I have a surface that was created in Carlson. The vertical data used to create the surface was based on NAVD 88. I need to transform the surface to ORD datum which is about 1.2' lower. Is there a way to "lower" the surface, short of recreating it?
It is possible to do a variety of operations on a surface once it is built using the Triangulation File Utilities command (aka "TIN File Utilities"). Look for the command on the Surface menu. If it is not there, you might need to launch it via the Command prompt by typing tinutil and pressing Enter. Once the command is launched:
1. Click the Load TIN File button and load your source TIN into memory.
- Optional - Click the Pick Bounding Polylines button if your operation is to only work on a subset of the surface model.
2. Click the Next button.
3. Click the Subtract Value button and indicate the amount you want to remove from the TIN.
4. Click the Save as TIN button.
I hope this information helps.
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Ladd Nelson
Thanks Ladd
You can also be obtuse and not use the fancy function:
Isolate your tri-lines
Move the tri-lines, choose any base point, type in '@0,0,-1.2'
Create a tin from the tri-lines.
There are so many ways to do things...
If you recreate a large surface from tri lines again, you have to go through all of the surface edits again. That was what I was trying to avoid.
