Proj.4¶
Proj4 is a library that provides methods to transform between different coordinate reference systems. A geographic coordinate reference systems allows all points on the earth to be described as a set of coordinates (such as latitude, longitude and elevation). Different systems are used to represent the 3 dimensional earth on a flat, 2 dimensional map.
Proj4 is used in MapServer, GRASS GIS, PostGIS, Mapnik, Thuban, OGDI, TopoCad, OGRCoordinateTransformation and various others.
Proj4 has been translated from C to other languages <http://trac.osgeo.org/metacrs/wiki>. These sub-projects include: These tools include: * Proj4js (JavaScript) - used in OpenLayers. * CS-Map (C++) - used in MapGuide. * GeoTIFF/libgeotiff (C++). * Proj4J (Java). * SpatialReference.org - website to retrieve coordinate system definitions (obsolete).
Core Features¶
- Provides point transformation from one coordinate reference system to another.
- Includes transformation between datums.
- Large number of projection classes supported.
Implemented Standards¶
Proj4 uses coordinate system definitions defined by the European Petroleum Survey Group (EPSG) <http://www.epsg.org/>. Well Known Text (WKT) format.
Details¶
Website: http://proj4.org/
Licence: X/MIT style Open Source license
Software Version: 4.9.2 (stable)
Supported Platforms: Windows, Linux, Mac
API Interfaces: C, C++, Python, Java, Ruby