A step-by-step tutorial on visualizing the Trans-Siberian Railway and Pan-American Highway using OpenStreetMap data, Python, Cartopy, and Matplotlib — including pitfalls like incomplete OSM relations and how to work around them.
Discover free global health facility and school location datasets including WHO Health Facilities, UNICEF Global Schools Map, HDX health data, and the Malaria Atlas Project.
Discover free global natural hazards GIS datasets including the USGS earthquake catalog, GEM active faults, global flood hazard maps, NASA FIRMS wildfires, and GVP volcano data.
Discover everything about Overture Maps Foundation — the six data themes (Places, Buildings, Transportation, Addresses, Base, Divisions), how to download the data, and how to use it in GIS with GeoDataViewer.
Learn how to validate GeoJSON files for RFC 7946 compliance using the free online GeoJSON Validator tool. Catch geometry errors, coordinate issues, and structural problems.
Learn how to convert coordinates between Decimal Degrees, DMS, UTM, and MGRS formats using the free online GeoDataViewer Coordinate Converter tool.
Discover free global air quality datasets including PM2.5 surface concentration maps, Sentinel-5P TROPOMI satellite pollutants, and CAMS atmospheric composition data.
A curated guide to free global cropland, irrigation, and crop production GIS datasets — including GFSAD30, FAO irrigation, SPAM crop models, USDA CDL, and WorldCereal.
A guide to free global glacier inventory, snow cover, and sea ice datasets including the Randolph Glacier Inventory, MODIS Snow Cover, and NSIDC Sea Ice data.
Extract EV charging and gas station POIs from NYC OSM data with osmium, and compare with Overture Maps' GeoParquet pipeline.
Learn what GeoParquet is, why it works well for large geospatial datasets, how browser rendering works today, and where deck.gl fits next.
Convert DWG to GeoJSON step-by-step in your browser. Preview the layer, export GeoJSON, and troubleshoot common DWG conversion issues.
Step-by-step: open a Shapefile online in your browser, upload the required sidecar files, and troubleshoot missing .dbf/.shx/.prj issues.
What is a Shapefile and why does it include multiple sidecar files? Learn how Shapefile works, common issues, and how to open Shapefiles online.
Learn what an ESRI File Geodatabase (FileGDB) is, what it’s used for, and how to open or convert FileGDB datasets online.
What is GeoJSON and why is it so common in web maps and APIs? Learn the structure, use cases, limitations, and how to open GeoJSON online.
Learn what a GeoPackage (GPKG) file is, what it’s used for, and how to open or convert GeoPackage data online in your browser.
Learn what GML is, why it’s used in GIS and OGC services, and how to open or convert GML files online in your browser.
What is a GPX file and what is it used for? Learn how GPX stores tracks, routes, and waypoints, and how to open or convert GPX online.
Learn what KML and KMZ are, what they’re used for, and how to open or convert KML/KMZ to GeoJSON for modern web mapping.
Learn what MapInfo TAB and MIF/MID files are, how sidecar files work, and how to open or convert MapInfo datasets online.