#------------------------------------------------------------------------------
# File: GPS.pm
#
# Description: EXIF GPS meta information tags
#
# Revisions: 12/09/2003 - P. Harvey Created
#------------------------------------------------------------------------------
package Image::ExifTool::GPS;
use strict;
use vars qw($VERSION);
use Image::ExifTool::Exif;
$VERSION = '1.34';
my %coordConv = (
ValueConv => 'Image::ExifTool::GPS::ToDegrees($val)',
ValueConvInv => 'Image::ExifTool::GPS::ToDMS($self, $val)',
PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1)',
PrintConvInv => 'Image::ExifTool::GPS::ToDegrees($val)',
);
%Image::ExifTool::GPS::Main = (
GROUPS => { 0 => 'EXIF', 1 => 'GPS', 2 => 'Location' },
WRITE_PROC => \&Image::ExifTool::Exif::WriteExif,
CHECK_PROC => \&Image::ExifTool::Exif::CheckExif,
WRITABLE => 1,
WRITE_GROUP => 'GPS',
0x0000 => {
Name => 'GPSVersionID',
Writable => 'int8u',
Mandatory => 1,
Count => 4,
PrintConv => '$val =~ tr/ /./; $val',
PrintConvInv => '$val =~ tr/./ /; $val',
},
0x0001 => {
Name => 'GPSLatitudeRef',
Writable => 'string',
Count => 2,
PrintConv => {
# extract N/S if written from Composite:GPSLatitude
# (also allow writing from a signed number)
OTHER => sub {
my ($val, $inv) = @_;
return undef unless $inv;
return uc $1 if $val =~ /\b([NS])$/i;
return $1 eq '-' ? 'S' : 'N' if $val =~ /^([-+]?)\d+(\.\d*)?$/;
return undef;
},
N => 'North',
S => 'South',
},
},
0x0002 => {
Name => 'GPSLatitude',
Writable => 'rational64u',
Count => 3,
%coordConv,
},
0x0003 => {
Name => 'GPSLongitudeRef',
Writable => 'string',
Count => 2,
PrintConv => {
# extract E/W if written from Composite:GPSLongitude
# (also allow writing from a signed number)
OTHER => sub {
my ($val, $inv) = @_;
return undef unless $inv;
return uc $1 if $val =~ /\b([EW])$/i;
return $1 eq '-' ? 'W' : 'E' if $val =~ /^([-+]?)\d+(\.\d*)?$/;
return undef;
},
E => 'East',
W => 'West',
},
},
0x0004 => {
Name => 'GPSLongitude',
Writable => 'rational64u',
Count => 3,
%coordConv,
},
0x0005 => {
Name => 'GPSAltitudeRef',
Writable => 'int8u',
PrintConv => {
0 => 'Above Sea Level',
1 => 'Below Sea Level',
},
},
0x0006 => {
Name => 'GPSAltitude',
Writable => 'rational64u',
# extricate unsigned decimal number from string
ValueConvInv => '$val=~/((?=\d|\.\d)\d*(?:\.\d*)?)/ ? $1 : undef',
PrintConv => '$val =~ /^(inf|undef)$/ ? $val : "$val m"',
PrintConvInv => '$val=~s/\s*m$//;$val',
},
0x0007 => {
Name => 'GPSTimeStamp',
Groups => { 2 => 'Time' },
Writable => 'rational64u',
Count => 3,
Shift => 'Time',
Notes => q{
when writing, date is stripped off if present, and time is adjusted to UTC
if it includes a timezone
},
ValueConv => 'Image::ExifTool::GPS::ConvertTimeStamp($val)',
ValueConvInv => '$val=~tr/:/ /;$val',
# pull time out of any format date/time string
# (converting to UTC if a timezone is given)
PrintConvInv => sub {
my $v = shift;
my @tz;
if ($v =~ s/([-+])(.*)//s) { # remove timezone
my $s = $1 eq '-' ? 1 : -1; # opposite sign to convert back to UTC
my $t = $2;
@tz = ($s*$1, $s*$2) if $t =~ /^(\d{2}):?(\d{2})\s*$/;
}
my @a = ($v =~ /((?=\d|\.\d)\d*(?:\.\d*)?)/g);
push @a, '00' while @a < 3;
if (@tz) {
# adjust to UTC
$a[-2] += $tz[1];
$a[-3] += $tz[0];
while ($a[-2] >= 60) { $a[-2] -= 60; ++$a[-3] }
while ($a[-2] < 0) { $a[-2] += 60; --$a[-3] }
$a[-3] = ($a[-3] + 24) % 24;
}
return "$a[-3]:$a[-2]:$a[-1]";
},
},
0x0008 => {
Name => 'GPSSatellites',
Writable => 'string',
},
0x0009 => {
Name => 'GPSStatus',
Writable => 'string',
Count => 2,
PrintConv => {
A => 'Measurement Active', # Exif2.2 "Measurement in progress"
V => 'Measurement Void', # Exif2.2 "Measurement Interoperability" (WTF?)
