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首页> 外文期刊>Journal of Geographic Information System >LAN Tool: A GIS Tool for the Improvement of Digital Elevation Models Using Drainage Network Attributes
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LAN Tool: A GIS Tool for the Improvement of Digital Elevation Models Using Drainage Network Attributes

机译：LAN工具：使用排水网络属性改进数字高程模型的GIS工具

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Digital Elevation Models (DEMs) are constructed using altitude point data and various interpolation techniques. The quality and accuracy of DEMs depend on data point density and the interpolation technique used. Usually however, altitude point data especially in plain areas do not provide realistic DEMs, mainly due to errors produced as a result of the interpolation technique, resulting in imprecise topographic representation of the landscape. Such inconsistencies, which are mainly in the form of surface depressions, are especially crucial when DEMs are used as input to hydrologic modeling for impact studies, as they have a negative impact on the model’s performance. This study presents a Geographical Information System (GIS) tool, named LAN (Line Attribute Network), for the improvement of DEM construction techniques and their spatial accuracy, using drainage network attributes. The developed tool does not alter the interpolation technique, but provides higher point density in areas where most DEM problems occur, such as lowland areas or places where artificial topographic features exist. Application of the LAN tool in two test sites showed that it provides considerable DEM improvement.
机译：数字高程模型（DEM）使用海拔数据和各种插值技术构建。 DEM的质量和准确性取决于数据点密度和所使用的插值技术。但是，通常，高海拔地区的数据（尤其是在平原地区）不会提供真实的DEM，这主要是由于插值技术产生的误差所致，导致地形的地形图不精确。这种不一致性（主要表现为表面凹陷）在将DEM用作影响研究的水文模型输入时尤其重要，因为它们会对模型的性能产生负面影响。这项研究提出了一种地理信息系统（GIS）工具，称为LAN（线属性网络），用于利用排水网络属性改善DEM构造技术及其空间精度。开发的工具不会更改插值技术，但会在发生大多数DEM问题的区域（例如低地地区或存在人工地形特征的地方）提供更高的点密度。 LAN工具在两个测试站点中的应用表明，它可以极大地改善DEM。

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