4

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

Is it possible to open it in QGIS?

Improve this question
1
  • The SDF file generated by HEC-RAS can be read by the HEC-GeoRAS extension for ArcGIS.
    – thwllms
    Commented Sep 27, 2015 at 16:50

1 Answer 1

Reset to default
2

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.

Improve this answer
2
  • 2
    arcgis does not support sdf, it is only used by autocad-map and mapguide.
    – warrieka
    Commented Jan 3, 2015 at 22:55
  • hec-georas with arcgis?
    – felipesaam
    Commented Jan 7, 2015 at 23:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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