GIS coaching for territorial management.
Spatial databases can contain millions of geographic objects. In some cases, a PostGIS query may take several seconds — or even several minutes — to execute. This problem often occurs when: In this article, we will…
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When working with PostGIS, understanding spatial relationships between geometries is essential for building efficient queries. Two of the most widely used functions—ST_Intersects and ST_Within—are often confused, yet they serve different purposes. In this guide, you’ll learn…
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Georeferencing in QGIS is an essential technique that allows you to align an image with real-world geographic coordinates using control points. Whether you’re working with a scanned map, a PDF plan, or an image without spatial…
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Cloud Optimized GeoTIFF (COG) has become a key format for distributing geospatial rasters over the Internet. Unlike standard GeoTIFF, it allows GIS software such as QGIS to read only the necessary portions of a file stored…
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When working with geographic data in QGIS, several file formats can be used to store vector layers. Two formats are particularly common: Shapefile and GeoPackage. Shapefile is a historical format that has been widely used since…
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When working with geographic data in QGIS or in web mapping applications, two coordinate systems appear very frequently: EPSG:4326 and EPSG:3857. These two systems are used in many contexts, but they do not represent coordinates in…
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