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Effects of analytical window and resolution on topographic relief derived using digital elevation models

机译：使用数字高程模型得出的分析窗口和分辨率对地形起伏的影响

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摘要

Relief has been used as an index to quantify the vertical dimension of topography in landscape evolution studies. However, potential impacts of analytical window and resolution of digital elevation models (DEMs) were seldom addressed. Here, three relief parameters (fixed-area local relief, watershed relief, and watershed mean local relief) were examined for three topographic regions (relatively flat loess-till plains in northern Missouri, hilly karst topography in southern Missouri, and a mountainous topography in western Washington) using DEMs of 30-m (USGS NED), 90-m (SRTM), and 1-km (GTOPO30), which are commonly applied in landscape evolution studies. Results indicate that both fixed-area and watershed mean local reliefs are strongly affected by the size of the analytical window, whereas watershed relief is relatively stable. The correlation between watershed relief and watershed mean local relief is affected by the edge effect in determining watershed mean local relief, especially for small watersheds. The comparisons between relief parameters derived from these three resolution DEMs indicate <5% difference between 30- and 90-m DEMs, but >15% difference between 30-m and 1-km DEMs. The relatively large disparity may affect the suitability of using the 1-km GTOPO30 DEM in relief determination.
机译：在景观演变研究中，救济已被用作量化地形垂直尺寸的指标。但是，很少讨论分析窗口和数字高程模型（DEM）分辨率的潜在影响。在这里，对三个地形区域（密苏里州北部相对平坦的黄土耕地，密苏里州南部的丘陵喀斯特地形和密苏里州的山区地形）的三个地形参数（固定区域局部地形，分水岭地形和分水岭平均局部地形）进行了检查。使用30米（USGS NED），90米（SRTM）和1公里（GTOPO30）的DEM，这些DEM通常用于景观演化研究中。结果表明，固定区域和分水岭的平均地势都会受到分析窗口大小的强烈影响，而分水岭的地势则相对稳定。在确定集水区平均局部起伏时，尤其是对于小集水区，边缘效应会影响集水区起伏与平均集水区之间的相关性。从这三个分辨率DEM得出的浮雕参数之间的比较表明，30 m和90 m DEM之间的差异小于5％，而30 m和1 km DEM之间的差异大于15％。相对较大的差异可能会影响在救济确定中使用1公里GTOPO30 DEM的适用性。

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