Welcome to the Spatial Thoughts Newsletter #4

[see previous newsletters]

Geometry Generators

QGIS 2.14 saw addition of whole new way of styling vector layers - Geometry generator. This is a renderer that allows you to use expressions to change the geometry of the features on-the-fly.

This is a difficult concept to get used to at first. In GIS, Data processing and Cartography are usually separate workflows. You analyze and pre-process your data into a form that you want first, and then style them to convey the results. With the Geometry generator symbology, you are able to combine these two workflows in a single step. Not only that, but it enables whole new types of styling using nested renderers.
I show a simple but powerful use of Geometry Generators in the tutorial Nearest Neighbor Analysis (QGIS3) to visualize the output of distance matrix.
Below are some resources to help you learn and master Geometry Generators

New tutorials for QGIS3

Most tutorials are fully re-done with new materials and better techniques to work with QGIS 3.4 LTR. Here are the new tutorials that you may want to check out.

More Learning Resources
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-Ujaval Gandhi
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