JSON Converter

What are JSON files?

JSON files with map data are text files that describe geographic objects, and the same extension can hide four different kinds of them. GeoJSON is an object with a type, which is a Feature, a FeatureCollection, or a plain geometry, and each feature has a geometry, whose coordinates are given as longitude and latitude on the WGS 84 datum, and a properties object with its attributes. TopoJSON extends GeoJSON by describing a topology: shapes are built from arcs that several objects can share, so a border between two regions is written once, and coordinates are quantized and stored as differences, with a transform member that gives the scale and shift needed to restore them, which makes files much smaller. JSON-FG, standardized by the OGC as version 1.0, is a strict superset of GeoJSON, which means that an ordinary GeoJSON reader still understands it, and it adds a place member for geometry in any coordinate system, time information, solids, circular arcs and other curves, and references to feature types and schemas, and it has the media type application/vnd.ogc.fg+json. Esri JSON is the structure that the web services of ArcGIS use, in which each feature has a geometry and attributes, and the coordinate system is given by a spatial reference, but it is not defined by an open standard. To tell them apart, a program looks at the type member and the other top-level keys: Topology, Feature, FeatureCollection, or features with a spatial reference.