# (meaning for 'V' taken from status code in NMEA GLL and RMC sentences)
},
},
0x000a => {
Name => 'GPSMeasureMode',
Writable => 'string',
Count => 2,
PrintConv => {
2 => '2-Dimensional Measurement',
3 => '3-Dimensional Measurement',
},
},
0x000b => {
Name => 'GPSDOP',
Description => 'GPS Dilution Of Precision',
Writable => 'rational64u',
},
0x000c => {
Name => 'GPSSpeedRef',
Writable => 'string',
Count => 2,
PrintConv => {
K => 'km/h',
M => 'mph',
N => 'knots',
},
},
0x000d => {
Name => 'GPSSpeed',
Writable => 'rational64u',
},
0x000e => {
Name => 'GPSTrackRef',
Writable => 'string',
Count => 2,
PrintConv => {
M => 'Magnetic North',
T => 'True North',
},
},
0x000f => {
Name => 'GPSTrack',
Writable => 'rational64u',
},
0x0010 => {
Name => 'GPSImgDirectionRef',
Writable => 'string',
Count => 2,
PrintConv => {
M => 'Magnetic North',
T => 'True North',
},
},
0x0011 => {
Name => 'GPSImgDirection',
Writable => 'rational64u',
},
0x0012 => {
Name => 'GPSMapDatum',
Writable => 'string',
},
0x0013 => {
Name => 'GPSDestLatitudeRef',
Writable => 'string',
Count => 2,
PrintConv => {
N => 'North',
S => 'South',
},
},
0x0014 => {
Name => 'GPSDestLatitude',
Writable => 'rational64u',
Count => 3,
%coordConv,
},
0x0015 => {
Name => 'GPSDestLongitudeRef',
Writable => 'string',
Count => 2,
PrintConv => {
E => 'East',
W => 'West',
},
},
0x0016 => {
Name => 'GPSDestLongitude',
Writable => 'rational64u',
Count => 3,
%coordConv,
},
0x0017 => {
Name => 'GPSDestBearingRef',
Writable => 'string',
Count => 2,
PrintConv => {
M => 'Magnetic North',
T => 'True North',
},
},
0x0018 => {
Name => 'GPSDestBearing',
Writable => 'rational64u',
},
0x0019 => {
Name => 'GPSDestDistanceRef',
Writable => 'string',
Count => 2,
PrintConv => {
K => 'Kilometers',
M => 'Miles',
N => 'Nautical Miles',
},
},
0x001a => {
Name => 'GPSDestDistance',
Writable => 'rational64u',
},
0x001b => {
Name => 'GPSProcessingMethod',
Writable => 'undef',
Notes => 'values of "GPS", "CELLID", "WLAN" or "MANUAL" by the EXIF spec.',
RawConv => 'Image::ExifTool::Exif::ConvertExifText($self,$val)',
RawConvInv => 'Image::ExifTool::Exif::EncodeExifText($self,$val)',
},
0x001c => {
Name => 'GPSAreaInformation',
Writable => 'undef',
RawConv => 'Image::ExifTool::Exif::ConvertExifText($self,$val)',
RawConvInv => 'Image::ExifTool::Exif::EncodeExifText($self,$val)',
},
0x001d => {
Name => 'GPSDateStamp',
Groups => { 2 => 'Time' },
Writable => 'string',
Notes => 'YYYY:mm:dd',
Count => 11,
Shift => 'Time',
Notes => q{
when writing, time is stripped off if present, after adjusting date/time to
UTC if time includes a timezone
},
ValueConv => 'Image::ExifTool::Exif::ExifDate($val)',
ValueConvInv => '$val',
# pull date out of any format date/time string
# (and adjust to UTC if this is a full date/time/timezone value)
PrintConvInv => q{
my $secs;
if ($val =~ /[-+]/ and ($secs = Image::ExifTool::GetUnixTime($val, 1))) {
$val = Image::ExifTool::ConvertUnixTime($secs);
}
return $val =~ /(\d{4}).*?(\d{2}).*?(\d{2})/ ? "$1:$2:$3" : undef;
},
},
0x001e => {
Name => 'GPSDifferential',
Writable => 'int16u',
PrintConv => {
0 => 'No Correction',
1 => 'Differential Corrected',
},
},
0x001f => {
Name => 'GPSHPositioningError',
Description => 'GPS Horizontal Positioning Error',
PrintConv => '"$val m"',
PrintConvInv => '$val=~s/\s*m$//; $val',
Writable => 'rational64u',
},
);
# Composite GPS tags
%Image::ExifTool::GPS::Composite = (
GROUPS => { 2 => 'Location' },
GPSDateTime => {
Description => 'GPS Date/Time',
Groups => { 2 => 'Time' },
SubDoc => 1, # generate for all sub-documents
Require => {
0 => 'GPS:GPSDateStamp',
1 => 'GPS:GPSTimeStamp',
},
ValueConv => '"$val[0] $val[1]Z"',
PrintConv => '$self->ConvertDateTime($val)',
},
# Note: The following tags are used by other modules
# which must therefore require this module as necessary
GPSLatitude => {
SubDoc => 1, # generate for all sub-documents
Require => {
0 => 'GPS:GPSLatitude',
1 => 'GPS:GPSLatitudeRef',
},
