Thursday 8 June 2017

shapefile - How to dissolve polygons and aggregate their data in QGIS?



I have a shapefile (one layer) with my country but I have a problem.


It is divided into 4 entries (prefectures), and I want it as one, not 4.


Also, there is a table with some data, and I want to have one row with the sum of the data. For example:


Entry  1: population 10.000, 

entry 2: population 20.000,
entry 3: population 30.000,
entry 4: population 40.000.

Ultimately I want something similar to this:


main piece: population 100.000. 

(I don't care if this will be done by hand, its not much work!).


I'm a new QGIS user and i don't know much. Any help would be really appreciated greatly!




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