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

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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.