A New Method for Automated Measurement of Sand Dune Migration Based on Multi-Temporal LiDAR-Derived Digital Elevation Models

While remote sensing methods have long been used for coastal and desert sand dune studies, few methods have been developed for the automated measurement of dune migration in large dune fields. To overcome a major limitation of an existing method named “pairs of source and target points (PSTP)”, this...

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Vydané v:Remote sensing (Basel, Switzerland) Ročník 13; číslo 16; s. 3084
Hlavní autori: Dong, Pinliang, Xia, Jisheng, Zhong, Ruofei, Zhao, Zhifang, Tan, Shucheng
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Basel MDPI AG 06.08.2021
Predmet:
Angle of repose
Automation
Digital Elevation Models
Dunes
Elevation
Geographic information systems
LiDAR
Methods
New Mexico
Programming languages
Random sampling
Remote sensing
Sand
sand dune migration
Sensitivity analysis
Spatial analysis
Statistical sampling
Toe
toe line tracking
New Mexico
United States > US
ISSN:2072-4292, 2072-4292
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Shrnutí:While remote sensing methods have long been used for coastal and desert sand dune studies, few methods have been developed for the automated measurement of dune migration in large dune fields. To overcome a major limitation of an existing method named “pairs of source and target points (PSTP)”, this paper proposes a toe line tracking (TLT) method for the automated measurement of dune migration rate and direction using multi-temporal digital elevation models (DEM) derived from light detection and ranging (LiDAR) data. Based on a few simple parameters, the TLT method automatically extracts the base level of a dune field and toe lines of individual dunes. The toe line polygons derived from two DEMs are processed using logical operators and other spatial analysis methods implemented in the Python programming language in a geographic information system. By generating thousands of random sampling points along source toe lines, dune migration distances and directions are calculated and saved with the sampling point feature class. The application of the TLT method was demonstrated using multi-temporal LiDAR-derived DEMs for a 9 km by 2.4 km area in the White Sands Dune Field in New Mexico (USA). Dune migration distances and directions for three periods (24 January 2009–26 September 2009, 26 September 2009–6 June 2010, and 24 January 2009–6 January 2010) were calculated. Sensitivity analyses were carried out using different window sizes and toe heights. The results suggest that both PSTP and TLT produce similar sand dune migration rates and directions, but TLT is a more generic method that works for dunes with or without slipfaces that reach the angle of repose.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs13163084