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.
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.
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!
I appreciate the response, Shawn.
Since I was starting off with a dgn that was exported from C3d, I did not set the coordinate system correctly once I selected Washington South USSF. I'm still trying to understand where exactly I went wrong.
Ultimately, it was a combination of the civil files set in "feet" under drawing utilities units, and me not selecting the correct option once selecting the correct geographical coordinate system. ORD notices that the data is in feet, but you have selected us survey feet, and it asks you what you want to do. I believe I was selecting the wrong option and because I did that, everything I did from then on was going to result in incorrectly projected data.
Thanks!
I appreciate the response, Chuck. Like I told Josh, above, it is the fact that in C3D, there are two units of measure location (like ORD). One is the GCS, which will state Washington South us survey feet (nad83), and then under drawing utilities > units > drawing units > insertion scale. The unit of measure listed there, needs to be USSF, otherwise if its set to feet, ORD pulls that unit and thinks the data is is international feet (from what I am gathering and understanding). So, what I did was, open the dwg in civil3d, then change that unit of measure to USSF, save as a different copy, then brought that copy into ORD. This time, ORD asked me to select what unit of measure the data is in, instead of telling me that it was in feet and not giving me any other options. Thanks!
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!