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#!/usr/bin/perl
###############################################################################
#
# Portions Copyright (C) 2000-2026 The Xastir Group
#
# Script to convert a GeoPDF file with included neatline into a collar-stripped
# geotiff in EPSG:4326 projection (WGS84 equidistant cylindrical) in 8-bit
# color.
#
# You must have installed GDAL/OGR, configured to use python in order to use
# this script. This is because the script attempts to run rgb2pct.py, which
# is only installed if you've built GDAL with python support.
#
# This also depends on the -cutline and -crop_to_cutline features of
# gdalwarp, which are only present in versions of GDAL after 1.8.1.
#
# Last Edit:$Date$
# Revision:$Revision$
# Last Edited By: $Author$
###############################################################################
use Getopt::Long;
my $fudgeNeatline;
$result=GetOptions("fixneatline|f"=>\$fudgeNeatline);
# Input file is a geopdf:
if ($#ARGV<0)
{
print STDERR "Usage: $0 <geopdfname>\n";
exit 1;
}
my $inputPDF=$ARGV[0];
if (! -e $inputPDF)
{
print STDERR "File $inputPDF does not exist.\n";
exit 1;
}
open GDALINFO, "gdalinfo $inputPDF |" or die "can't fork $!";
my $readingCoordSys=0;
my $coordSys="";
my $readingMetadata=0;
my $neatlinePoly="";
my $minLat=360,$maxLat=-360,$minLon=360,$maxLon=-360,$templat,$templon;
while (<GDALINFO>)
{
if (/^Driver: (.*)$/)
{
if ($1 ne "PDF/Geospatial PDF")
{
print STDERR "This script is intended to run only on GeoPDF input files.\n";
exit 1;
}
next;
}
if (/^Coordinate System is:/)
{
$readingCoordSys=1;
next;
}
if ($readingCoordSys == 1)
{
# This is tricky --- finding the end of the coordinate system
# means looking for the first line that starts in column 1 that isn't
# the first line of the coordinate system. All lines of the coordinate
# system other than the first start with space.
if (/^[^ ]/ && $coordSys ne "")
{
$readingCoordSys=0;
next;
}
else
{
chomp($_);
$coordSys .= $_;
next;
}
}
if (/^Metadata:/)
{
$readingMetadata=1;
next;
}
if ($readingMetadata==1)
{
if (/^Corner Coordinates:/)
{
$readingMetadata=0;
next;
}
if (/^ *NEATLINE=(.*)$/)
{
$neatlinePoly=$1;
next;
}
}
if (/^Band ([0-9]+).*Type=([^,]*)/)
{
$bandinfo[$#bandinfo+1]=$2;
next;
}
if (/^(Upper|Lower) (Left|Right)/)
{
s/(Upper|Lower) (Left|Right) *\([^)]*\) *//;
/\(([^,]*), *([^\)]*)\)/;
$templonstr=$1;
$templatstr=$2;
$templonstr =~ /([0-9]*)d( *[0-9]*)'( *[0-9.]*)"([EW])/;
$deg=$1; $min=$2; $sec=$3; $hem=$4;
$templon=$deg+$min/60+$sec/3600;
$templon *= -1 if ($hem eq "W");
$minLon=$templon if ($templon<$minLon);
$maxLon=$templon if ($templon>$maxLon);
$templatstr =~ /([0-9]*)d( *[0-9]*)'( *[0-9.]*)"([NS])/;
$deg=$1; $min=$2; $sec=$3; $hem=$4;
$templat=$deg+$min/60+$sec/3600;
$templat *= -1 if ($hem eq "S");
$minLat=$templat if ($templat<$minLat);
$maxLat=$templat if ($templat>$maxLat);
}
}
close GDALINFO;
if (! $fudgeNeatline)
{
# Create a CSV for the neatline. OGR will recognize this geometry
open CSVFILE, ">$inputPDF.csv";
print CSVFILE "foo,WKT\n";
print CSVFILE "bar,\"$neatlinePoly\"\n";
close CSVFILE;
