World Coord Sys Tool

World Coord Sys Tool


(5 stars)


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100 - 500 downloads

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This powerful app allows you to convert coordinates between many of the world's coordinate systems. It uses the PROJ4 library and a lookup file containing projection and datum parameters to support over 1700 coordinate systems. Lat/lon, UTM, US State Plane, and many, many others are supported. You can also create your own coordinate systems if you know the parameters, including local grid systems.

The app either takes manual coordinate input or uses your current GPS location. The computed location can be displayed in Google Maps via your web browser with a single button press.

Supported projections:
* Albers Equal Area
* Azimuthal Equidistant
* Cassini
* Equal Area Cylindrical
* Eckert IV
* Eckert VI
* Equidistant Cylindrical
* Equidistant Conic
* Gall
* Lambert Conformal Conic
* Mercator
* Miller Cylindrical
* Mollweide
* Oblique Mercator
* Oblique Stereographic
* Polyconic
* Robinson
* Transverse Mercator

In addition to these projections, the app also supports affine transformations to allow you to set up local grid systems. See for details.

Online help for the app is available at

The app also includes an IGRF calculator tool which used to be a separate app.

The IGRF calculator computes the Earth's current or historical magnetic field at a given location using the IGRF model. The magnetic declination computed is useful for compass navigation since it represents the difference between true north and magnetic north. Field inclination and total intensity are also computed which are useful for geophysics purposes. The input latitude and longitude are in decimal degrees and follow the usual conventions of -ve latitude being south and -ve longitude being west. This tool uses the International Geomagnetic Reference Field model (IGRF-12). See for full details. Years from 1900 through to 2020 are supported.

Permissions required: (1) GPS - to determine your location, (2) SD card access - to read and write user projections file.

Note 1: If editing the user projections file from within the app, make sure to close the app and re-select the coordinate system you've changed otherwise your changes will not be refreshed in the app.

Note 2: The convention used for the rx,ry, and rz values in the 7 parameter toWGS84 values may be different to some other software. If you experience a subtle difference in the results for a user projection which you create, try reversing the signs of these values.

Tags: world coord sys tools, mollweide proj4, equidistant conic projection agd84, world coordinate system tool proj4, latitude longitude to easting northing.

Recently changed in this version

1.29 Fixed bug with small negative lat/lon values in DMS and DM formats.
1.28 Changed app to follow the usual convention of showing latitude before longitude.
1.27 Fixed issue with keyboard popping up on main page and IGRF page.
1.26 Allow entry of years up to and including 2020 in IGRF tool.
1.25 Updated the IGRF tool to use the IGRF-12 model which is valid until 2020.
1.24 Added IGRF tool (it used to be a separate app).
1.23 Added a link to the online help from the help dialog within the app.

Comments and ratings for World Coord Sys Tool
  • (80 stars)

    by Boris Bilc on 25/10/2013

    Speachless... a must have app for anyone who is working with coordinate conversions on the field. Beeing able to use custom 7-parametric transformations is just wonderful. Thanks for developing this app, keep up the good work!

  • (80 stars)

    by John Ryan on 03/06/2013

    Amazingly comprehensive projections support