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Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.

This study presents a modified approach to delineate and map subsurface geological fractures in karst terrain using two geomorphometric parameters from DEM-derived raster maps of slope and topographic openness. Slope and topographic openness were calculated by first and second derivates of a 25m DEM...

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Main Authors: Ismail , Samy, Mansor, Shattri, Kim Huat, Bujang, Rodsi , Ahmed
Format: Article
Language:English
English
Published: Wuhan University 2010
Online Access:http://psasir.upm.edu.my/id/eprint/17436/1/Topographic%20openness%20algorithm%20for%20characterizing%20geologic%20fractures%20of%20Kuala%20Lumpur%20limestone%20bedrock%20using%20DEM.pdf
http://psasir.upm.edu.my/id/eprint/17436/
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spelling my.upm.eprints.174362015-09-28T00:43:50Z http://psasir.upm.edu.my/id/eprint/17436/ Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM. Ismail , Samy Mansor, Shattri Kim Huat, Bujang Rodsi , Ahmed This study presents a modified approach to delineate and map subsurface geological fractures in karst terrain using two geomorphometric parameters from DEM-derived raster maps of slope and topographic openness. Slope and topographic openness were calculated by first and second derivates of a 25m DEM. These parameters may lead to geologic interpretation of subsurface geologic fractures because the differential surface process of slopes creates landforms with different shape and sizes. The slopes and topograhic openness algorithms perform poorly in the areas of low relief and low slopes. To overcome this problem, a modified method in terms of applying Sobel filter and equalization enhancements to the raster maps of slope and topographic openness maps were applied. The modified method has proven to be better for discrimination of surface signatures of buried geological fractures. This technique has been applied to the Kuala Lumpur limestone bedrock to quantify the spatial patterns of buried geologic fractures. I has been observed that the subsurface geologic fractures have different geomorphometric characteristics and spatial patterns. Their orientations were found to be dominantly in the NW-SE, NE-SW, NNE-SSW, NNW-SSE and WNW-ESE directions. The occupy an area of about 9.243 km2 out of total of limestone, which is approximately 254.319 km2. Understanding the causes of unpredictable piling problems can point to considerable solutions and suggest new methods on the characterizing of the landform and geotechnical engineering problems. This study permits better understanding of the geotechnical engineering setting of Kuala Lumpur limestone bedrock. Wuhan University 2010-10 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/17436/1/Topographic%20openness%20algorithm%20for%20characterizing%20geologic%20fractures%20of%20Kuala%20Lumpur%20limestone%20bedrock%20using%20DEM.pdf Ismail , Samy and Mansor, Shattri and Kim Huat, Bujang and Rodsi , Ahmed (2010) Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM. Journal of Geomatics, 4 (2 ). pp. 61-68. ISSN 1007-3817 English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description This study presents a modified approach to delineate and map subsurface geological fractures in karst terrain using two geomorphometric parameters from DEM-derived raster maps of slope and topographic openness. Slope and topographic openness were calculated by first and second derivates of a 25m DEM. These parameters may lead to geologic interpretation of subsurface geologic fractures because the differential surface process of slopes creates landforms with different shape and sizes. The slopes and topograhic openness algorithms perform poorly in the areas of low relief and low slopes. To overcome this problem, a modified method in terms of applying Sobel filter and equalization enhancements to the raster maps of slope and topographic openness maps were applied. The modified method has proven to be better for discrimination of surface signatures of buried geological fractures. This technique has been applied to the Kuala Lumpur limestone bedrock to quantify the spatial patterns of buried geologic fractures. I has been observed that the subsurface geologic fractures have different geomorphometric characteristics and spatial patterns. Their orientations were found to be dominantly in the NW-SE, NE-SW, NNE-SSW, NNW-SSE and WNW-ESE directions. The occupy an area of about 9.243 km2 out of total of limestone, which is approximately 254.319 km2. Understanding the causes of unpredictable piling problems can point to considerable solutions and suggest new methods on the characterizing of the landform and geotechnical engineering problems. This study permits better understanding of the geotechnical engineering setting of Kuala Lumpur limestone bedrock.
format Article
author Ismail , Samy
Mansor, Shattri
Kim Huat, Bujang
Rodsi , Ahmed
spellingShingle Ismail , Samy
Mansor, Shattri
Kim Huat, Bujang
Rodsi , Ahmed
Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
author_facet Ismail , Samy
Mansor, Shattri
Kim Huat, Bujang
Rodsi , Ahmed
author_sort Ismail , Samy
title Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
title_short Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
title_full Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
title_fullStr Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
title_full_unstemmed Topographic openness algorithm for characterizing geologic fractures of Kuala Lumpur limestone bedrock using DEM.
title_sort topographic openness algorithm for characterizing geologic fractures of kuala lumpur limestone bedrock using dem.
publisher Wuhan University
publishDate 2010
url http://psasir.upm.edu.my/id/eprint/17436/1/Topographic%20openness%20algorithm%20for%20characterizing%20geologic%20fractures%20of%20Kuala%20Lumpur%20limestone%20bedrock%20using%20DEM.pdf
http://psasir.upm.edu.my/id/eprint/17436/
_version_ 1643826516763607040
score 13.211869

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