benboggs Posted January 15, 2016 Share Posted January 15, 2016 Hello - We have a survey of a large high school site. The site is very long and skinny, lots of topo change. I have been trying to compose a site model for the site. However the model does not clip to the site boundary that I have drawn. What it does is it connects contour lines and generates its own boundary. The blue lines are the existing topo lines to my generated grade limits. However the green lines are the automatic connected topo lines. I do not want the site model to automatically connect lines. What I have done is take the survey CAD poly lines and generated a site model from those. Also - when I go to change the site model crop - the crop moves/manipulates the original survey contour lines. You can see as the contour labels from the survey are not in line with the VW generated survey contours. Why would a site model crop move the survey contour lines? I have watched many tutorials - but most are of square sites and not large complex sites. Thanks Quote Link to comment
rowbear97 Posted February 12, 2016 Share Posted February 12, 2016 Ben, Haven't seen any response from your inquiry and thought I could follow up and see what I can do for you. Would you be willing to share the file and I can give it a crack here? You have my email, reach out to me if you still need assistance. Quote Link to comment
AlanW Posted February 12, 2016 Share Posted February 12, 2016 Hi, the site model crop should solve the problem. See attached file, one original where I pulled out the site model crop out which allowed the contours to wrap around and the other where I pulled the crop line in and the contours did not show wrapping. HTH Quote Link to comment
benboggs Posted February 15, 2016 Author Share Posted February 15, 2016 Thanks for the replies. Robert - Ill try to send you the file today. Alan - the issue is when I move the crop - it adjusts the existing contours - it actually moves them in the site model. Therefore - the site model is no longer accurate. Quote Link to comment
benboggs Posted February 19, 2016 Author Share Posted February 19, 2016 I wanted to give an update (thanks Robert for your time yesterday on the phone). My experience so far has seen that when just using the autocad polylines to make a site model - VWs will take some liberties and truncate some of the swales, ridges etc. Roberts suggested I use the DTM file from the surveyor. It worked and the contours are almost (very few minor/insignificant differences) identical to that of the survey. however I am still curious as to why the VWs generated site model - when using jsut CAD 3d polylines - will not mimic the CAD contours perfectly? Thanks for all of the help from everyone who has commented. Ben Quote Link to comment
Benson Shaw Posted February 19, 2016 Share Posted February 19, 2016 Another technique for problem contours: Use Duplicate Along Path to create a bunch of evenly spaced 3d loci along each contour. Choose a repetition about equal to the minor contour separation. Then create the site model from the loci. If starting with 2d contour polylines, adjust the z of the loci to the value of the contour elevation. If starting with 3d contours at correct z, then the new loci will be created at correct z. It's probably best to place the loci on their own separate layer. Select all the loci (but not the contour polys) and create the site model. -B Quote Link to comment
J. Wallace Posted February 20, 2016 Share Posted February 20, 2016 Great idea Benson...thanks for that. Quote Link to comment
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