DESCRIPTION
PDL interface to the Proj4 projection library.For more information on the proj library, see: http://www.remotesensing.org/proj/
AUTHOR
Judd Taylor, Orbital Systems, Ltd. judd dot t at orbitalsystems dot comDATE
18 March 2003CHANGES
1.32 (29 March 2006) Judd Taylor
- Getting ready to merge this into the PDL CVS.
1.31 (???) Judd Taylor
- Can't remember what was in that version
1.30 (16 September 2003) Judd Taylor
- The get_proj_info() function actually works now.
1.20 (24 April 2003) Judd Taylor
- Added get_proj_info().
1.10 (23 April 2003) Judd Taylor
- Changed from using the proj_init() type API in projects.h to the - proj_init_plus() API in proj_api.h. The old one was not that stable...
1.00 (18 March 2003) Judd Taylor
- Initial version
COPYRIGHT NOTICE
Copyright 2003 Judd Taylor, USF Institute for Marine Remote Sensing ([email protected]).GPL Now!
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SUBROUTINES
fwd_transform($lon(pdl), $lat(pdl), $params)
Proj4 forward transformation $params is a string of the projection transformation parameters.Returns two pdls for x and y values respectively. The units are dependent on Proj4 behavior. They will be PDL->null if an error has occurred.
BadDoc: Ignores bad elements of $lat and $lon, and sets the corresponding elements of $x and $y to BAD
inv_transform($x(pdl), $y(pdl), $params)
Proj4 inverse transformation $params is a string of the projection transformation parameters.Returns two pdls for lat and lon values respectively. The units are dependent on Proj4 behavior. They will be PDL->null if an error has occurred.
BadDoc: Ignores bad elements of $lat and $lon, and sets the corresponding elements of $x and $y to BAD
get_proj_info($params_string)
Returns a string with information about what parameters proj will actually use, this includes defaults, and +init=file stuff. It's the same as running 'proj -v'. It uses the proj command line, so it might not work with all shells. I've tested it with bash.