GIS in the Browser: Analyzing Uber Movement Data with Mapshaper

Mapshaper is a free and open-source software for spatial data processing. It is written in javascript and runs in your browser without any extra plugins and can perform a range of analysis. It started out as a tool for topologically-aware simplification, but has evolved into a swiss army knife of spatial data processing tools. All … Continue reading GIS in the Browser: Analyzing Uber Movement Data with Mapshaper

Find Neighbor Polygons using Summary Aggregate Function in QGIS

Read my previous posts Summary Aggregate and Spatial Filters and Advanced Aggregate Expressions to Automate QA to learn more about the powerful aggregate function. The aggregate function in QGIS was designed to work with 2 separate input vector layers, but we can also make it work with a single layer. Essentially performing spatial queries for … Continue reading Find Neighbor Polygons using Summary Aggregate Function in QGIS

Advanced Aggregate Expressions to Automate QA in QGIS

This post is the continuation of Summary Aggregate and Spatial Filters in QGIS. I have been exploring aggregate functions more and have found interesting ways to automate tasks in QGIS. One such example is helping automatically keeping track of feature edits to help with Quality Assurance (QA). Problem Statement: Users are editing multiple layers in … Continue reading Advanced Aggregate Expressions to Automate QA in QGIS