This site is the primary source for the cartographic projection library libproj4.
This library supports over 170 projections including many used in
national grid systems. Many more projections are available by
selection of appropriate values for control parameters of current base
Circa 2002 the libproj4
system is an outgrowth of the author's PROJ.4
system and corrected inconsistencies of the old system and
improved overall operation. It also ensured that identifier
namespace became restricted to PJ_*/pj_*. The old PROJ.4
system is still available at some web sites such as Remote Sensing Organization
site. The web sites associated with PROJ.4
may have performed their own modification to the PROJ.4
library so there is no guarantee of the same collection of projections
nor functional equivalence.
|Documentation of alternate
Oblique Stereographic projection
library and test prog. source distribution
in RCS wrappers
||libproj4 library, etc,
w/o RCS wrappers
Notes on Installation of libproj4 system
Because of the extrodinarily
extreme complexities of the manuals for making the typical
"configure" procedure and the fact that libproj4
is an easy system to install it is left to the installer to do necessary
"tweeks" to the Makefile. In most circumstances, simply
is sufficient. But be sure to check the Makefile to make sure the
destination directories are suitable for your system. Also check
the README file for any
additional caveats and suggestions.
The manual is slowly evolving. Information provided describes
usage of the library and many internal functions but complete
documentation of the projections is incomplete. Use the older
manuals at the sites listed at the top of this page for material on
projections not described in the manual.pdf.
For a list of library modules and individual update dates click here.
In all cases, undivided
attention will be given to reports of failure of the software to give
correct results. However if problems are related to the
nature of the host operating system, I can only give assistance to Linux
here for questions or problems.