ValueConv => '$val[1] =~ /^S/i ? -$val[0] : $val[0]',
PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "N")',
},
GPSLongitude => {
SubDoc => 1, # generate for all sub-documents
Require => {
0 => 'GPS:GPSLongitude',
1 => 'GPS:GPSLongitudeRef',
},
ValueConv => '$val[1] =~ /^W/i ? -$val[0] : $val[0]',
PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "E")',
},
GPSAltitude => {
SubDoc => 1, # generate for all sub-documents
Desire => {
0 => 'GPS:GPSAltitude',
1 => 'GPS:GPSAltitudeRef',
2 => 'XMP:GPSAltitude',
3 => 'XMP:GPSAltitudeRef',
},
# Require either GPS:GPSAltitudeRef or XMP:GPSAltitudeRef
RawConv => '(defined $val[1] or defined $val[3]) ? $val : undef',
ValueConv => q{
my $alt = $val[0];
$alt = $val[2] unless defined $alt;
return undef unless defined $alt;
return ($val[1] || $val[3]) ? -$alt : $alt;
},
PrintConv => q{
$val = int($val * 10) / 10;
return ($val =~ s/^-// ? "$val m Below" : "$val m Above") . " Sea Level";
},
},
);
# add our composite tags
Image::ExifTool::AddCompositeTags('Image::ExifTool::GPS');
#------------------------------------------------------------------------------
# Convert GPS timestamp value
# Inputs: 0) raw timestamp value string
# Returns: EXIF-formatted time string
sub ConvertTimeStamp($)
{
my $val = shift;
my ($h,$m,$s) = split ' ', $val;
my $f = (($h || 0) * 60 + ($m || 0)) * 60 + ($s || 0);
$h = int($f / 3600); $f -= $h * 3600;
$m = int($f / 60); $f -= $m * 60;
$s = int($f); $f -= $s;
$f = int($f * 1000000 + 0.5);
if ($f) {
($f = sprintf(".%.6d", $f)) =~ s/0+$//;
} else {
$f = ''
}
return sprintf("%.2d:%.2d:%.2d$f",$h,$m,$s);
}
#------------------------------------------------------------------------------
# Convert degrees to DMS, or whatever the current settings are
# Inputs: 0) ExifTool reference, 1) Value in degrees,
# 2) format code (0=no format, 1=CoordFormat, 2=XMP format)
# 3) 'N' or 'E' if sign is significant and N/S/E/W should be added
# Returns: DMS string
sub ToDMS($$;$$)
{
my ($exifTool, $val, $doPrintConv, $ref) = @_;
my ($fmt, $num);
if ($ref) {
if ($val < 0) {
$val = -$val;
$ref = {N => 'S', E => 'W'}->{$ref};
}
$ref = " $ref" unless $doPrintConv and $doPrintConv eq '2';
} else {
$val = abs($val);
$ref = '';
}
if ($doPrintConv) {
if ($doPrintConv eq '1') {
$fmt = ($exifTool->Options('CoordFormat') || q{%d deg %d' %.2f"}) . $ref;
} else {
$fmt = "%d,%.6f$ref"; # use XMP standard format
}
# count the number of format specifiers
$num = ($fmt =~ tr/%/%/);
} else {
$num = 3;
}
my ($d, $m, $s);
$d = $val;
if ($num > 1) {
$d = int($d);
$m = ($val - $d) * 60;
if ($num > 2) {
$m = int($m);
$s = ($val - $d - $m / 60) * 3600;
}
}
return $doPrintConv ? sprintf($fmt, $d, $m, $s) : "$d $m $s$ref";
}
#------------------------------------------------------------------------------
# Convert to decimal degrees
# Inputs: 0) a string containing 1-3 decimal numbers and any amount of other garbage
# 1) true if value should be negative if coordinate ends in 'S' or 'W'
# Returns: Coordinate in degrees
sub ToDegrees($;$)
{
my ($val, $doSign) = @_;
# extract decimal or floating point values out of any other garbage
my ($d, $m, $s) = ($val =~ /((?:[+-]?)(?=\d|\.\d)\d*(?:\.\d*)?(?:[Ee][+-]\d+)?)/g);
my $deg = ($d || 0) + (($m || 0) + ($s || 0)/60) / 60;
# make negative if S or W coordinate
$deg = -$deg if $doSign ? $val =~ /[^A-Z](S|W)$/i : $deg < 0;
return $deg;
}
1; #end
__END__
=head1 NAME
Image::ExifTool::GPS - EXIF GPS meta information tags
=head1 SYNOPSIS
This module is loaded automatically by Image::ExifTool when required.
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to interpret
GPS (Global Positioning System) meta information in EXIF data.
=head1 AUTHOR
Copyright 2003-2011, Phil Harvey (phil at owl.phy.queensu.ca)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 REFERENCES
=over 4
=item L<Image::Info|Image::Info>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/GPS Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>,
L<Image::Info(3pm)|Image::Info>
=cut