Finance

In: Computers and Technology

Submitted By Pheldah
Words 7014
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Journal of Geodesy and Geoinformation

UCTEA Chamber of Surveying and Cadastre Engineers

TMMOB Harita ve Kadastro Mühendisleri Odası

Jeodezi ve Jeoinformasyon Dergisi

Vol.2  Iss.1  pp.19-28  May 2013  Journal No.107  Doi: 10.9733/jgg.120913.2 www.hkmodergi.org

Analysis of surface textures of physiographic features extracted from multiscale digital elevation models via grey level co-occurrence matrix
Dinesh Sathyamoorthy*
Science & Technology Research Institute for Defence (STRIDE), Ministry of Defence, Malaysia

Abstract
Volume: 2 Issue: 1 Page: 19 - 28 May 2013

This paper is aimed at employing grey level co-occurrence matrix (GLCM) to analyse the surface textures of physiographic features extracted from multiscale digital elevation models (DEMs). Four GLCM parameters, energy, contrast, autocorrelation and entropy, are computed for horizontal (0°), vertical (90°) and diagonal (45 and 135°) cell pair orientations. For the respective DEMs and physiographic features, varying patterns are observed in the plots of the GLCM parameters due to varying surface profiles and the changes that occur over the scales. Due to the smoothing of the terrain during multiscaling, the features have increasing values of energy and entropy, and decreasing values of contrast and entropy, indicating decreasing roughness. Mountains have the highest roughness as compared to the other features over the scales, while basins have the lowest roughness. For each parameter, similar trends are observed in the plots for the four different cell pair orientations, indicating similar trends of change of surface texture in the different orientations over the scales. However, varying values are observed for the different orientations, depending on textural uniformity in the corresponding orientations. The results obtained demonstrate that GLCM can be an appropriate tool for…...

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