I have a little problem when create atlas with QGIS but I'm new and I have a step by step explanation.
I have a shapefile with 2 columns
a b 1 abc 2 cde 3 abc 4 efg 5 abc
I need create atlas with only
b attributes, without double values. Any suggestions?
The atlas must be have 3 pages.
With "abc", "cde" and "efg" not 5 pages one for line.
I send you 2 pictures, what I mean lose some polygons. The first is the original shape, the second is the dissolved shape. You can see there aren't some polygons. I don't understand why.