About Proj4
Simple coordinate converter based on the Proj4 library http://http://trac.osgeo.org/proj The basic feature is the coversion of coordinates between two Coordinate Reference Systems. It includes the computation of the...
Simple coordinate converter based on the Proj4 library http://http://trac.osgeo.org/proj
The basic feature is the coversion of coordinates between two Coordinate Reference Systems. It includes the computation of the current megnetic declination based on WMM data.
The coordinates can be imported from MobileTopographer point lists.
The point can be visualized on maps/earth.
Java wrapper for proj4 by Martin Deruisseaux (2011) http://www.geoapi.org/geoapi-proj4/index.html
The app includes a limited number of Coordinate Reference Systems.
Custom Coordinate Reference Systems, in proj 4 sytax, can be added to the app.
See https://sites.google.com/site/speleoapps/home/proj4
Details and contacts: https://sites.google.com/site/speleoapps/home
Previous Versions
Here you can find the changelog of Proj4 since it was posted on our website on 2019-10-25 12:22:11.
The latest version is and it was updated on 2026-03-13 10:08:00. See below the changes in each version.
Proj4 version 1.1.23
Updated At: 2021-03-15
Changes: Simplified the interface of the coordinates conversion for TopoDroid
Proj4 version 1.1.22
Updated At: 2021-02-22
Changes: Bug fix: magnetic declination
Proj4 version 1.1.21
Updated At: 2020-02-01
Changes: Clean default values.
Proj4 version 1.1.19
Updated At: 2019-12-11
Changes: World Magnetic Model 2020 coefficients
Proj4 version 1.1.17
Updated At: 2019-08-20
Changes: Added Indonesia CRS
Disclaimer
Official Google Play Link
We do not host Proj4 on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Google and passed their terms and conditions to be listed there. We recommend caution when installing it.
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