[Qgis-user] Request for Guidance on Using 'Dissolve' Tool in QGIS with IUCN Data

[Bernhard Ströbl]

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 <qgis-user at lists.osgeo.org> 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
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