WScottAllenPE
2013-05-01, 08:16 PM
In my cross sections, I have three areas to determine for cut.
1.) Below existing surface and above existing subsurface (where existing pavement needs to be removed in its entirety)
2.) Below existing surface and above proposed subsurface (where existing material needs to be removed to put in new pavement)
3.) Below existing surface and above final grade (to remove overburden to grade to final surface).
91527
I can't do these under one sub-criteria because it will only find areas above BOTH existing and proposed subsurface, but I want to find areas above existing OR proposed (the lower of the two).
The approach I used does find all the areas that I need. However, they overlap. So, when I have a total cut area, it adds the separate parts together, giving me a high quantity.
91529
Any thoughts on how to get the area covered by the unique areas, not the overlapping areas? I can find the area with a fourth criteria of above both, but how would I get C3D to subtract it?
I thought maybe I could combine the subsurfaces to have only one surface to compare, but I can't find out how to build a surface selecting the lower of two surfaces AND KEEP IT DYNAMIC. (You can find where the surface difference contour is zero, use that as boundaries for pasting the surfaces together, etc., but is isn't dynamic, and I know the surfaces will change again. If I had to do this, then it would be just as easy to draw polygons and use fields for their areas.)
1.) Below existing surface and above existing subsurface (where existing pavement needs to be removed in its entirety)
2.) Below existing surface and above proposed subsurface (where existing material needs to be removed to put in new pavement)
3.) Below existing surface and above final grade (to remove overburden to grade to final surface).
91527
I can't do these under one sub-criteria because it will only find areas above BOTH existing and proposed subsurface, but I want to find areas above existing OR proposed (the lower of the two).
The approach I used does find all the areas that I need. However, they overlap. So, when I have a total cut area, it adds the separate parts together, giving me a high quantity.
91529
Any thoughts on how to get the area covered by the unique areas, not the overlapping areas? I can find the area with a fourth criteria of above both, but how would I get C3D to subtract it?
I thought maybe I could combine the subsurfaces to have only one surface to compare, but I can't find out how to build a surface selecting the lower of two surfaces AND KEEP IT DYNAMIC. (You can find where the surface difference contour is zero, use that as boundaries for pasting the surfaces together, etc., but is isn't dynamic, and I know the surfaces will change again. If I had to do this, then it would be just as easy to draw polygons and use fields for their areas.)