Hi Marcello, you can choose which fields QGIS should use for the dissolve process. Only features that are homogeneous throughout the chosen fields will be dissolved into a new feature. Hope this helps Bernhard
> Marcello Bilancioni via QGIS-User <[email protected]> hat am > 26.06.2023 01:54 CEST geschrieben: > > > Good morning, > > I am currently working with the mammal species distribution data provided > by IUCN, and analyzing these shape files in QGIS. > > As part of my analysis, I have been using the 'Dissolve' tool in QGIS to > merge rows of the same species into a single entry. This operation is aimed > at creating a single comprehensive polygon that represents each species' > entire distribution range. However, while the tool successfully > consolidates the geometries, it looses important attribute data from the > original attribute table. In particular, this leads to the loss of valuable > information within the "Presence" and "Origin" columns, where the values > can differ across entries for the same species. > > Could you provide any recommendations on how to avoid such data loss? Is > there a strategy or method that could effectively summarize or retain this > varied information while processing the data using the 'Dissolve' tool? > > Furthermore, in my dataset, I have noticed some specific values under the > "Presence" and "Origin" columns: "presence 3", "presence 6", and "origin 5" > (I have attached a list with those species here). According to the IUCN > guidelines, these values need to be updated or adjusted. Do you happen to > know how to update these entries within QGIS best? > > Thank you in advance for any assistance you can provide. > > Best regards, > > Marcello Bilancioni > _______________________________________________ > QGIS-User mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ QGIS-User mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
