Comparison of new and existing global digital elevation models: ASTER G-DEM and SRTM-3
Comparison of new and existing global digital elevation models: ASTER G-DEM and SRTM-3
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DOI：
10.1029/2008gl035036
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发表时间：
2008-09-10
影响因子：
5.2
通讯作者：
Lin, Zhou
中科院分区：
文献类型：
--
作者：
Hayakawa, Yuichi S.;Oguchi, Takashi;Lin, Zhou
基于 ASTER 卫星图像的新全球高程数据集 G-DEM 将于 2008 年末发布。G-DEM 将成为最好的免费全球数字高程模型 (DEM)，水平分辨率为 1 角秒。我们将 G-DEM 的质量与目前最好的全球高程数据集 3 角秒 SRTM DEM 进行比较。对日本西部预发布版本的 G-DEM 和 SRTM DEM 的基本地貌参数（高程、坡度和曲率）进行了检查。 G-DEM 的缺失单元数比 SRTM DEM 少，特别是在陡峭的地形中。此外，G-DEM 可以更平滑、更真实地表示低地、山谷、陡坡和山脊，而 SRTM DEM 包括许多局部尖峰和孔洞，并且往往会高估谷底高程并低估山脊高程。 G-DEM 将普遍用于地球科学研究，因为它比 SRTM DEM 具有更高的分辨率、更少的缺失数据和更好的地形表征。
Anew global elevation dataset known as G-DEM, based on the ASTER satellite imagery, will be released in late 2008. G-DEM will be the best freely available global digital elevation model (DEM) at a horizontal resolution of 1 arc second. We assess the quality of G-DEM in comparison with 3-arc-second SRTM DEM, the best current global elevation dataset. Basic geomorphometric parameters ( elevation, slope and curvature) were examined for a pre-release version of G-DEM and SRTM DEM for western Japan. G-DEM has fewer missing cells than SRTM DEM, particularly in steep terrain. Also, G-DEM gives smoother and more realistic representations of lowlands, valleys, steep slopes, and mountain ridges, whereas, SRTM DEM includes many local spikes and holes, and tends to overestimate valley-floor elevation and underestimate ridge elevation. G-DEM will be commonly used in geoscientific studies, because of its higher resolution, fewer missing data, and better topographic representation than SRTM DEM.