ASTER Global Digital Elevation Model V002

The first Earth Observing System (EOS) satellite called Terra (previously AM-1) was launched on December 18, 1999. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is one of the five state-of-the-art instrument sensor systems on-board Terra (built by METI) with a unique combination of wide spectral coverage and high spatial resolution in the visible near-infrared through shortwave infrared to the thermal infrared regions. Images are acquired in 14 spectral bands using three separate telescopes and sensor systems. These include three visible and near-infrared (VNIR) bands with a spatial resolution of 15 meters (m), six short-wave-infrared (SWIR) bands with a spatial resolution of 30m, and five thermal infrared (TIR) bands that have a spatial resolution of 90 m. VNIR Band3 also is acquired using a backward-looking telescope, thus providing along-track stereo coverage from which high-quality digital elevation models (DEMs) are generated as one of a suite of ASTER standard data products. ASTER DEM standard data products are produced with 30m postings, and have Z accuracies generally between 10 m and 25 m root mean square error (RMSE).The development project of the ASTER Ground Data System (ASTER GDS) began in fiscal year 1994. The ASTER Global DEM (GDEM) was released to the public on June 29, 2009.

首颗地球观测系统（Earth Observing System, EOS）卫星Terra（曾用名AM-1）于1999年12月18日发射升空。先进星载热发射和反射辐射计（Advanced Spaceborne Thermal Emission and Reflection Radiometer, ASTER）是Terra卫星搭载的五套当前最先进的仪器传感器系统之一，由METI研制，具备宽光谱覆盖范围，且在可见光近红外、短波红外至热红外波段均拥有高空间分辨率。该传感器通过三套独立的望远镜与传感器系统获取14个光谱波段的影像，具体包括：3个可见光近红外（Visible and Near-Infrared, VNIR）波段，空间分辨率为15米；6个短波红外（Short-Wave Infrared, SWIR）波段，空间分辨率为30米；以及5个热红外（Thermal Infrared, TIR）波段，空间分辨率为90米。其中VNIR第3波段搭载后视望远镜，可实现沿轨立体覆盖，由此生成的高质量数字高程模型（Digital Elevation Model, DEM）是ASTER标准数据产品套件中的一类。ASTER DEM标准数据产品的格网间距为30米，其高程精度的均方根误差（Root Mean Square Error, RMSE）通常介于10米至25米之间。ASTER地面数据系统（ASTER Ground Data System, ASTER GDS）的开发项目始于1994财年，ASTER全球数字高程模型（ASTER Global DEM, ASTER GDEM）于2009年6月29日向公众发布。