3

I've got the Atlas function down (AWESOME!) and am generating maps for every feature.

What I need to do now is generate maps for groups of features based on a shared attribute.

fid | name | group
01  | a    | 1
02  | b    | 1
03  | c    | 2
04  | d    | 2

Essentially, two maps, one with "zoom to extent" for all group 1 features, and the other zoomed to extent for all group 2 features.

Is possible?

3

This may not be the most elegant, but here's the steps I took to solve this:

  1. Create a new multi-polygon layer with "Name" attribute.
  2. Draw bounding boxes around the groups of features and name it after the group (Automated with tool: minimum bounding geometry)
  3. Set the Atlas to "Hidden Coverage Layer" using the bounding layer just created.
  4. To highlight the features (bonus!): Set the atlas pagename to the Name attribute of the bounding box layer, then set the style of the features layer "Rule Based" and "Group" = $atlas_pagename
  • 3
    See if the concave hull and convex hull algorithms accept a grouping parameter. If they do you can use one of them instead of drawing bounding boxes manually. – csk Nov 6 '19 at 5:28
  • Those don't but the tool: minimum bounding geometry does. Man I LOVE QGIS! – user94812 Nov 6 '19 at 13:02
1

I had a similar problem and I did an other way:

1- In Vector ‣ Geoprocessing Tools, use the dissolve function

In your case you will select the common attributes as your group.

This will create a new layer, e.g. 'dissolve_layer', with a single polygon by group.

more info here : https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html?highlight=regrouper#dissolve

2 - Set your atlas : using the new layer'dissolve_layer' as coverage layer and hidde it, and set style to your original layer such as "group" =attribute (@atlas_feature, 'group')

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