International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 RiskCity Exercise 6a: Qualitative risk assessment. Cees van Westen United Nations University – ITC School for Disaster Geo-Information Management International Institute for Geo-Information Science and Earth Observation (ITC) Enschede, The Netherlands Associated Institute of the

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Landslide risk exercise Three approaches will be done: Qualitative landslide risk assessment Semi quantitative Quantitative Input data

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Simple vulnerability assessment Vuln_buildings:=iff(nr_buildings<5,”Low_v”,iff(nr_buildings<25, “Moderate_v”, ”High_v”)) This is of course a large simplification. If more time was available the vulnerability could be better evaluated using Spatial Multi Criteria Evaluation with many more criteria. Mapping units Vulnerability

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Create two dimensional table Creating the two-dimensional table: Make sure to click the create domain button and create the class domain “Risk” with three classes. Note that you can change the order in which they appear by selecting Edit, Manual Sorting in the Domain Editor.

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Qualitative risk assessment Qualitative_risk = Qualitative_risk [Susceptibility,Vulnerability] Vulnerability Susceptibility Two dimensional table

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Results Area Percentage of the area High landslide risk ,92% Moderate landslide risk ,34% Low landslide risk ,69% Undefined area ,05% total ,00%

International Institute for Geo-Information Science and Earth Observation (ITC) ISL 2004 Advanced exercise Low VulnerabilityModerate Vulnerability High Vulnerability why Vac_shrubs Vac_damaged Vac_construction Vac_car River Rec_park Rec_flat_area Pub_cemetery Res_large Rec_stadium Ins_office Ind_industries Comm_shop Comm_market Comm_hotel Comm_business Ind_warehouse Res_multi Res_mod_single Res_squatter Res_small_single Ins_school Pub_electricity Pub_religious Ins_police Pub_cultural Ins_hospital Ind_hazardous Ins_fire High population density Vulnerable age group and high density High change of secondary damage Important cultural value Important for law and order and rescue High population density, important cultural value Important for the medicals emergency Possible technological risk – domino effect Important for the response phase  Improve vulnerability map