Good afternoon, I have a very big polygonal layer (over 1 million objects). This layer contains a 'gid' column whose values uniquely identify each object. There is also a 'hierarchy_level_id' column: this string column allowing to characterize the importance/priority level of each object: 1, 2A, 2B, 3A, 3B.
My goal for this layer would be: - To perform a union process in the QGIS meaning: https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html#union - In the result/output file, I want to create two new columns. The first column list the 'hierarchy_level_id' for each feature. And a second column would retrieve the maximum value of the 'hierarchy_level_id' for each feature. In other words, for areas where there is one or more overlaps, I don't want that my union result contains as many identical features as there are features participating in this overlap. I want a single unique feature to be created per overlap/overlapping area. How can I perform this process with QGIS? Should I use the Qgis Union process? Use the aggregate function? Or something else? In advance, thanks so much.
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