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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi,<br>
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<div><span style="font-family: "segoe ui", "segoe ui web (west european)", "segoe ui", -apple-system, blinkmacsystemfont, "roboto", "helvetica neue", sans-serif; font-size: 12pt; color: rgb(50, 49, 48); background-color: rgba(0, 0, 0, 0);">Yes i try with other
methods of </span><span style="font-family: "segoe ui", "segoe ui web (west european)", "segoe ui", -apple-system, blinkmacsystemfont, "roboto", "helvetica neue", sans-serif; font-size: 12pt; color: rgb(50, 49, 48); background-color: rgba(0, 0, 0, 0);">v.generalize</span><span style="font-family: "segoe ui", "segoe ui web (west european)", "segoe ui", -apple-system, blinkmacsystemfont, "roboto", "helvetica neue", sans-serif; font-size: 12pt; color: rgb(50, 49, 48); background-color: rgba(0, 0, 0, 0);">
tool with same problems.</span></div>
<div><i></i>I realize that if the generalisation tool creates a topological error on a part of the vector then the tool does not treat this part and leaves it as it is.</div>
<div>I didn't succeed in forcing him to do it.</div>
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<div>As a workaround i used https://mapshaper.org/ that implement the Visvalingam algo that work fine with a real time result!<br>
</div>
<div>(see <a href="https://gis.stackexchange.com/questions/87505/grass-v-generalize-method-douglas-not-working-as-expected" id="LPlnk376027">
https://gis.stackexchange.com/questions/87505/grass-v-generalize-method-douglas-not-working-as-expected</a>)<br>
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<div>My challenge is now to create a tool in grass with this Visvalingam algo.</div>
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<div>Best regards<br>
</div>
<div>Fabrice Dazin<br>
<img size="11238" contenttype="image/png" style="max-width: 100%; user-select: none;" unselectable="on" tabindex="-1" data-outlook-trace="F:1|T:1" src="cid:8590fe01-f45d-4f0d-8c6a-8ce2a9867149"><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De :</b> Markus Neteler <neteler@osgeo.org><br>
<b>Envoyé :</b> mercredi 26 août 2020 16:27<br>
<b>À :</b> DAZIN Fabrice (SIRS) <Fabrice.DAZIN@sirs-fr.com><br>
<b>Cc :</b> GRASS user list <grass-user@lists.osgeo.org><br>
<b>Objet :</b> Re: [GRASS-user] V.generalize</font>
<div> </div>
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<div class="BodyFragment"><font size="2"><span style="font-size:11pt;">
<div class="PlainText">Hi,<br>
<br>
On Mon, Aug 24, 2020 at 4:35 PM DAZIN Fabrice (SIRS)<br>
<Fabrice.DAZIN@sirs-fr.com> wrote:<br>
><br>
><br>
> Dear all,<br>
><br>
> In the process of transforming a raster classification into a vector layer, I use among others the command V.GENERALIZE.<br>
><br>
> v.generalize input=v_classif_ext@PERMANENT layer=1 type=area type=boundary method=reduction threshold=4 alpha=0.5 iterations=4 output=v_classif_ext_redv.generalize input=v_classif_ext_red@PERMANENT layer=1 type=area type=boundary method=sliding_averaging
threshold=100 alpha=0.5 iterations=4 output=v_smooth_1<br>
><br>
> with<br>
> grassversion=79<br>
> srid=2154<br>
><br>
> And I wonder why the smoothing result is not homogeneous, even sometimes for the same polygon.<br>
> Any idea about the reason?<br>
<br>
Not sure about this particular "reduction" method but did you already<br>
try with a different method?<br>
<br>
Best regards,<br>
Markus<br>
<br>
-- <br>
Markus Neteler, PhD<br>
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- free data with free software<br>
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