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If you're writing a geoprocessing script, I'd recommend authoring a .lyr file you bundle with your toolbox and set the symbology in the script tool parameters to point to the .lyr file (see the "Symbology" part of the dialog).


1

You need to use Vector->GeoprocessingTools->Dissolve and dissolve by an attribute (Dissolve Field) to merge subdivided polygons.


1

You can show as many categories as you want in one layer, but you'll have to do some custom coding. My approach would be: Start with as many categories as you can using the Category Visualization Wizard (which I assume you're already doing). Click the CSS icon on the sidebar. This takes you to the CartoCSS editor. Here you can copy and modify the style ...



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