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.. _usage:

================================================================================
Using PROJ.4
================================================================================

The main purpose of PROJ.4 is to transform coordinates from one coordinate
reference system to another. This can be achieved either with the included
command line applications or the C API that is a part of the software package.


.. toctree::
   :maxdepth: 1

   quickstart
   apps/index
   projections
   transformation
   resource_files
   environmentvars
   operations/index