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I am working on the damages made by the typhoon Haiyan. I use QGIS 2.0 with extensions and toolbox, and MapInfo. I have vectors, rasters of the place.

I want to map the flood area along the coastline with analyze of the height of water. The picture below shows a result approaching what i would like to obtain

area of inundation and height of water

Beside i have a set of 70 points, with long/lat, area inundation, height of water

table of data

that are represented on this map

map of data

I suppose that a Satellite image has been used to get the points.

My questions are:

  1. is it possible to represent the areas of inundation with the attributes in the table?
  2. If no, what is the method they could have used ? (may be not easy to guess it!)
  3. If yes, what is the method to proceed?

Anyone has an idea ? Thanks a lot for your help:)

  • Is "MaxHei" the height of water above solid ground or height of water above mean sea level? Do you have an elevation model of the area? – underdark Jan 18 '14 at 22:19
  • above sea level and yes i have a DEM of the area – LaurentM Jan 18 '14 at 22:21
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I've never done flood modeling before but one simple approach I could think of is

  1. Interpolate the point data height of water values to generate a height of water raster
  2. Subtract the elevation model height from the water height raster to determine which areas would be under water
  • and the point 2 is done using raster calculator, right? – LaurentM Jan 18 '14 at 22:40
  • @LaurentM right! – underdark Jan 18 '14 at 22:43

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