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首页> 外文会议>Agriculture and Hydrology Applications of Remote Sensing; Proceedings of SPIE-The International Society for Optical Engineering; vol.6411 >Comparison of the Extracted DEMs in Heihe River Upper and Middle Reaches
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Comparison of the Extracted DEMs in Heihe River Upper and Middle Reaches

机译：黑河上游和中游提取DEMs的比较。

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摘要

The Digital Elevation Model (DEM) are terrain elevations at regularly spaced horizontal intervals, i.e., an a grid of regularly spaced elevations. With the development of computing technology, the methods of data acquisition, data storage and data processing speed for DEMs get along well. Heihe river lies in the northwest of China and is a continental river. It roots from snow-ice and disappears in deserts. The drainage area is about 140,000 square kilometers and the river is the main water source for the living. The upper reaches are mountainous and the runoff is very important. The middle reaches are oasis. At present, many hydrological and ecological models are introduced. The catchment basin and stream network data acquired from DEMs are main input data for many surface hydrological models. So the quality and resolution of DEMs are significant. Software ENVI Version 4.2 furnishes with the DEMs Extraction Module. The paper compared several methods for extracting DEMs of the upper reaches. We extracted the elevation data from the ASTER—stereo images with the module and created the DEM. Secondly; we collected the DEM based on the contour map of Heihe river. The comparison of the DEMs quality was carried out between the DEM from the contour map, the DEM extracted by ENVI Version 4.2. To a certain extent, the DEM from Aster imagery can reflect the terrain and be used in hydrological models.
机译：数字高程模型（DEM）是按规则间隔的水平间隔的地形高程，即规则间隔的高程网格。随着计算技术的发展，DEM的数据获取，数据存储和数据处理方法逐渐发展起来。黑河位于中国的西北部，是大陆性河流。它起源于冰雪，并消失在沙漠中。流域面积约14万平方公里，河流是主要的生活水源。上游多山，径流非常重要。中游是绿洲。目前，引入了许多水文和生态模型。从DEM获得的流域盆地和河流网络数据是许多地表水文模型的主要输入数据。因此，DEM的质量和分辨率非常重要。 ENVI 4.2版软件配有DEM提取模块。本文比较了几种提取上游DEM的方法。我们使用该模块从ASTER立体图像中提取了高程数据，并创建了DEM。其次;我们根据黑河等高线图收集了DEM。比较DEM的质量是在轮廓图的DEM与ENVI 4.2版提取的DEM之间进行的。在一定程度上，来自Aster影像的DEM可以反映地形并用于水文模型。

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