CyberAngel
9th Aug 2007, 01:59 pm
A co-worker has a strange problem. We use LDD 2006. He built a surface from contours, created an alignment for a sewer line, sampled the existing surface, and drew a profile. The surface that appeared on the profile doesn't match the elevations of the contours, e.g. at station 0+00 the surface is 328.4 and the profile is 334.3. I thought it might be a simple offset, but the difference at the opposite end is about 2 feet off instead of about 6 feet.
Some things we know are not the problem. There's only one alignment in the drawing, so it's not a case of using the wrong alignment. There are only two surfaces, existing and proposed, and the proposed surface doesn't extend to the area where the alignment starts. The Terrain Model Explorer says that the minimum elevation of the existing surface is at 328.4. It's almost like the profile generator is reading surface data from a different project, but the project path in the title bar matches the drawing path. Anybody have any ideas?
Some things we know are not the problem. There's only one alignment in the drawing, so it's not a case of using the wrong alignment. There are only two surfaces, existing and proposed, and the proposed surface doesn't extend to the area where the alignment starts. The Terrain Model Explorer says that the minimum elevation of the existing surface is at 328.4. It's almost like the profile generator is reading surface data from a different project, but the project path in the title bar matches the drawing path. Anybody have any ideas?