PDL::GIS::Proj (3)

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NAME

PDL::GIS::Proj - PDL interface to the Proj4 projection library.

DESCRIPTION

interface to the Proj4 projection library.

For more information on the proj library, see: www.remotesensing.org/proj

AUTHOR

Judd Taylor, Orbital Systems, Ltd. judd dot t at orbitalsystems dot com

DATE

18 March 2003

CHANGES

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, Institute for Marine Remote Sensing (judd@marine.usf.edu).

Now!

This program is distributed in the hope that it will be useful, but

; without even the implied warranty of or

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

>null if an error has occurred.

BadDoc: Ignores bad elements of $lat and $lon, and sets the corresponding elements of $x and $y to

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

>null if an error has occurred.

BadDoc: Ignores bad elements of $lat and $lon, and sets the corresponding elements of $x and $y to

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.