Revit and topo files just never seem to work for us right away, we have to make them work. No matter how hard we try to import them to elevation zero, it refuses to actually end up there, or, it ends up there, but when we edit the toposurface, the points say they are at one elevation, but in Revit it is at a different elevation. Here has what has been working for us.
Import the topo file at elevation zero. This may mean creating a new level called Site Level. Create the topo using toposurface- use instance- import instance, then select the topo lines only. Check the elevation of the toposurface. I set a level to a known height, change it's view properties to cut at zero, and go to that view to see if the cut is taken at the proper place compared to the original Cad file. Usually this puts it in the right spot, but does not mean that revit think the points are right. Edit the toposurface, click a know point and it may be off by 10 feet or more. Not to worry, if revit is taking the cut in the right place, then leave it alone.
In some instances Revit will put the toposurface at the wrong elevation, 100 feet or more off. Edit the toposurface, click on a known point and right down the difference of what that point should be. Go into an elevation and move the whole toposurface up the difference to put it in the right place. Take a cut through it and make sure the cut is taken in the right place.
Unfortunately topo has always been a guess and check thing for us, no magical fixes found yet. We've tried isolating the topo and double checking everything in Autocad. It appears to be a Revit issue though. So anyone out there having the same issue. Know that we all do.
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