Create Terrain – Error in stats generation, values came back NaN

[WRO817]

I am having trouble importing terrain into HEC-RAS 5.0.3.

Here are my steps:

-Created surface in Civil3D 2017 with LiDAR .las data imported into point cloud.
-Exported surface from Civil3D as geotiff with 1.0 ft grid spacing (5GB file size).
-Import geotiff into SAGA GIS using Import/GDAL/Import Raster.
-Export to ESRI .flt file using SAGA GIS. Adjusted the .hdr file in notepad so HEC-RAS recognizes it. (Note: This step I also have tried using ArcGIS import/export functions and get the same result below)

Next I setup a new HEC-RAS file, set the projection file and go to import the terrain and get this message:

Any ideas? I’ve had success with running a 2D flow model before, although the terrain in that one was only 1GB and was on a Windows 7 machine.

[cameron]

why are you converting it to a float file? HEC-RAS can read geotif files and is what it converts it to when all is said and done.

[WRO817]

I’ve tried using the geotiff directly exported from Civil3D but get the same result. The reason I tried converting was I found this document on the autodesk website:

https://forums.autodesk.com/autodesk/attachments/autodesk/66/286834/1/Civil%203D%20with%20HEC%20RAS.pdf

Page 12 of that document it details the process I’ve tried.

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