jwkilgore Posted June 23, 2010 Share Posted June 23, 2010 I need to find the area of a closed polygon, less the area of a second partially overlapping polygon, and potentially less the area of other closed polygons. Specifically, I have a squarish zone around a point that is counted as temporarily disturbed area during construction (closed polygon). An existing access road crosses through this area, but is NOT counted as temporarily disturbed area. I also have footings, permanent new stub roads and/or hammerheads (turn-around locations) that are counted as permanently disturbed, so these would also be subtracted from the temporary area. I was originally going to use Hatch, but for some reason this isn't working well. Sometimes the hatch extends past lines for some reason, sometimes it says a valid boundary cannot be found, even where I click is completely surrounded by a closed polygon. I'm trying to get a new guy to do this, and there are over 350 sites. The process has to be very simple. I attached one site as a zip file because I couldn't get it to less than 250k. Any suggestions? Sample.zip Quote Link to comment Share on other sites More sharing options...
ReMark Posted June 23, 2010 Share Posted June 23, 2010 Have you tried using the Boundary command? Quote Link to comment Share on other sites More sharing options...
jwkilgore Posted June 23, 2010 Author Share Posted June 23, 2010 Not until just now (because I didn't know it existed), but it's giving me the same problem as Hatch. Actually, it looks like using pick points in Hatch calls the Boundary command internally, so I was already using Boundary. Fortunately, the results did allow me to figure out what's blowing up the hatch; something hinky is happening with automatic boundary creation in the lower right corner. It's where the straight line segment transitions to an arc segment just before it hits a crossing line. If I zoom in closer to this point THEN do a hatch or boundary, it selects everything correctly. If I'm zoomed out far enough to see the entire polygon then the software tries to create a full circle around this tiny arc segment. Maybe something to do with how the arc is drawn on screen, but VIEWRES had no effect. Has anyone tried this in a newer version of AutoCad? We're running 2007 because of client requirements. I'll just get the new tech to do what he can and draw a big circle around the problem sites. I'll come back through and work on those myself. Assuming noone else has a better sollution. Quote Link to comment Share on other sites More sharing options...
ReMark Posted June 23, 2010 Share Posted June 23, 2010 You might try looking for a custom lisp routine over at the Cadalyst Magazine website in their Tips and Tricks area. Quote Link to comment Share on other sites More sharing options...
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