UTM zones, Russian MSK local coordinate systems explained. 165 CRS in osm2cdr: WGS84, UTM, 122 MSK zones for all 85 RF subjects.
Hillshade from the global Copernicus GLO-30 DEM: Horn and Zevenbergen-Thorne algorithms, light azimuth and altitude, export to PNG/GeoTIFF or underlay beneath the vector map in PDF/SVG.
3D terrain model from the global Copernicus GLO-30 DEM: STL/GLB/OBJ/PLY/glTF subformats, vertical exaggeration, adaptive decimation. For 3D printing, Blender, Three.js and physical terrain models.
How to get contour lines in DXF/DWG for AutoCAD and Civil 3D: thin and bold contours on separate layers, elevation labels, area-adaptive interval. Source — global Copernicus GLO-30 30 m DEM.
Hypsometric elevation tint from the global Copernicus GLO-30 DEM: topo/arctic/grayscale ramps, blending with hillshade, export to PNG/GeoTIFF or underlay beneath the vector map.
How to prepare and load offline maps for travel without internet. OsmAnd, Organic Maps, Maps.me comparison — which to choose.
OpenStreetMap data quality analysis by country: completeness, freshness, buildings, roads. Europe, Asia, Africa comparison.
Zarr is a cloud-native format for multidimensional geodata storage. Chunked storage, compression, and Python xarray integration for climate and weather.
Digital city twins using 3D Tiles and CityGML. LOD levels, Cesium visualization, and applications in urban planning and smart city projects.
GeoPackage is an SQLite-based format for storing vector, raster, styles, and metadata in a single file. Complete guide for QGIS and ArcGIS workflows.
FlatGeobuf supports HTTP range requests and spatial indexing. Comparison with GeoJSON, examples for Leaflet, MapLibre, and OpenLayers.
What is GeoParquet, why it outperforms Shapefile for analytics, and how to use it with DuckDB, Python, and QGIS. A complete format guide.