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]
Lähetetty: 27. lokakuuta 2016 16:31
Vastaanottaja: Rahkonen Jukka (MML) <jukka.rahko...@maanmittauslaitos.fi>
Aihe: RE: [JPP-Devel] Visvalingam-Whyatt simplifier
Hi Jukka,
Yes, the algorithm comes directly from JTS. Here is how MD explains the
parameter :
"The simplification tolerance is specified as a distance.
This is converted to an area tolerance by squaring it."
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<mailto:jump-pilot-devel@lists.sourceforge.net>)"
<jump-pilot-devel@lists.sourceforge.net<mailto: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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