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V. Chaplot, F. Darboux, H. Bourennane, S. Leguédois, N. Silvera and K. Phachomphon, “Accuracy of Interpolation Techniques for the Derivation of Digital Elevation Models in Relation to Landform Types and Data Density,” Geomorphology, Vol. 77, No. 1-2, 2006, pp. 126-141. doi:10.1016/j.geomorph.2005.12.010

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

  AUTHORS: Alexandra Gemitzi, Odysseas Christou

  KEYWORDS: Digital Elevation Model (DEM); Geographical Information Systems (GIS); Drainage Network; Spatial Interpolation; Hydrologic Modeling

  JOURNAL NAME: Journal of Geographic Information System, Vol.5 No.4, July 24, 2013

  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.