cartconvert is a package providing a set of cartography functions for the Go programming language to parse, convert, transform and project coordinates. The set of functions is typically required when interacting with online GIS systems as Google Maps, Bing Maps or OpenStreetMap.
The package provides the following functionality:
- Conversion between polar coordinates to cartesian coordinates
- Supports a set of standard reference ellipsoids (WGS84, Airy, Bessel) as well as user defined ones
- Direct Transverse Mercator Projection and inverse thereof for the projection of a Geoid (model of the earth) onto the surface of a cylinder (map projection); Also know as Gauss-Krüger projection.
- UTM coordinates to Latitude / Longitude
- Geohashing: Latitude, Longitude to geohash and vice-versa
- Helmert transformation to convert coordinates of one reference ellipsoidal model to another
- Various functions to parse different geodetic coordinate datums from string to internal data representations
goinstall github.com/the42/cartconvert
or alternatively download the package as tar file, extract the files into an empty directory and run
make install
All features provided by the package are covered by test cases.
The package is released under the Simplified BSD License See file "LICENSE"
The Geohashing implementation uses a well working yet inefficient implementation of bitsets using strings. It would be good to replace this with a set of bitwise operations on integers or use a (yet to emerge?) bit package
The implementation of the direct transversal mercator projection uses the iterative redfearn series algorithm. A very well explanation can be found in "OGP Publication 373-7-2 – Surveying and Positioning Guidance Note number 7, part 2 – November 2010"
To run the tests:
make test