28.pdf - Exercise 1 Using GIS to assess and map...

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1 Exercise 1 – Using GIS to assess and map socioeconomic factors of vulnerability Introduction The focus of exercise is on using GIS to assess and map socioeconomic factors of vulnerability. At the same time, the exercise will also illustrate the role of GIS in developing composite indices of vulnerability to natural hazards at the community level. To develop such composite indices, socioeconomic factors must be combined with physical factors. Therefore, flood hazard zones are included in the exercise to represent the physical component of vulnerability. The exercise is divided into two sections. The first section focuses on the exposure dimension of vulnerability. In this section, data on flood hazard zones and land use (as a factor of socioeconomic vulnerability) in the community of Revere are described. These two types of data are then combined to obtain a map of exposure to extreme storm in the community. The second section of the exercise focuses on the dimension of resistance. In this section, data from United States Bureau of Census are used to assess and map socioeconomic factors of vulnerability. These data are then combined with data on flood hazard zones to obtain a composite index of vulnerability to extreme storm for the community. Assessment of exposure to extreme storm The risk from flooding associated with extreme storms has been determined for the community of Revere by the United States Federal Emergency Management Agency (FEMA). As a part of its National Flood Insurance Program (NFIP), FEMA has developed a Flood Insurance Rate Map (FIRM) for Revere. The FIRM shows areas at different levels of risk from flooding with a focus on areas at risk from a hundred- year (100-Y) flood. A 100-Y flood is defined as a flood level with a one percent or greater chance of being equaled or exceeded in any given year. The areas at risk from a 100-Y flood are determined through statistical analysis of historical records, topographic surveys, and hydrologic and hydraulic analysis. The procedure First you need to set the working environment. 1. Start the Idrisi Taiga environment. In the Idrisi Explorer, in the “Project” page set the Name of the Project and the working folder (Fig. 1).
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2 Fig. 1: Setting the project parameters 2. Then, use the Display Launcher to view REVFIRM , an image of the flood risk zones in Revere. Select option 2, Qualitative palette, to display (Fig. 2). Fig. 2: Setting options for displaying the REVFIRM raster The image as displayed does not show the location of either the coast or the estuaries in this community (Fig. 3).
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3 Fig. 3: Displayed REVFIRM raster 3. Therefore, it is required to invoke the vector overlay option to complete the map composition with these data. Go to the “Composer” and select the option “Add layer” (Fig. 4).
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  • Spring '14
  • QianpingGuo

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