QGIS Vector Analysis: Buffer, Spatial Join, Union & Intersect Analysis in QGIS Explained

Buffer, spatial join and overlay analysis are the core of everyday GIS work, and they trip up almost everyone at the start. In this walkthrough, Francis Otia takes you through buffer analysis, spatial joins, union and intersection, layer styling, and turning spreadsheet data into a usable attribute table, all in QGIS. Follow along with your own data. By the end you will know which overlay tool to reach for, how to join attributes by location, and how to bring tabular data into your map. This session is part of GeoDev Lab Africa, a free twelve-month guild that turns GIS analysts into geospatial developers. Learn. Build. Collaborate. Transform. Chapters 00:00 Intro 03:12 Buffer Analysis in QGIS 04:17 Spatial Join in QGIS 08:48 Performing intersection in QGIS 11:14 Performing Union in QGIS 16:48 Layer styling in QGIS 35:45 Converting spreadsheet data to attribute data Presented by Francis Otia, GIS Consultant specialising in spatial analysis, site selection, Web GIS and remote sensing, and a 2026 Global Climate Geodesign Competition finalist. Join the community Whatsapp: https://chat.whatsapp.com/HwWo3nb95U9... YouTube: @geodevlabafrica LinkedIn: linkedin.com/company/geodev-lab Instagram: @geodev_lab X: @geodevlabafrica #QGIS #GIS #SpatialAnalysis #Geoprocessing #RemoteSensing00:00 Introduction