Has EO found its customers? 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

Has EO found its customers? Pajonales landslide Agualatente landslide Environment and Geo-Information Unit Barranco de Tirajana basin, Gran Canaria Island

Has EO found its customers? Environment and Geo-Information Unit Terrain parameters for GIS-based landslide hazard assessment

Has EO found its customers? Environment and Geo-Information Unit GIS & multicriteria evaluation process for landslide hazard assessment PARAMETERS WEIGHTING (  w j = 1) PARAMETER CLASS WEIGHTING x ij (0-100) WEIGHTED LINEAR SUM STREAMS PROXIMITY RESERVOIR PROXIMITY LAND USE CHANGE LANDSLIDE ACTIVITY MATERIAL CONSOLIDATION AND FRAGMENTATION LANDSLIDE HAZARD MAP ANALYTICAL HIERARCHY PROCESS SLOPE ANGLE PARAMETER LAYERS RECODE

Has EO found its customers? Landslide hazard map of Barranco de Tirajana basin, Gran Canaria Island Environment and Geo-Information Unit

Has EO found its customers? 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