Evaluation of the use high resolution satellite imagery to map slope instability in a tropical environment: St. Thomas, Jamaica

Hdl Handle:
http://hdl.handle.net/10034/345147
Title:
Evaluation of the use high resolution satellite imagery to map slope instability in a tropical environment: St. Thomas, Jamaica
Authors:
Miller, Servel ( 0000-0002-3979-8510 ) ; Leszczyńska, Małgorzata
Abstract:
Landslides are a major natural hazard in Jamaica, and have resulted in loss of life, major economic losses, social disruption and damage to public and private properties. There is a need to delineate areas that are prone to slope instability in order to mitigate their effects. The first and most important stage for the creation of a landslide risk maps is the collection of accurate landslide data in a timely manner. However the type of terrain makes landslide mapping particularly difficult. Aerial Photographs have proven to be an effective way of mapping landslides but acquiring new photographs to map recent landslides is very expensive. High resolution satellite imagery were evaluated for their effectiveness in delineating landslides. The landslides on a whole had no distinctive spectral property; hence no one classification technique could be used to identify them. This research developed integrative methods utilising a combination of: edge enhancement to delineate the scarps area; Wetness Index to identify back titling blocks and debris flow lobes where moisture is higher; shape classification (to distinguish from e.g. ground cleared for agriculture); and slope curvature to map scarps. The information from the image classification was combined in a GIS and automated to determine the probability of the presence and or absence of a landslides. Data derived was validated against detailed field mapping at a scale of 1:5000. For more recent landslides, the modelling proved to be effective, accurately identifying 91% of the landslide both in terms of the location and extent. For the older landslides Pre 2000) the mapping was less effective, with misclassification as high as 24% particularly for smaller landslides. However, the use of these imagery does have great potential as they prove useful for mapping new landslides quickly and efficiently after landslide disaster and are much cheaper and quicker to acquire.
Affiliation:
University of Chester ; University of Warmia and Mazury in Olsztyn
Citation:
Published conference presentation given at 9th International Conference on Environmental Engineering, 22–23 May 2014, Vilnius, Lithuania
Publisher:
Vilnius Gediminas Technical University Press Technika
Publication Date:
May-2014
URI:
http://hdl.handle.net/10034/345147
DOI:
10.3846/enviro.2014.229
Additional Links:
http://leidykla.vgtu.lt/conferences/ENVIRO_2014/Abstracts/5/229.html
Type:
Article; Meetings and Proceedings
Language:
en
EISSN:
2029-7092
ISBN:
9786094576904
Appears in Collections:
Geography and Development Studies

Full metadata record

DC FieldValue Language
dc.contributor.authorMiller, Servelen
dc.contributor.authorLeszczyńska, Małgorzataen
dc.date.accessioned2015-02-24T14:27:51Zen
dc.date.available2015-02-24T14:27:51Zen
dc.date.issued2014-05en
dc.identifier.citationPublished conference presentation given at 9th International Conference on Environmental Engineering, 22–23 May 2014, Vilnius, Lithuaniaen
dc.identifier.isbn9786094576904en
dc.identifier.doi10.3846/enviro.2014.229en
dc.identifier.urihttp://hdl.handle.net/10034/345147en
dc.description.abstractLandslides are a major natural hazard in Jamaica, and have resulted in loss of life, major economic losses, social disruption and damage to public and private properties. There is a need to delineate areas that are prone to slope instability in order to mitigate their effects. The first and most important stage for the creation of a landslide risk maps is the collection of accurate landslide data in a timely manner. However the type of terrain makes landslide mapping particularly difficult. Aerial Photographs have proven to be an effective way of mapping landslides but acquiring new photographs to map recent landslides is very expensive. High resolution satellite imagery were evaluated for their effectiveness in delineating landslides. The landslides on a whole had no distinctive spectral property; hence no one classification technique could be used to identify them. This research developed integrative methods utilising a combination of: edge enhancement to delineate the scarps area; Wetness Index to identify back titling blocks and debris flow lobes where moisture is higher; shape classification (to distinguish from e.g. ground cleared for agriculture); and slope curvature to map scarps. The information from the image classification was combined in a GIS and automated to determine the probability of the presence and or absence of a landslides. Data derived was validated against detailed field mapping at a scale of 1:5000. For more recent landslides, the modelling proved to be effective, accurately identifying 91% of the landslide both in terms of the location and extent. For the older landslides Pre 2000) the mapping was less effective, with misclassification as high as 24% particularly for smaller landslides. However, the use of these imagery does have great potential as they prove useful for mapping new landslides quickly and efficiently after landslide disaster and are much cheaper and quicker to acquire.en
dc.language.isoenen
dc.publisherVilnius Gediminas Technical University Press Technikaen
dc.relation.urlhttp://leidykla.vgtu.lt/conferences/ENVIRO_2014/Abstracts/5/229.htmlen
dc.subjectlandslide risk mapsen
dc.subjectnatural hazarden
dc.titleEvaluation of the use high resolution satellite imagery to map slope instability in a tropical environment: St. Thomas, Jamaicaen
dc.typeArticleen
dc.typeMeetings and Proceedingsen
dc.identifier.eissn2029-7092en
dc.contributor.departmentUniversity of Chester ; University of Warmia and Mazury in Olsztynen
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