# Unfortunately, there's no easy way to attach a spatial reference system
# (SRS) to the csv file so that gdalwarp will recognize it. So make a
# virtual layer out of the CSV with the reference system in it.
open VRTFILE, ">$inputPDF.vrt";
print VRTFILE "<OGRVRTDataSource>\n";
print VRTFILE " <OGRVRTLayer name=\"$inputPDF\">\n";
print VRTFILE " <LayerSRS>$coordSys</LayerSRS>\n";
print VRTFILE " <SrcDataSource>$inputPDF.csv</SrcDataSource>\n";
print VRTFILE " <GeometryType>wkbPolygon</GeometryType>\n";
print VRTFILE " <GeometryField>WKT</GeometryField>\n";
print VRTFILE " </OGRVRTLayer>\n";
print VRTFILE "</OGRVRTDataSource>\n";
close VRTFILE;
}
else
{
print "User asked us to fudge the neatline, finding nearest 7.5 minute quad boundaries\n";
# Instead of using the neatline specified, round it to nearest 7.5'
# quad boundary
$left=(int((abs($minLon)-int(abs($minLon)))/.125+.5)*.125+int(abs($minLon)))*($minLon/abs($minLon));
$right=(int((abs($maxLon)-int(abs($maxLon)))/.125+.5)*.125+int(abs($maxLon)))*($maxLon/abs($maxLon));
if ($maxLon<0)
{
$temp=$left;
$left=$right;
$right=$temp;
}
$bottom=(int((abs($minLat)-int(abs($minLat)))/.125+.5)*.125+int(abs($minLat)))*($minLat/abs($minLat));
$top=(int((abs($maxLat)-int(abs($maxLat)))/.125+.5)*.125+int(abs($maxLat)))*($maxLat/abs($maxLat));
if ($maxLat<0)
{
$temp=$top;
$top=$bottom;
$bottom=$temp;
}
open CSVFILE, ">$inputPDF.csv";
print CSVFILE "foo,WKT\n";
print CSVFILE "bar,\"POLYGON(($left $top,$right $top, $right $bottom, $left $bottom, $left $top))\"\n";
close CSVFILE;
# Unfortunately, there's no easy way to attach a spatial reference system
# (SRS) to the csv file so that gdalwarp will recognize it. So make a
# virtual layer out of the CSV with the reference system in it.
open VRTFILE, ">$inputPDF.vrt";
print VRTFILE "<OGRVRTDataSource>\n";
print VRTFILE " <OGRVRTLayer name=\"$inputPDF\">\n";
print VRTFILE " <LayerSRS>EPSG:4326</LayerSRS>\n";
print VRTFILE " <SrcDataSource>$inputPDF.csv</SrcDataSource>\n";
print VRTFILE " <GeometryType>wkbPolygon</GeometryType>\n";
print VRTFILE " <GeometryField>WKT</GeometryField>\n";
print VRTFILE " </OGRVRTLayer>\n";
print VRTFILE "</OGRVRTDataSource>\n";
close VRTFILE;
}
# The VRT virtual source will now appear to gdal warp as a complete
# specification of the neatline, with both coordinates *AND* description of
# the coordinate system. This will enable gdalwarp to do the clipping of the
# neatline *AND* conversion to a different coordinate system in the same
# operation. Had we not done the vrt, gdalwarp would have assumed the
# neatline to be in the coordinates of the DESTINATION raster, not the
# source raster.
$outputTif=$inputPDF;
$outputTif =~ s/pdf/tif/i;
# We will warp from whatever the coordinate system is into EPSG:4326, the
# coordinate system that requires the least work and involves the fewest
# approximations from Xastir.
#$theGdalWarp="gdalwarp -cutline $inputPDF.vrt -crop_to_cutline -t_srs EPSG:4326 -co \"COMPRESS=PACKBITS\" $inputPDF $outputTif";
$theGdalWarp="gdalwarp -cutline $inputPDF.vrt -crop_to_cutline -t_srs EPSG:4326 $inputPDF $outputTif";
system ($theGdalWarp) == 0 or die "System $theGdalWarp failed: $?";
if ($#bandinfo>0)
{
print "This is a multi-band raster, dithering...\n";
system ("mv $outputTif $$.tif");
# $theRGB2PCT="rgb2pct.py $$.tif $$-2.tif";
$theRGB2PCT="rgb2pct.py $$.tif $outputTif";
system ($theRGB2PCT) == 0 or die "Could not run rgb2pct: $?";
# system("gdal_translate -co \"COMPRESS=PACKBITS\" $$-2.tif $outputTif") == 0 or die "Could not gdal_translate: $?";
system("rm -f $$.tif $$-2.tif");
}
# now clean up our mess:
system ("rm $inputPDF.csv $inputPDF.vrt");
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