has eo found its customers? landslide hazard assessment using gis and multicriteria evaluation...
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Landslide hazard assessment using GIS and multicriteria evaluation techniques in the Tirajana basin, Gran Canaria Island
José I. Barredo, Javier Hervás
Space Applications Institute
European Commission - Joint Research Centre, Ispra, Italy
Alejandro Lomoschitz
Department of Civil Engineering
University of Las Palmas de Gran Canaria, Las Palmas, Spain
Annetty Benavides, Cees van Westen
ITC
Enschede, The Netherlands
Environment and Geo-Information Unit
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Pajonales landslide
Agualatente landslide
Environment and Geo-Information Unit
Barranco de Tirajana basin, Gran Canaria Island
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Environment and Geo-Information Unit
Terrain parameters for GIS-based landslide hazard assessment
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Environment and Geo-Information Unit
GIS & multicriteria evaluation process for landslide hazard assessment
PARAMETERSWEIGHTING
( wj = 1)
PARAMETER CLASSWEIGHTING xij (0-100)
WEIGHTEDLINEAR SUM
STREAMS PROXIMITY
RESERVOIR PROXIMITY
LAND USE CHANGE
LANDSLIDE ACTIVITY
MATERIAL CONSOLIDATION AND FRAGMENTATION
LANDSLIDE HAZARDMAP
ANALYTICALHIERARCHYPROCESS
SLOPE ANGLEPARAMETER LAYERS
n
jijjxwHazard
1
RECODE
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Landslide hazard map of Barranco de Tirajana basin, Gran Canaria Island
Environment and Geo-Information Unit
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Environment and Geo-Information Unit
CONCLUSIONS
GIS assisted by multicriteria evaluation techniques appears suitable for landslide hazard assessment at medium scales in areas where no geotechnical data are available and adequate landslide statistical methods are not feasible
However, some subjectivity is still involved, mainly when assigning weights to the parameter classes