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GeoRSS

GeoRSS was designed as a lightweight, community driven way to extend existing feeds with geographic information.

GeoJSON

GeoJSON is a format for encoding a variety of geographic data structures. A GeoJSON object may represent a geometry, a feature, or a collection of features. GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a geometry object and additional properties, and a feature collection represents a list of features.

GeoJSON has been adopted by more than 20 different projects, and represents more than a year of community development efforts.

Geotag

Geotag is an open source program that allows you match date/time information from photos with location information from a GPS unit or from a map.

License:GPL-2.0

HTML 5 standard for a Geolocation API

The Geolocation API defines a high-level interface to location information associated only with the device hosting the implementation, such as latitude and longitude. The API itself is agnostic of the underlying location information sources. Common sources of location information include Global Positioning System (GPS) and location inferred from network signals such as IP address, RFID, WiFi and Bluetooth MAC addresses, and GSM/CDMA cell IDs, as well as user input. No guarantee is given that the API returns the device's actual location.