LAN Tool: A GIS Tool for the Improvement of Digital Elevation Models Using Drainage Network Attributes

Abstract

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.

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A. Gemitzi and O. Christou, "LAN Tool: A GIS Tool for the Improvement of Digital Elevation Models Using Drainage Network Attributes," Journal of Geographic Information System, Vol. 5 No. 4, 2013, pp. 325-336. doi: 10.4236/jgis.2013.54031.

Conflicts of Interest

The authors declare no conflicts of interest.

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