ASTER Global Digital Elevation Model Version 2 - summary of validation results
ASTER Global Digital Elevation Model Version 2 - summary of validation results
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发表时间：
2011
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通讯作者：
T. Tachikawa;M. Kaku;A. Iwasaki;D. Gesch;Michael J. Oimoen;Zhaoxiang Zhang;J. Danielson;T. Krieger-T.-Kri
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作者：
T. Tachikawa;M. Kaku;A. Iwasaki;D. Gesch;Michael J. Oimoen;Zhaoxiang Zhang;J. Danielson;T. Krieger-T.-Kri
美国航天局和日本经济产业省免费向全世界用户发布了一个全球数字高程模型，作为对全球对地观测分布式系统的贡献。这个“版本1”ASTER GDEM（GDEM 1）是从超过120万个基于场景的DEM中编译的，覆盖了83°N和83°S纬度之间的陆地表面。一个美国-日本验证团队评估了GDEM 1的准确性，由20名合作者组成的团队进行了增强。GDEM 1在95%的置信水平下具有约20米的总体精度。该团队还注意到与高纬度地区立体覆盖率差、云污染、水掩蔽问题以及用于从单个基于场景的DEM生成GDEM 1的堆叠过程相关的几个伪影（ASTER GDEM验证团队，2009年）。两项独立的水平分辨率研究估计GDEM 1的有效空间分辨率约为120米。ASTER GDEM的第二个版本（GDEM 2）计划于2011年10月中旬由NASA和METI发布。GDEM 2的改进来自于获取260，000个额外的场景以提高覆盖率，更小的相关内核以产生更高的空间分辨率，以及改进的水掩蔽。与GDEM 1一样，GDEM 2验证由美国和日本合作伙伴执行。垂直精度评估包括将GDEM 2与美国本土（CONUS）上的绝对大地测量基准、美国和日本上的国家高程网格、美国和地球仪周围20个地点上的航天飞机雷达地形使命（SRTM）1弧秒高程网格以及全球空间激光高度计数据进行比较。水平精度评估作为日本和全球SRTM研究的一部分进行，水平分辨率研究在日本和美国进行。每个小组都记录了由于处理改进而导致的GDEM 2中工件的变化。绝对垂直精度研究发现，与美国大陆上的18，000个大地测量控制点相比，GDEM 2平均在-0.20米以内，在95%的置信水平下精度为17米。日本的研究指出，GDEM 2在裸露地区与10米国家高程网格相差-0.7米，在森林地区相差7.4米。同样，CONUS的研究指出，在大多数森林地区，GDEM 2比NED高出1弧秒约8米，在裸露地区，比NED低1米多。…
NASA and the Ministry of Economy, Trade and Industry (METI) of Japan released a Global Digital Elevation Model (GDEM) to users worldwide at no charge as a contribution to the Global Earth Observing System of Systems (GEOSS). This " version 1 " ASTER GDEM (GDEM1) was compiled from over 1.2 million scene-based DEMs covering land surfaces between 83°N and 83°S latitudes. A joint U.S.-Japan validation team assessed the accuracy of the GDEM1, augmented by a team of 20 cooperators. The GDEM1 was found to have an overall accuracy of around 20 meters at the 95% confidence level. The team also noted several artifacts associated with poor stereo coverage at high latitudes, cloud contamination, water masking issues and the stacking process used to produce the GDEM1 from individual scene-based DEMs (ASTER GDEM Validation Team, 2009). Two independent horizontal resolution studies estimated the effective spatial resolution of the GDEM1 to be on the order of 120 meters. A second version of the ASTER GDEM (GDEM2) is scheduled for release by NASA and METI in mid-October, 2011. Improvements in the GDEM2 result from acquiring 260,000 additional scenes to improve coverage, a smaller correlation kernel to yield higher spatial resolution, and improved water masking. As with the GDEM1, the GDEM2 validation was performed by the U.S. and Japanese partners. Vertical accuracy assessments included a comparison of the GDEM2 against absolute geodetic references over the Conterminous US (CONUS), against national elevation grids over the US and Japan, against the Shuttle Radar Topography Mission (SRTM) 1 arc-second elevation grids over the US and 20 sites around the globe, and against space borne laser altimeter data globally. Horizontal accuracy assessments were conducted as part of the Japan and the global SRTM studies, and horizontal resolution studies were conducted in both Japan and the US. Each group documented changes in artifacts in GDEM2 due to processing improvements. The absolute vertical accuracy study found the GDEM2 to be within-0.20 meters on average when compared against 18,000 geodetic control points over the CONUS, with an accuracy of 17 meters at the 95% confidence level. The Japan study noted the GDEM2 differed from the 10-meter national elevation grid by-0.7 meters over bare areas, and by 7.4 meters over forested areas. Similarly, the CONUS study noted the GDEM2 to be about 8 meters above the 1 arc-second NED over most forested areas, and more than a meter below NED over bare areas. …