The ValleyMorph Tool: An automated extraction tool for transverse topographic symmetry (T-) factor and valley width to valley height (Vf-) ratio

In tectonically active regions on Earth, shallow-crustal deformation associated with seismic hazards may pose a threat to human life and property. The study of landform development, such as analysis of the valley width to valley height ratio (Vf-ratio) and the Transverse Topographic Symmetry Factor...

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Vydané v:Computers & geosciences Ročník 70; s. 154 - 163
Hlavní autori: Daxberger, Heidi, Dalumpines, Ron, Scott, Darren M., Riller, Ulrich
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Ltd 01.09.2014
Predmet:
Andes region
ArcGIS
Automated data extraction
automation
computer software
computers
deformation
digital elevation models
Extraction
Geographic information systems
geophysics
GIS
humans
landforms
Mathematical models
Python
remote sensing
Satellite navigation systems
Symmetry
tectonics
topography
Transverse topographic symmetry factor
user interface
Valley shape ratio
Valleys
Watersheds
Andes region
ArcGIS
GIS
Transverse topographic symmetry factor
Valley shape ratio
Automated data extraction
Python
ISSN:0098-3004, 1873-7803
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Popis
Shrnutí:In tectonically active regions on Earth, shallow-crustal deformation associated with seismic hazards may pose a threat to human life and property. The study of landform development, such as analysis of the valley width to valley height ratio (Vf-ratio) and the Transverse Topographic Symmetry Factor (T-factor), delineating drainage basin symmetry, can be used as a relative measure of tectonic activity along fault-bound mountain fronts. The fast evolution of digital elevation models (DEM) provides an ideal base for remotely-sensed tectonomorphic studies of large areas using Geographical Information Systems (GIS). However, a manual extraction of the above mentioned morphologic parameters may be tedious and very time consuming. Moreover, basic GIS software suites do not provide the necessary built-in functions. Therefore, we present a newly developed, Python based, ESRI ArcGIS compatible tool and stand-alone script, the ValleyMorph Tool. This tool facilitates an automated extraction of the Vf-ratio and the T-factor data for large regions. Using a digital elevation raster and watershed polygon files as input, the tool provides output in the form of several ArcGIS data tables and shapefiles, ideal for further data manipulation and computation. This coding enables an easy application among the ArcGIS user community and code conversion to earlier ArcGIS versions. The ValleyMorph Tool is easy to use due to a simple graphical user interface. The tool is tested for the southern Central Andes using a total of 3366 watersheds. •We present a Python-based ESRI ArcGIS compatible tool, the ValleyMorph Tool, and stand-alone script.•The tool facilitates an automated extraction of the Vf ratio and the T-factor for large regions.•The tool provides output in the form of several ArcGIS data tables and shapefiles.•The tool is tested for the southern Central Andes using a total of 3366 watersheds.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0098-3004
1873-7803
DOI:10.1016/j.cageo.2014.05.015