@geoanalysis26: Geospatial Learning 033 | NDWI in QGIS: Create Virtual Bands + Verify with Google Satellite You understand NDWI in theory—but can you actually map flood water in QGIS using real Sentinel-2 data? Let’s do it step by step. In this practical tutorial, I show you how to calculate NDWI using Band 3 (Green) and Band 8 (NIR) inside QGIS and turn theory into a real flood map. What you’ll learn: How to load Sentinel-2 Level-2A imagery How to create NDWI using Raster Calculator (Virtual Band) Formula: (B3 - B8) / (B3 + B8) How to apply thresholding to extract water areas How to style NDWI for clear visualization How to verify your results using Google Satellite basemap Tips to avoid common mistakes (like cloud effects and wrong band selection) By the end, you’ll be able to confidently generate and validate water and flood extent maps for real-world analysis. 🚀 Call to Action: Want to improve your GIS and Remote Sensing skills? 👉 Subscribe for more practical QGIS tutorials 👍 Like and share if this helped you 💬 Comment if you want the next video #QGIS #Sentinel2 #GIS #remotesensing #FloodMapping #geospatialdata #satellitedata #EarthObservation #SpatialAnalysis #googlesatellite #LearnGIS #DisasterManagement
