Visualizing Vector Data (Part 2): Rule-Based Visualizations and Labelling

Surveys and statistical programs – Documentation: 89-20-00052020010

This document is no longer available. We regret any inconvenience this may have caused. To obtain a copy, please contact us.

Description: In this follow-up QGIS tutorial on visualizing vector data, we’ll cover rule-based symbologies and labelling schemes, available symbology file formats and creating advanced labels with expression syntax. Follow along as we develop rule-based styles and symbology files with the CPRoads layer – creating a dynamic visualization of different road classes that changes with the scale of the map canvas. Rule-based symbologies and labels are incredibly powerful in creating advanced visualizations – enabling the specific parameters (e.g. fields, symbols, sizes, colours, outlines, and rendering scales) to be targeted for different features. A complementary skill is exporting these styles with available symbology files – which can be independent (.qlm) or directly tied to a source layer (.qlr). These pre-defined visualization files enable layers to be rapidly visualized when opening a new project. They can also be applied to other layers with common visualization parameters (i.e. fields and attributes), such as those from a different collection period or location, and facilitate sharing visualization styles with others. Finally, we’ll discuss the available label parameters (e.g. placement, scale, buffer, formatting) and discuss creating advanced labelling schemes – specifically showing the procedures for creating multi-field labels with the Field Calculator and conditional labels using expressions.
Issue Number: 2020010
Frequency: Occasional
Date modified: