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RiskCity Application of GIS for multi-hazard risk assessment in an urban environment

RiskCity Application of GIS for multi-hazard risk assessment in an urban environment. Cees van Westen (ed). Ward & census. High res image. DEM Lidar. Flowchart. Thematic layers: Flood discharges Seismic catalogs Soil and rock data Landslide information Technological information etc.

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RiskCity Application of GIS for multi-hazard risk assessment in an urban environment

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  1. RiskCityApplication of GIS for multi-hazard risk assessment in an urban environment Cees van Westen (ed) ISL 2004

  2. Ward & census High res image DEM Lidar Flowchart Thematic layers: Flood discharges Seismic catalogs Soil and rock data Landslide information Technological information etc. Elements at risk Hazard maps Building Attributes: Urban land use Nr of buildings Height of buildings Nr. people (daytime) Nr. people (nighttime) Landslides Flooding Technological Earthquake Risk = Hazard * Vulnerability * Amount Risk maps Risk curve Landslides Flooding Technological Earthquake ISL 2004

  3. Objective of case study • The objective of this exercise is to demonstrate the concepts of the use of GIS for landslide susceptibility, hazard and risk assessment in an urban setting. • Risk is defined as the probability of harmful consequences, or expected loss (of lives, people injured, property, livelihoods, economic activity disrupted or environment damaged) resulting from interactions between natural or human induced hazards and vulnerable/capable conditions. • Risk assessment with GIS can be done on the basis of the following basic equation: Risk = Hazard * Vulnerability * Amount of elements at risk ISL 2004

  4. ILWIS key features • Import and export of widely used data formats • On-screen and tablet digitizing • Comprehensive set of image processing tools • Orthophoto, image georeferencing, transformation and mosaicing • Advanced modeling and spatial data analysis • 3D visualization with interactive editing for optimal view findings • Rich projection and coordinate system library • Geo-statistical analyses, with Kriging for improved interpolation • Production and visualization of stereo image pairs • Spatial Multiple Criteria Evaluation ISL 2004

  5. Main window ISL 2004

  6. Main structure ISL 2004

  7. Installation Installation instructions The ILWIS binaries are very simple to install. Copy the folder in the downloaded zip file. In this folder there is an ILWIS30.EXE which is the main executable for ILWIS. Double click this file to start ILWIS. IF and ONLY IF the user wants to use the command line COM functionality of ILWIS (make the ILWIS command line available through the Windows COM functionality), the following steps must be taken. The COM registration needs two steps (assume the current directory is the directory with ILWIS30.EXE). These are started from the windows command line (via “Start|Run”, or from a “Command Prompt” window).  regsvr32.exe /s IlwisComProxy.dll  ilwis30.exe -RegServer The option -RegServer needs to be typed exactly as written here. The order in which the commands are executed is not important ISL 2004

  8. The city could be anywhere… ISL 2004

  9. Rotational Block Compression Block Toe Natural Barrier 18 ISL 2004

  10. Example: Tegucigalpa, Honduras ISL 2004

  11. North Landslide Saturday, October 31 Ponded water ISL 2004

  12. Rotational Block Compression Block Toe Natural Barrier 18 ISL 2004

  13. Flood and landslide ISL 2004

  14. Example: Berrinche landslide Airphoto 1:14,000 from 16-March-1975 Airphoto 1:20,000 from 9-February-1990 Airphoto 1:10,000 photos from May 2001 Airphoto 1:25,000 from 1998 ISL 2004

  15. Example: Berrinche landslide Aster image (15 m. spatial resolution) 2005 IRS-P6 (5.6 m. resolution) from 2006 Google Earth (Digital Globe image) 2007 Lidar hillshading image ISL 2004

  16. Input data • Image data • Hazard data • Elements at risk • Height data ISL 2004

  17. HAZARD DATA Landslides ISL 2004

  18. Landslide inventory Statistics of Landslide area Total landslide area ISL 2004

  19. Element at risk data wards mapping units building footprints roads ISL 2004

  20. Display the Urban Landuse as an attribute Pred_landuse Landuse ISL 2004

  21. Final Display with overlay of Ward and road map on High resolution Image ISL 2004

  22. Calculating the number of destroyed buildings Landuse map ISL 2004

  23. Cross table after the cross operation with the raster maps Landuse and building map ISL 2004

  24. Lidar ISL 2004

  25. Altitude Data & Digital Elevation Model After the overlay the topodem map over the contour map with gray representation info Gray representation ISL 2004

  26. Statistics/Histogram of Topo_DEM : Average altitude ISL 2004

  27. Image Stretching Overlay the Lidar DEM over the TopoDEM with default stretch values: default stretch values ISL 2004

  28. Changes seen below after using different stretch options: New stretch values ISL 2004

  29. Filtering Generation of a hillshading image from Lidar map using shadow filter and different stretch values: ISL 2004

  30. Comparison between High Resolution Image and Hillshading Image: High Resolution Image Hillshading Image ISL 2004

  31. Lidar DEM Topo DEM Map Calculation Command Line ISL 2004

  32. Pixel Information Pixel Information ISL 2004

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