I just found an old program that I wrote a while ago (with help from zentara, I believe). The program initially loaded an 8 bit geotiff but I would like to use the USGS Seamless maps, which are 32 bit. When I go to try and load it I get this:
Failed to load image 'NED_52181266.tif': Failed to load RGB data from 
+TIFF file: Sorry, can not
handle images with 32-bit samples at goo2.1.pl line 64.

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Which is the line:my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file ($filename);. So since it has been awhile, curiosity struck me in wondering if there has been any improvements. IOWs is there any way to display these geotiffs?

For good measure heres the code:

#!/usr/bin/perl
use warnings;
use strict;
use Glib qw/TRUE FALSE/;
use Gtk2 -init;
use Goo::Canvas;
use Image::ExifTool;
use Geo::Coordinates::UTM;
#use Geo::ShapeFile;

#variables
my $ellipsoid = 23; #static WSG83
my $zone;
my @mtp;
my @ps;
my @cs;
my $count = 1;
#my %waypoints = ();
#my @drop;
#my @points;
my $way_ref = [];
#my $shape_ref = [];

#GeoTiff Info
my $filename = 'NED_52181266.tif';
my $exifTool = new Image::ExifTool;
my $info = $exifTool->ImageInfo($filename);
foreach (sort keys %$info) {
    print "$_ => $$info{$_}\n";
    #Find the right keys(data)
    if ($_ eq "ModelTiePoint"){
        @mtp = split(/ /,$$info{$_});
    }
    if ($_ eq "PixelScale"){
        @ps = split(/ /,$$info{$_});
    }
    if ($_ eq "ProjectedCSType"){
        @cs = split(/ /,$$info{$_});
        $zone = $cs[3];
    }
}

#Create Window
my $window = new Gtk2::Window ( "toplevel" );
$window->signal_connect ("delete_event", sub { Gtk2->main_quit; });
$window->set_border_width (10);
$window->set_size_request(640,480);
$window->set_position('center');

#Create Scrolled Window
my $scwin = Gtk2::ScrolledWindow->new();
$scwin->set_policy('always','always');
$window->add($scwin);

#add canvas
my $canvas = Goo::Canvas->new();
$scwin->add($canvas);
my $root = $canvas->get_root_item();

#waypoint lines group
my $way_group = Goo::Canvas::Group->new($root);

#add Background image
my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file ($filename);
my $image = Goo::Canvas::Image->new($root, $pixbuf, 0, 0,
    'width' => $pixbuf->get_width, 
    'height' => $pixbuf->get_height);

#fills the canvas with the image; default(0,0,1000,1000)
#$canvas->set_bounds(0, 0, $pixbuf->get_width, $pixbuf->get_height);

#handle the events
$canvas->signal_connect (event => \&event_handler);

#Start the waypoint connector
my $points = Goo::Canvas::Points->new($way_ref);
my $way_lines = Goo::Canvas::Polyline->new($root,TRUE,undef,
    stroke_color => 'black',
    line_width => 3);
$way_lines->set(points => $points);

$window->show_all;

Gtk2->main;

#------------------------------------------------
#handle the mouse events
sub event_handler {
    my ( $widget, $event ) = @_;
    
    #on 2 mouse presses
    if ( $event->type eq "2button-press" ) {
        my ($x,$y) = ($event->x,$event->y);
        print 'x->',$x,'  ','y->',$y;
        
        #convert UTM to Lat and Long
        my $easting = $ps[0] * $x + 0.0 * $y + $mtp[3];
        my $northing = (-$ps[1]) * $y + 0.0 * $x + $mtp[4];
        my ($latitude,$longitude)=utm_to_latlon($ellipsoid,$zone,$east
+ing,$northing);
        print " ($latitude, $longitude)";
        
        #Drop waypoint icon
        my $tgroup = Goo::Canvas::Group->new ($root);
        Goo::Canvas::Ellipse->new($tgroup,$x,$y,7.5,7.5,
            fill_color => 'purple',
            stroke_color => 'black');
        Goo::Canvas::Text->new ($tgroup,$count,$x,$y,-1,'GTK_ANCHOR_CE
+NTER',
            font => 'Sans Bold 15',
            fill_color => 'pink',
        );
        print " $count\n";
        
        push @$way_ref,$x,$y;
        
        my $points = Goo::Canvas::Points->new($way_ref);
        $way_lines->set(points => $points);
        $count++;
        print "$way_ref\n";
        return;
    }
    
    #remove waypoints
    if ($event->type eq "button-press" && $event->button == 3){
        my ($x,$y) = ($event->x,$event->y);
        print "right click\n";
        my $items = $canvas->get_item_at($x,$y,TRUE);
        my $parent = $items->get_parent;
        print "$parent\n";
        print $items->get_bounds,"\n";
        $parent->remove;
[\@points]);

}
#------------------------------------------------

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In reply to 32 bit images using Pixbuf by deadpickle

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