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I used the "export GIS data" option in HEC RAS and got a SDF file.

Is it possible to open it in QGIS?

  • The SDF file generated by HEC-RAS can be read by the HEC-GeoRAS extension for ArcGIS. – thwllms Sep 27 '15 at 16:50
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i tried to do that, but apparently arcgis is needed to read .sdf format. Anyway I have an alternative to export the flooding surfaces to Qgis, but it's not the best way.

  1. In HEC-RAS after you have your results, go to View-XYZPerspective plots.
  2. Copy the image to a image editor and save it as png, or another image format.
  3. In QGIS go to Raster-Georeferencerer-Georeferencerer...
  4. Import the image and use the tool to georeference matching the cross sections (I had the cross sections in QGIS and then I exported to HEC-RAS as it says in the link Is it possible to export cross sections from QGIS to HEC-RAS).

Then you will have the surfaces in QGIS!.

I'm pretty sure it's not the best way to do that, but in my case it was a good solution. To do that I import the cross sections in UTM coordinate system.

  • 1
    arcgis does not support sdf, it is only used by autocad-map and mapguide. – warrieka Jan 3 '15 at 22:55
  • hec-georas with arcgis? – felipesaam Jan 7 '15 at 23:24

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