Awesome

EPSG.io

This service allows you to discover and transform coordinate systems from all over the world. Created and maintained by the MapTiler team.

Installation

$ virtualenv venv
$ source venv/bin/activate
$ pip install -r requirements.txt

Copy the content of "index" directory from the .zip from the latest project release.

Start the server with:

$ export FLASK_APP=app.py
$ export FLASK_ENV=development
$ flask run

or use the gunicorn startup scripts (./epsgio start)

Create your own index from EPSG export

Note: This is not required, as you can easily download the ready-to-use index from releases.

1. Download the newest EPSG database from [http://epsg-registry.org]
   • a. After login it will able to export registry as Export GML 3.2.1 with EPSG metadata
2. Make sure that these files(folder) are in one folder
   • a. folder extra_codes_proj4_4.8.0.2
   • b. file CRS_exceptions.csv
   • c. file CRS_exceptions.py
   • d. file gml_parser.py
   • e. file GmlDictionary.xml (downloaded EPSG database from http://epsg-registry.org)
3. Start indexing via python gml_parser.py
4. Move created gml.sqlite into gml folder

Types of URLs:

• [http://epsg.io/] > main page
• [http://epsg.io/1623] > transformation or crs
• [http://epsg.io/5514-1623] > crs with transformation
• [http://epsg.io/5514-1623.wkt] > page with wkt of crs 5514 with transformation 1623
• [http://epsg.io/5514-1623/map] > page with map of crs 5514 with transformation 1623
• [http://epsg.io/8901-primem] > other type then transformation or crs (prime meridia, datum,...)
• [http://epsg.io/ogp-op-1623] > gml:id from OGC XML
• [http://epsg.io/urn:ogc:def:coordinateOperation:EPSG::1623] > gml:identifier from OGC XML

CRS and Transformations are just codes (5514, 1623, 4326, 27700) Other are codes with suffix like:

• for datums e.g. 9315-datum
• for prime meridian e.g. 8901-primem
• for ellipsoid e.g. 7004-ellipsoid
• for method e.g. 9840-method
• for coordinate system e.g. 6422-cs
• for axis e.g. 106-axis
• for area e.g. 1262-area
• for units e.g. 9001-units

API for results

For result page exist a export in JSON and JSONP for example

[http://epsg.io/?q=czech&format=json&trans=1&callback=jsonpFunction]

where:

• format=json for export in json (obligatory)
• trans=1 for more detailed transformation in each coordinate reference system (optional)
• callback=jsonpFunction for jsonp where "jsonpFunction" is name of Javascript function (optional)

API for /trans

For one point

[http://epsg.io/trans?x=50&y=17&z=0&s_srs=4326&t_srs=5514&callback=jsonpFunction]

where everything is optional:

• x, y, z are coordinates of point, which going to be transformed (default is 0,0,0)
• s_srs represent source coordinate reference system (default is EPSG:4326)
• t_srs represent target coordinate reference system (default is EPSG:4326)
• callback=jsonpFunction is for jsonp where "jsonpFunction" is name of JavaScript function

e.g. [http://epsg.io/trans] will transform point on coordinates 0,0,0 from EPSG:4326 to EPSG:4326

For many points

[http://epsg.io/trans?data=17,50;17,50,300;17.132,50.456&s_srs=4326&&t_srs=5514]

Where

• data=x,y;x,y,z;x.x,y.y (for example)
• Delimiter between points is ;
• Delimiter between x,y,z is ,
• Delimiter between decimal is .

Types of queries

• kind:

• deprecated: 0(default), 1
• code: number of EPSG (5514, 4326,...)
• name: string of name (wgs 84, jtsk, s-jtks)
• area: string area of use (czech republic, world)
• area_trans: string area of use of transformation
• alt_title: alternative title (wgs84,...)

combinations: 8901 kind:PRIMEM, 1623 kind:COORDOP, code:1625 kind:COORDOP deprecated:1,...