A quick look through your files and I didn't see any surface data. An OrthoTiff might contain surface data but I don't believe yours does. If you want to convert directly from GIS Data you need a file From ArcSDE, Oracle or a Shape file. See the AeccCreateSurfaceFromGISData command.
Your best bet is to see if you can download a DEM file. That would be a DEM, ESRI Arc Grid or a GeoTIFF with surface data. See: Creating a Grid Surface from a DEM
If you want to create a Civil 3D surface you need to use Civil 3D commands. Not Map 3D commands.
Allen Jessup
Allen Jessup
CAD Manager - Designer
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