https://spatialthoughts.com/category/aggregate/Recent content in QGIS Aggregate Function on Spatial ThoughtsHugoen-usThu, 26 Nov 2020 00:00:00 +0000https://spatialthoughts.com/2020/11/26/spatial-homogeneity-testing-qgis/Thu, 26 Nov 2020 00:00:00 +0000https://spatialthoughts.com/2020/11/26/spatial-homogeneity-testing-qgis/Rainfall is arguably the most frequently measured hydro-meteorological variable. It is a required input for many hydrological applications like runoff computations, flood forecasting as well as...https://spatialthoughts.com/2020/04/08/calculating-shared-border-lengths/Wed, 08 Apr 2020 00:00:00 +0000https://spatialthoughts.com/2020/04/08/calculating-shared-border-lengths/In a previous post, I showed how to use the aggregate function to find neighbor polygons using QGIS. Using aggregate functions on the same layer allows us to easily do geoprocessing operations...https://spatialthoughts.com/2019/09/26/fuzzy-table-joins-in-qgis/Thu, 26 Sep 2019 00:00:00 +0000https://spatialthoughts.com/2019/09/26/fuzzy-table-joins-in-qgis/Table Joins are a way to join 2 separate layers based on a common attribute value. QGIS has a Join Attributes By Field Value algorithm that allows you to perform table joins. A limitation of this...https://spatialthoughts.com/2019/05/23/neighbor-polygons-aggregate-qgis/Thu, 23 May 2019 00:00:00 +0000https://spatialthoughts.com/2019/05/23/neighbor-polygons-aggregate-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.https://spatialthoughts.com/2019/04/19/advanced-aggregate-expressions/Fri, 19 Apr 2019 00:00:00 +0000https://spatialthoughts.com/2019/04/19/advanced-aggregate-expressions/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...https://spatialthoughts.com/2019/04/12/summary-aggregation-qgis/Fri, 12 Apr 2019 00:00:00 +0000https://spatialthoughts.com/2019/04/12/summary-aggregation-qgis/QGIS expression engine has a powerful a summary aggregate function that can do spatial joins on the fly. This enables some very interesting uses.