is gdal coded in C? if it is how do you interpret it into perl? I have found a module called Geo-GDAL but it is still a beta version but it might be useful.

GDAL is coded in C (or maybe C++, I'm not sure). What I meant was I just used the output of the command line program gdalinfo to get at the coordinates (using the `` operator).

Doing that means incurring some overhead, but since you can cache the results you really only have to do /whatever you need to do/ once per image, so usually you don't care*.

Besides, if you need to, it's probably relatively easy to write XS extensions using the GDAL library. I just didn't have to. I wrote some pretty extensive interfaces to geos though.

* or at least, not if you've got about two hundred images, all about 10Mb+ in size. The overhead of starting a separate process and filtering its output will be dwarfed by the disk IO.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

Searching CPAN for "GeofTiff" doesn't turn up anything about displaying them, but as I understand it GeoTiff images are essentially TIFF6 with some extensions, most of which are meta info extensions. I'm not sure how well regular TIFF software will deal with any of that.

There is a full spec, API reference, and source code for libgeotiff at http://www.remotesensing.org/geotiff/geotiff.html which may help you implement something to deal with the format.

#!/usr/bin/perl
use strict;
use warnings;
use Gtk2;


my @formats = Gtk2::Gdk::Pixbuf->get_formats();

my @exts;

foreach my $format ( @formats ) {
    foreach my $key ( keys( %$format ) ) {
           next unless $key eq 'extensions';  
         
       foreach my $elem ( @{ $format->{ $key } } ) {
                push @exts, $elem;
            }
        
     } 
 }
print "@exts\n";
[download]

#!/usr/bin/perl
use strict;
use warnings;
use YAML;
use Gtk2;

my (@formats) =  Gtk2::Gdk::Pixbuf->get_formats;
print Dump([\@formats]);
[download]