QGIS

QGIS

Comparing Basemap Performance Across Plugins And Core Functionality In Qgis

Basemap Rendering in QGIS: Overview A basemap in QGIS provides spatial context and orientation for overlaying other geospatial data layers. Basemaps enable users to visually locate and reference features and locations. Common basemap types include street maps, topographic maps, satellite/aerial imagery, and blank canvases. QGIS offers several options for loading basemaps: Core native capabilities like…

Step-By-Step Guide To Creating Custom Polygon Layers With Qgis Geometry Expressions

What is a Geometry Expression? A geometry expression in QGIS is a textual definition of a geometric shape using functions and operators. They provide a flexible and powerful way to construct custom polygon vector layers without needing to create or edit the underlying geometry manually. Geometry expressions allow users to define polygons by specifying vertices,…

Tips And Tricks For Debugging Geometry Generation Issues In Qgis

Geometry errors in spatial data can cause a variety of issues when working with QGIS. Identifying and resolving these errors is an important troubleshooting skill for effective QGIS usage. This article provides tips and tricks for debugging common geometry generation issues in QGIS. Identifying Geometry Issues in QGIS The first step in fixing geometry errors…

Common Pitfalls And Limitations When Generating Geometries In Qgis

Troubles with Geometry Creation When working with geospatial data in QGIS, users can encounter various issues when creating and editing vector geometries. Invalid geometries, limitations of geometry tools, and failures to follow best practices often undermine efforts to accurately model real-world spatial entities. Invalid Geometries and How to Fix Them Invalid geometries refer to vector…

Harnessing The Power Of Qgis Geometry Expressions

What are Geometry Expressions and Why Learn Them? Geometry expressions in QGIS provide a powerful set of tools for performing spatial analysis and manipulating geographic data directly within the QGIS interface. They allow users to calculate geometric properties like area and length, test spatial relationships between features, construct new geometries from existing ones, and filter…

Batch Transforming Layers: Efficiently Reprojecting Multiple Files In Qgis

The Problem: Tedious Manual Processing for Batch Transformations When working with geographic data, one common task is to reproject multiple data layers from one coordinate reference system (CRS) to another. This allows disparate datasets using different CRSs to be viewed and analyzed together within the same reference system in applications like QGIS. However, reprojecting many…

Common Printing Bugs In Qgis And Potential Fixes

Identifying the Printing Bug As a powerful open source geographic information system (GIS) software, QGIS offers robust map printing capabilities for users. However, common bugs in the print process may impact your ability to generate high-quality printed outputs. Detecting the type of printing issue is the first step towards corrective fixes. Key clues to the…

Meters Vs Degrees: How To Force Qgis Buffer Tool To Use Metric Units

The Problem: Buffers Created in Degrees Instead of Meters A common issue when working with geospatial data in QGIS is that distance and area calculations can unexpectedly be returned in geographic degrees instead of projected units like meters. This happens frequently when using the Buffer tool to create buffer zones around vector features. For example,…

Common Pitfalls And Solutions For Using Pyqgis In Windows Standalone Scripts

Troubleshooting QGIS Python Issues on Windows Locating the Cause When issues arise with PyQGIS scripts on Windows, the first step is identifying the root cause. Check any error messages output to the console or logs for clues. Error messages indicating file paths, access issues, or version conflicts can help narrow things down. If a particular…