A common question for geographic applications is what meaningful spatial boundary to use for a particular coordinate system, or which projection is suitable for a spatial area of application. terrestris now provides the answers to such questions and provides an online service.
The “Projection Utility” service initially offers the following two functionalities:
- Determination of an optimal bounding box for a specific projection
- Determination of suitable projections for a given point (longitude/latitude)
The implementation was done in PHP and the offered interfaces are JSON and JSONP.
Functionality and examples:
The service is available at http://www.webmapcenter.de/projection-utility and can be configured via corresponding URL parameters.
Example 1 – Calling a help page:
http://www.webmapcenter.de/projection-utility/index.php?mode=manpage
Example 2 – Querying a bounding box for the coordinate system EPSG:31467
http://www.webmapcenter.de/projection-utility/index.php?mode=getbbox&srs_num=31467
Example 3 – Querying suitable coordinate systems for Bonn
Thanks also to http://spatialreference.org, on whose data the service is based.
