I have a contour map that i need to flip all the postive contours to negitive. So the Z cordinate for example is Elv 40 now i need to invert it to -40. I want to do this to the whole large contour map. ????
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set the UCS to look from the right side (or from front) and then mirror your contours.
- alfred -
is it contour data or contours representing a TIN/DEM?
If its contours as CAD objects, you could use the Map3D side of C3D to perform a drawing query to multiply all contours by a (-1) value and then recreate the surface.
I'm not a fan of surfaces from contours w/o the breaklines. The software has gotten better, but there's still a loss.
The miserable brute-force way would be to export to xml and then replace the elevations with a "-" character. dunno even where to approach that
Create a surface from the contours (do all the minimizing flat area options, you can read why HERE) if it's not already a surface. Create a flat surface at elevation 0 that's totally encompasses your surface. Create a volume surface that compares your surface as the base surface and the 0 surface as the comparison surface. Have the volume surface display contours. Extract the contours from the surface (if you don't want to have the surface).
Guess I was having a "blonde moment" when I didn't think of that one ealier - nice!
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