Visualizing Spatial Data with GeoJSON Viewer
A GeoJSON Viewer is an essential tool for cartographers, software developers, and GIS analysts to inspect and validate geospatial datasets. By uploading a GeoJSON file, you can immediately project coordinates onto an interactive map, visualize boundary limits, and check attribute tables without launching desktop applications like QGIS.
How GeoJSON Rendering Works on Web Maps
Standard web maps use raster or vector tiles representing the Earth's grid system. When you load a GeoJSON dataset into our viewer, the coordinates (longitude and latitude in degrees) are translated in real-time into the map's viewport coordinates using Web Mercator projection (EPSG:3857). The rendering engine draws lines, polygons, and markers onto a Canvas or WebGL overlay layer, aligning them accurately over baseline satellite or topographic maps.
Validating GeoJSON Structure & Properties
Beyond coordinate positioning, a good spatial viewer parses feature attributes. GeoJSON features contain a nested properties object which stores descriptive data (e.g. city names, region population, boundary IDs). Clicking on any feature on our interactive map opens a popup box detailing these values, ensuring that your metadata matches the geographic geometries perfectly.
Supported Geometry Types
Our viewer parses all standard RFC 7946 geometry specifications:
- Point & MultiPoint: Single locations or clusters representing landmarks, GPS logs, or cities.
- LineString & MultiLineString: Connected segments representing roads, transit routes, contours, or rivers.
- Polygon & MultiPolygon: Area definitions representing buildings, political boundaries, watersheds, or land parcels.