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
mammal_list.xlsx
Description: MS-Excel 2007 spreadsheet
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