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Thread: Smoothing Polylines
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11th Oct 2007 05:21 pm
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Smoothing Polylines
Dear Forum,
I GPSed the locationof about six miles oflogging roads. Iimported the linesfrom my GPS intoAutoCAD 2008. Sincethe GPS takes pointsevery couple metersand the accuracyvaries over time theroads appearconvoluted andcontorted when youzoom in far enough.What is the simplestway to smooth thesepolylines?
Thank You
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11th Oct 2007 05:27 pm #2
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it's not as easy as doing a REGEN or REDRAW is it?
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11th Oct 2007 05:40 pm
hmmm maybe Pedit>Spline?
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11th Oct 2007 05:47 pm
REGEN and REDRAW don't seem to have any effect.
I played around with PEDIT -> SPLINE and it helped a little but didn'treally smooth the lines to the degree I was looking for. I triedchanging the spline settings but none of them seemed to have asignificant effect. Any advice on how to make the SPLINE moredramatic? Any other smoothing options? I would do it in ArcMap butfor some reason the student copy I have says that smooth is"disabled in arcView" and will not let me access the tool (under"advanced editing")
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11th Oct 2007 05:52 pm
However you smooth the polyline, it will use all of the GPS points (all5000 of them). What you need to do is to "weed" out some of thevertices, then when you curve fit, the shape will not be too jagged
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11th Oct 2007 05:57 pm
Thank you all for your help. I guess I will have to manually erasesome of the vertices that are far from the center of the road. Thisseems very time intensive and if any one can think of a faster wayplease let me know!
Maybe I can sort the points by accuracy and remove points beyonda certain threshold. Next time I am in the field I will reduce thelogging distance!
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11th Oct 2007 06:07 pm
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This was just postedthe other day- maybeit's what you're after?-
http://cadtutor.net/forum/showthread...highlight=weed
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