth System Data Records for Use in Research Environments) Program. Ultimately this was achieved by filling the voids with elevation data primarily from the ASTER GDEM2 (Global Digital Elevation Model Version 2) and secondarily from the USGS GMTED2010 elevation model or the USGS National Elevation Dataset (NED). NASA SRTM V3.0 three-arc-second data are provided in two forms: (1) by three-by-three averaging of the one arc-second samples, and (2) by extracting the middle sample of those same three-by-three samples. For more information on this dataset visit the <a href=\"https://lpdaac.usgs.gov/products/srtmgl1v003/\">LP DAAC NASA Shuttle Radar Topography Mission Global 1 arc second page</a>.</p><h3>注：本版本的SRTM GL1数据集采用WGS84椭球垂直基准面。这是一款非标准的SRTM数据集，常被用于干涉合成孔径雷达（Interferometric Synthetic Aperture Radar, InSAR）分析。本数据集由正高版本数据通过<a href="http://download.osgeo.org/proj/vdatum/egm96_15/">EGM96大地水准面模型</a>转换得到。如需了解更多转换细节，欢迎<a href="http://www.opentopography.org/contact">联系我们</a>。</h3><br> <br> <p><a href="http://www2.jpl.nasa.gov/srtm/"title="航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission, SRTM）">航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission, SRTM）</a>以近乎全球的尺度获取高程数据，以期构建迄今最完整的地球高分辨率数字地形数据库。该任务搭载经过特殊改装的雷达系统，于2000年2月搭乘“奋进号”航天飞机执行为期11天的飞行任务。SRTM是由美国国家地理空间情报局（National Geospatial-Intelligence Agency, NGA）与美国国家航空航天局（National Aeronautics and Space Administration, NASA）牵头主导的国际合作项目。</p> <b>版本3</b>: 消除NASA SRTM数字高程模型（Digital Elevation Model, DEM）中的空洞，是NASA“为研究环境构建地球系统数据记录”（Making Earth System Data Records for Use in Research Environments, MEaSUREs）计划下属项目的核心目标。最终，研究团队主要借助高级星载热发射和反射辐射计全球数字高程模型版本2（ASTER Global Digital Elevation Model Version 2, ASTER GDEM2）的高程数据填补空洞，次要数据来源为美国地质调查局（United States Geological Survey, USGS）的GMTED2010高程模型或美国地质调查局国家高程数据集（National Elevation Dataset, NED）。NASA SRTM V3.0的3弧秒数据提供两种分发形式：(1) 对1弧秒采样数据进行3×3平均运算；(2) 提取上述3×3采样数据的中心像素。如需了解本数据集的更多信息，请访问<a href="https://lpdaac.usgs.gov/products/srtmgl1v003/">LP DAAC NASA SRTM GL1 V003页面</a>。</p>