I guess this could have easily been posted on the Map 3D page instead, but I'll post it here since it's a civil engineering "thing."
I have a HEC RAS model which I ran a steady flow simulation on, and then I tried to use the GIS Export button to get a .sdf file. When I tried to connect to the .sdf file in Civil 3D, I got these errors:
Failed to connect.
Failed to open FDO connection.
File is not an SDF file, or is an SDF file with an unsupported version.
An error occurred during SDF database access.
I played around with the settings I chose when I exported in HEC RAS and couldn't get any different results. Anyone know what might be going on? Thanks for any help in advance!
The HEC_RAS sdf file format is a different format than the SDF used in Map3D or GIS. You will need to export it to shp file formats if you want to use it in anything other than Civ3D.
On the Insert ribbon, Import tab, below the fold, select Import HEC-RAS.
This command reads the USACE HEC-RAS SDF file format to import reach, and profiles contained in the SDF.
Generate the required layers with floodplain mapping, right click on the generated layer and select Save Layer As... You can save the layer as a shapefile and import it back into Civil 3D with MAPIMPORT.
I don't know how to get the results layer to show up on RAS Mapper.
Is it because I need to have a terrain layer? If so, I don't get that...why isn't the cross-sectional data sufficient?
You need the terrain file to generate the water surface elevation. We use ArcGIS to create the flt file needed for the terrain. I think the cross-sectional data is used to generate a water level at the cross-section and the terrain file is used to interpolate betrween the cross-sections.
I was able to finally get a .flt file through a workaround (http://au.autodesk.com/au-online/classes-on-demand
When I first tried this process I kept getting stuck at the step of exporting the surface to a GEOTIFF in Civil 3D...it seems that the surface I tried to export at first was too large, and when I used a smaller surface, it worked. I posted about my issue (and my realization of what the problem seemed to be) here: http://forums.autodesk.com/t5/AutoCAD-Civil-3D-Gen
Also, just for curiosity's sake and for the sake of the original question of the thread, is there a way to show the floodplain/water surface in Civil 3D using the .sdf file that HEC-RAS exports after executing the "Export GIS Data" command in the "File" menu?
Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register
Start with some of our most frequented solutions to get help installing your software.