Practical GIS tutorials: Python geospatial with GeoPandas, rasterio, STAC and OSMnx, plus QGIS, ArcGIS Pro and open GIS data sources for every country.https://www.technicalgis.com/en-gbhttps://www.technicalgis.com/tutorials/dem-to-stl-python/https://www.technicalgis.com/tutorials/dem-to-stl-python/Stream a Copernicus 30 m DEM of the Edale valley, reproject it to British National Grid, scale it to a 150 mm print and write a watertight binary STL using only NumPy, with checks that prove the mesh is printable.Wed, 14 Oct 2026 15:00:00 GMTPython3DDEMSTL3D printingNumPyrioxarrayCopernicus DEMPeak DistrictTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/fast-vector-geoprocessing/https://www.technicalgis.com/tutorials/fast-vector-geoprocessing/Benchmark point-in-polygon joins, buffers, overlays and dissolves on 200,000 points with GeoPandas and Shapely 2, see why spatial indexes give a 100x+ speed-up, and compare Shapefile, GeoPackage, FlatGeobuf and GeoParquet.Wed, 14 Oct 2026 14:00:00 GMTPythonGeoPandasShapelySpatial indexSTRtreeGeoParquetFlatGeobufPerformanceTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/interactive-web-maps-folium/https://www.technicalgis.com/tutorials/interactive-web-maps-folium/Turn GeoDataFrames into shareable Leaflet web maps: a one-line choropleth with .explore(), then a hand-built Folium map with custom styling, tooltips, clustered markers, switchable basemaps and plugins — saved as a single HTML file.Wed, 14 Oct 2026 13:00:00 GMTPythonFoliumLeafletGeoPandasWeb mappingNatural EarthTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/street-networks-osmnx/https://www.technicalgis.com/tutorials/street-networks-osmnx/Download Sheffield's walkable street network from OpenStreetMap with OSMnx, find the shortest walk across the city, draw 5–20 minute isochrones and map how far every street is from the nearest supermarket.Wed, 14 Oct 2026 12:00:00 GMTPythonOSMnxOpenStreetMapNetworkXIsochronesAccessibilitySheffieldTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/sentinel-2-stac-lake-mead/https://www.technicalgis.com/tutorials/sentinel-2-stac-lake-mead/Search seven summers of Sentinel-2 imagery with pystac-client, stream only the bands you need from Cloud Optimised GeoTIFFs, mask clouds, compute NDWI and MNDWI and measure how much of Lake Mead dried up between 2019 and 2025.Wed, 14 Oct 2026 11:00:00 GMTPythonRemote SensingSentinel-2STACNDWILake MeadDroughtWaterCloud Optimised GeoTIFFTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/raster-terrain-analysis-rasterio/https://www.technicalgis.com/tutorials/raster-terrain-analysis-rasterio/Read only the pixels you need from a cloud-hosted Copernicus DEM, reproject to British National Grid, derive hillshade, slope and aspect with NumPy, compute zonal statistics and draw an elevation profile — all in one script.Wed, 14 Oct 2026 10:00:00 GMTPython3DrasteriorioxarrayDEMCopernicusCloud Optimised GeoTIFFPeak DistrictTechnicalGIS Teamhttps://www.technicalgis.com/tutorials/geopandas-getting-started/https://www.technicalgis.com/tutorials/geopandas-getting-started/Load Natural Earth vector data with GeoPandas, reproject to an equal-area CRS, calculate population density, join cities to countries, dissolve to continents and draw publication-ready choropleths.Wed, 14 Oct 2026 09:00:00 GMTPythonGeoPandasNatural EarthSpatial joinChoroplethProjectionsTechnicalGIS Teamhttps://www.technicalgis.com/2022/10/02/visualising-a-cycle-track-in-3d/https://www.technicalgis.com/2022/10/02/visualising-a-cycle-track-in-3d/Turning a GPX track of the Wharncliffe Woods cycle route into a 3D scene and elevation profile in ArcGIS Pro.Sun, 02 Oct 2022 19:04:52 GMTArcGIS Pro3DArcGIS ProGPXElevation profileSportTechnicalGIS Teamhttps://www.technicalgis.com/2022/08/14/performing-bivariate-correlation-analysis-using-census-and-crime-data/https://www.technicalgis.com/2022/08/14/performing-bivariate-correlation-analysis-using-census-and-crime-data/Exploring the relationship between census variables and recorded crime with bivariate correlation analysis in ArcGIS Pro.Sun, 14 Aug 2022 12:53:57 GMTArcGIS ProArcGIS ProbivariatecorrelationstatisticsCensusTechnicalGIS Teamhttps://www.technicalgis.com/2022/08/13/how-to-add-google-maps-and-openstreetmap-layers-to-qgis/https://www.technicalgis.com/2022/08/13/how-to-add-google-maps-and-openstreetmap-layers-to-qgis/Add Google Maps and OpenStreetMap basemaps to QGIS using XYZ tile connections.Sat, 13 Aug 2022 16:12:50 GMTQGISQGISGoogle MapsOpenStreetMapTile Map ServicesTechnicalGIS Teamhttps://www.technicalgis.com/2022/08/13/creating-a-3d-printed-digital-elevation-model-in-qgis/https://www.technicalgis.com/2022/08/13/creating-a-3d-printed-digital-elevation-model-in-qgis/From a digital elevation model to a physical 3D print: preparing terrain in QGIS and exporting it for slicing.Sat, 13 Aug 2022 14:33:36 GMTQGIS3DQGIS3D PrintingDEMTechnicalGIS Teamhttps://www.technicalgis.com/2022/08/11/monitoring-lake-mead-drought/https://www.technicalgis.com/2022/08/11/monitoring-lake-mead-drought/A look at the dramatic fall in Lake Mead's water level during the 2022 drought.Thu, 11 Aug 2022 19:50:01 GMTRemote SensingDroughtLake MeadWaterTechnicalGIS Team