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SRTM3和ASTER GDEM是目前为止应用最为普遍的数字高程模型,由于其成像方式和自身分辨率的不同,会使这两种数据产生一定差异。在淮河上游地区展开实验,把基于1∶50000万比例尺的两个DEM数据相比较,分别比较这两种数据在水平位置偏移、高程、坡度、坡向上的差异。结果表明:等高线与河谷都有着明显的偏移;SRTM3与ASTER GDEM数据之间的高程差距在平原地区并不大,而在山区,两者高程差距非常大;SRTM3的坡度相对较为平缓,坡度的大小相对较为集中;ASTER GDEM的坡度相对比较陡峭,坡度大小分布较为分散,SRTM3的坡向分布较为分散,ASTER GDEM的坡向相对而言比较集中。
SRTM3 and ASTER GDEM are by far the most commonly used digital elevation models, and these two kinds of data will be different due to their different imaging methods and their own resolutions. In the upper reaches of the Huaihe River, experiments were carried out to compare the two DEM data based on the 1: 5000000 scale to compare the difference of horizontal displacement, elevation, slope and aspect respectively. The results show that the contour lines and river valleys have a significant deviation. The elevation difference between SRTM3 and ASTER GDEM data is not large in the plain area, but in the mountainous area, the elevation difference between the two is very large. The slope of SRTM3 is relatively gentle, The slope of ASTER GDEM is relatively steep, the slope size distribution is more scattered, the slope distribution of SRTM3 is more dispersed, and the slope of ASTER GDEM is relatively concentrated.