<div dir="ltr"><div>Thanks to all for the answers! I really appreciate.</div><div><br></div>@Daan, actually it should work for all the features for a specific field (I set it inside the code, but it may easily become an input parameter). So, after the setting of a specific field, the code will dissolve all the features which have the same attribute and that are adjacent (see the sample image in the answer).<br><br>@Anita, I think would be a new feature because, starting from the features with the same attribute value, I try to only dissolve those ones which are adjacent (so, it should be an additional feature to the "Unique ID fields" option).<br><br>@roy roy, I never used that tool but it does the same thing I'm trying to do for linestring geometries. It could be interesting having a similar feature (for both polygon and linestring vector) in the QGIS geoalgorithms!<br><br>Regards,<div>Marco</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-02-22 11:18 GMT+01:00 roy roy <span dir="ltr"><<a href="mailto:royroge@outlook.com" target="_blank">royroge@outlook.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Hi Anita, that does not do what Marco is asking for, because you get a multipart geometry;</p>
<p>he needs a linestring geometry I think...<br>
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<div class="m_2625857060463418824moz-cite-prefix">Il 22/02/2017 11:10, Anita Graser ha scritto:<br>
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<div class="gmail_default" style="font-size:small">Hi Marco,</div>
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<div class="gmail_default" style="font-size:small">The Dissolve tool already has a "unique fields" option. It sounds like you are reinventing that.</div>
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<div class="gmail_default" style="font-size:small">Best wishes,</div>
<div class="gmail_default" style="font-size:small">Anita</div>
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<div class="gmail_quote">On Wed, Feb 22, 2017 at 10:32 AM, Marco Grisolia <span dir="ltr">
<<a href="mailto:marco.grisolia5@gmail.com" target="_blank">marco.grisolia5@gmail.com</a>></span> wrote:<br>
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<div dir="ltr">Hi,
<div>I recently answered to a question on GIS StackExchange [0]. In this question, the asker was looking for a way for dissolving features using an adjacency criterion instead of using common attribute field (please, follow the link below for a better understanding).
This feature is already available in the analogous ArcGIS tool when the"Create multipart features" option is enabled and I think it could be of interest having an additional option like this in the "Dissolve" tool main dialog for next releases.</div>
<div>I never submitted a feature request on the QGIS Project site but, since there is already a (very rough) code and a general idea on how to approach the issue, I didn't know if this was the case of adding it there. Otherwise, let me know if I need to add
it on the QGIS Project site (if this is the case, I'm sorry for wasting your time).</div>
<div>Regards,</div>
<div>Marco</div>
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<div>[0] <a href="http://gis.stackexchange.com/questions/228267/merging-adjacent-lines-in-qgis" target="_blank">http://gis.stackexchange.c<wbr>om/questions/228267/merging-ad<wbr>jacent-lines-in-qgis</a></div>
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