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Hi,
yes thats true - because DP is for data reduction, while VW is more for cartographic purposes, if i remember correctly.
stefan ------ Originalnachricht ------ Von: Rahkonen Jukka (MML) Datum: 27.10.2016 10:55 An: michael.micha...@orange.fr;OpenJump develop and use (jump-pilot-devel@lists.sourceforge.net); Betreff:Re: [JPP-Devel] Visvalingam-Whyatt simplifier Hi, I guess which method is better depends on use case. For visualization it may not be critical to cut some narrow branches like at the east coast in this demo
https://bost.ocks.org/mike/simplify/ -Jukka- Lähettäjä: Michaud Michael [mailto:m.michael.mich...@orange.fr]
Hi Jukka, Yes, the algorithm comes directly from JTS. Here is how MD explains the parameter : "The simplification tolerance is specified as a distance. I tried it quickly on a surface representing a river and noticed that it tends to truncate norrow affluents or to split the original polygon into a disconnected multipolygon. Maybe better for winding road simplification than for norrow surfaces. Michaël De : "Rahkonen Jukka (MML)" Date d'envoi : jeudi 27 octobre 2016 à 14h28 A : "OpenJump develop and use (jump-pilot-devel@lists.sourceforge.net)" <jump-pilot-devel@lists.sourceforge.net> Objet : [JPP-Devel] Visvalingam-Whyatt simplifier Hi Michaël, I tried http://sourceforge.net/p/jump-pilot/code/5110 with road network data and Visvalingam-Whyatt seems to keep the shape of winding roads better than Douglas-Peucker. I wonder what is the parameter of the function presenting. Is it the maximum delta in area that is accepted when the algorithm is removing vertices? Does the algorithm come directly from JTS?
-Jukka Rahkonen-
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