A 456 MB file is going to tax the resources of C3D. You'll need a 64 bit OS and probably at least 8 MB of RAM to process it. Allow maybe 30 minutes to process. Watch your resource monitor to ensure it is processing. If not kill it. I don't have any solutions after that. If you only need a portion of the area covered by the DTM, use a data clip boundary to reduce the area of the dataset to reduce processing.
You are correct about applying the CS parameters. C3D will tranform the data to your project CS if the parameters are applied. However it will not transform the vertical units per my previous comments.
It is my understanding that Geotiff's can be converted to DTM's but as far as I know using an FDO connection cannot produce a surface model directly. It will require additional steps (i.e Geotiff to SDF to contours to DTM) and I don't know if it is any more efficient resource wise. I think you can save those steps if you use the more direct approach.
I haven't tried Brians suggestion of using Infrastructure Modeler. It's a novel approach but it requires learning another product. Personally I'd rather not bring another application into the mix. Users (including myself) have enough on their plate learing C3D, Autocad and Map. My first impression of Infrastructure Modeler leaves me uninspired to invest time to learn it. http://forums.autodesk.com/t5/AutoCAD-Civil-3D/Dis
If IM is the only capable solution (aside from purchasing another product) then I guess we are stuck with having to utilize it.
Yes...It does tax resources. I do have 16 GB of memory though...and thought it completed processing in some short order, I still was not able to view or build a surface from that adf file, and I'm not clear why. I tried multiple times, no avail.
What is FDO connection?
Yes...I agree. With my structural engineering and architectural work, I'm not too excited about adding software either, if I don't have to. I've never gotten into Map very much.
FDO=Feature Data Object. It is a Map function for displaying common GIS data formats. Look in the Map help system. I don't think it will help you in this workflow, assuming you are wanting a C3D surface object from the data.
If you have no copyright troubles, feel free to give us the link to that monster 456 MB Dem: we could try to decimate it by means of opensource Gis...
"Here" where, sir?
Don't forget to add the clipping range, i.e. the lat/long coordinates of left lowest corner and right highest one.
Sorry for the late, sir, I took a couple of days off.
Your Dem has a 1/3" resolution, so I decimated it three times.
Here's my 1 arc-second release, try it and tell me what about:
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