proj.4 Documentation, Release 4.9.3
proj.4 is a standard UNIX filter function which converts geographic longitude and latitude coordinates into cartesian
coordinates (and vice versa), and it is a C API for software developers to include coordinate transformation in their
own software. proj.4 is maintained on GitHub.
Platform Test Status and Coverage
Travis
AppVeyor
Coverage
Full documentation is available as a single PDF at https://raw.githubusercontent.com/OSGeo/proj.4/gh-pages/proj4.
pdf
CONTENTS 1