QGIS Geometry From Expression

Geometry generators is a cool concept in QGIS that will allow you to alter the visual representation of a feature for display purposes, but did you knew you can actually create a layer using processing algorithm geometry by expression? This allows to have the actual features not only for display but for other purposes like analysis

In this video I will go into applying a geometry generator and then creating a layer using an expression.

The expression used in the video is the following

with_variable('nodes',nodes_to_points($geometry,true),
collect_geometries(
array_foreach(generate_series(1,num_geometries(@nodes)),make_line(geometry_n(@nodes,@element),centroid($geometry)))))

Timestamps
00:00 Using Geometry Generators in QGIS
00:50 Setting Geometry Generator Symbology
02:15 Add Geometry Generator Expression
04:08 Change Geometry Generator geometry type
04:42 Using processing to create geometry by expression
05:32 Exploding MultiLine by in place explode lines algorithms using processing

Website & blog: https://www.antoniolocandro.com
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