I have a drawing from Civil3D, a .dwg, and I have a land xml that was created from that data set by original drawing creators. Also, there was a .dgn created from the same .dwg file, which has some visible contours shown in .dgn. When I view .dgn and then create a terrain model with xml, to verify contours are correct, the terrain model contours and contours displayed in the .dgn, are consistently off horizontally. Seems to be an international foot to US Survey foot difference, since horizontal is off by about 3 ft everywhere. Cannot seem to be able to get the contours to overlap original drawing. Please, help!
See picture: Yellow are the terrain model and white are the dgn contours.
Hi,
I might check out your coordinate systems? makle sure to lok at EDITDRAWINGSETTINGS in C3d and check if there is scakle factor applied an also check the Coordinate system your importing into also they should match or you can correct up the coord system in openroads im not 100% sure if its the correct coordinate or reproject but try both see iof that helps
Thanks, Josh. Just as my Gut was telling me, it was a foot to US survey foot discrepancy. ORD was thinking that the C3D file was foot and not USSF, therefore was correcting for that, but was incorrect. I think I am good to go now, everything is lining up. Now, time to re-do everything and write it down and take screenshots, so I can replicate next time!
yea no problem we just switched to this program so im also trying to sort out all of it but i have noticed that our coords an scale factor and units i.e. FEET an Survey Feet are a thing also!
We have drawings and data coming in from people who are using Civil 3D and if the .dwg that they send, isnt set at us survey feet in the 'insertion drawing units', then the .dwg cannot be referenced correctly in ORD. It's been a pain, but at least I figured that out. I cannot wait until we get rid of the USSF at the end of 2022.