Is it possible to export a DTM (TIN surface) to ESRI's ASCII grid format (for ArcGIS)?
I've attached an example file.
Failing that, is it possible to export to a simple XYZ point file?
I'm not sure if this is possible - hopefully someone else will come in and prove me wrong...!!!
It is easy anough to produce a simple XYZ of the triangle points although the surface may not be exactly the same as the triangles are not exported.
Display the surface with points turned on and then Extract Objects > Points from the surface, then perform a data extraction or _MAPEXPORT on the Points direct to shp file (I've attached the dbf for one I just did)
If you already added your TIN to a surface definition, then create a Dem file with _SURFACEEXPORTTODEM, finally you convert the resulting .TIF (or .DEM) to .ASC format, by means of the opensource Microdem.
Forgive me for resurrecting an old thread - is there still no direct way in 2014 to export a surface as an asc file from Civil 3D? I can't seem to find one.
... no direct way in 2014 to export a surface as an asc file from Civil 3D.
Keep in mind that assuming your surface is likely TIN based it will have to be converted to a grid first (since the ESRI Ascii Grid Format is grid based). So regardless you are going to end up with a grid interpretation of your TIN.
ESRI has a TIN format, I think its called "ArcInfo UnGenTIN (*.net)". Our MapWorks Surfaces module it's currently a two step process to get to ASC, Surface Manager to export the TIN to a file, then Surface Convert to convert the TIN to an Ascii Grid. As I typed that I realized we need to add the conversion to the surface manager (a minute wasted).