[Qgis-user] How to outline regions consisting of multiple fields

[DelazJ]

Hi,

2017-09-12 8:19 GMT+02:00 Matt Boyd <mattslists at gmail.com>:

> I don't think there is a way to just select the outline / extent of the
> regions from the municipalities and display that but still keep the
> municipalities separate. There may be something with a virtual view if you
> loaded it into a GIS database but I'm just guessing now.
>
No need to have data in a GIS database for that. QGIS provides the
virtual layer format [0] which you can use to create the merged
features (if you don't want to store such a layer in your folders).

I don't know whether it's possible but wonder if the geometry
generator symbol can be used to aggregate features on the fly. Never
try!

Another hack could be to use the "Inverted Polygon" symbology (with
only the outlining as style) and checking the "Merge polygons before
rendering (slow)" option.


[0] http://docs.qgis.org/2.18/en/docs/user_manual/managing_data_source/create_layers.html#vector-virtual-layers

H.
>
> Matt
>
> On Mon, Sep 11, 2017 at 10:04 AM, Jeroen Hovens <mail at groenebij.nl> wrote:
>>
>> Hi all,
>>
>>
>>
>> I am trying to create a map with different visualizations for different
>> attributes.
>>
>> The map is a basic municipalities map and has at least two other
>> attributes that I want to show.
>>
>> Each municipality (each field/polygon) belongs to a region (attribute A)
>> and each municipality has a feature of some sort (attribute B).
>>
>> Now I am trying to create a map that will show the borders of the
>> municipalities (the basic polygons in simple thin outline), the outer
>> borders of the region (only a thick outline) and for each municipality a
>> color representing the value of the ‘feature’.
>>
>>
>>
>> My question is: how do I create only a thick outline of the outer border
>> for each region on my basic municipality map?
>>
>> I can give each region a color (style rule > categorize), but I don’t know
>> how to create an outline of the region border. Anything I try with lines
>> affects every single polygon instead of just the outer border of the region.
>>
>> Is it possible without creating a new layer with the regions as polygons?
>>
>> Since I will color each municipality according to ‘attribute B’, I want
>> just the outer border for each region to be visible to visually indicate to
>> which region the municipality belongs.
>>
>>
>>
>> Any idea’s?
>>
>>
>>
>> Regards,
>>
>> Jeroen Hovens
>>
>>
>>
>>
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>
>
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