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ISPRS Int. J. Geo-Inf. 2017, 6(8), 234; doi:10.3390/ijgi6080234

Determination of 3D Displacements of Drainage Networks Extracted from Digital Elevation Models (DEMs) Using Linear-Based Methods

Department of Cartographic, Geodetic Engineering and Photogrammetry, University of Jaén, 23071 Jaén, Spain
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Academic Editors: Heejun Chang and Wolfgang Kainz
Received: 15 June 2017 / Revised: 14 July 2017 / Accepted: 2 August 2017 / Published: 4 August 2017
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Abstract

This study describes a new method developed to determine the 3D positional displacements of the drainage networks extracted from Digital Elevation Models (DEMs). The proposed method establishes several stages for data preparation. The displacements are derived by means of linestring-based assessment methods, which can be applied in 2D and 3D. Also, we propose the use of several tools (maps, aggregation of results, new indices, etc.) in order to obtain a wider assessment of positional accuracy, or a time change analysis. This approach supposes a novelty in drainage network studies both in the application of line-based methods and its expansion to 3D data. The method has been tested using a sample of channels extracted from DEMs of two different dates of a zone of about 600 square kilometers using as reference linestrings those extracted from another more recent DEM which had higher spatial accuracy and higher spatial resolution. The results have demonstrated the viability of the method proposed because of the obtaining of 3D displacement vectors, which showed the general and particular behavior of the channels selected. View Full-Text
Keywords: DEMs; channel displacement; drainage networks; positional accuracy; hydrology DEMs; channel displacement; drainage networks; positional accuracy; hydrology
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MDPI and ACS Style

Mozas-Calvache, A.T.; Ureña-Cámara, M.A.; Ariza-López, F.J. Determination of 3D Displacements of Drainage Networks Extracted from Digital Elevation Models (DEMs) Using Linear-Based Methods. ISPRS Int. J. Geo-Inf. 2017, 6, 234.

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