/**
* Add GPS information to an image basic metadata. Any old Exif data
* is discarded.
*
* @param string the input filename.
*
* @param string the output filename. An updated copy of the input
* image is saved here.
*
* @param string image description.
*
* @param string user comment.
*
* @param string camera model.
*
* @param float longitude expressed as a fractional number of degrees,
* e.g. 12.345°. Negative values denotes degrees west of Greenwich.
*
* @param float latitude expressed as for longitude. Negative values
* denote degrees south of equator.
*
* @param float the altitude, negative values express an altitude
* below sea level.
*
* @param string the date and time.
*/
function addGpsInfo($input, $output, $description, $comment, $model, $longitude, $latitude, $altitude, $date_time)
{
/* Load the given image into a PelJpeg object */
$jpeg = new PelJpeg($input);
/* Create and add empty Exif data to the image (this throws away any
* old Exif data in the image). */
$exif = new PelExif();
$jpeg->setExif($exif);
/* Create and add TIFF data to the Exif data (Exif data is actually
* stored in a TIFF format). */
$tiff = new PelTiff();
$exif->setTiff($tiff);
/* Create first Image File Directory and associate it with the TIFF
* data. */
$ifd0 = new PelIfd(PelIfd::IFD0);
$tiff->setIfd($ifd0);
/* Create a sub-IFD for holding GPS information. GPS data must be
* below the first IFD. */
$gps_ifd = new PelIfd(PelIfd::GPS);
$ifd0->addSubIfd($gps_ifd);
/* The USER_COMMENT tag must be put in a Exif sub-IFD under the
* first IFD. */
$exif_ifd = new PelIfd(PelIfd::EXIF);
$exif_ifd->addEntry(new PelEntryUserComment($comment));
$ifd0->addSubIfd($exif_ifd);
$inter_ifd = new PelIfd(PelIfd::INTEROPERABILITY);
$ifd0->addSubIfd($inter_ifd);
$ifd0->addEntry(new PelEntryAscii(PelTag::MODEL, $model));
$ifd0->addEntry(new PelEntryAscii(PelTag::DATE_TIME, $date_time));
$ifd0->addEntry(new PelEntryAscii(PelTag::IMAGE_DESCRIPTION, $description));
$gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_VERSION_ID, 2, 2, 0, 0));
/* Use the convertDecimalToDMS function to convert the latitude from
* something like 12.34° to 12° 20' 42" */
list($hours, $minutes, $seconds) = convertDecimalToDMS($latitude);
/* We interpret a negative latitude as being south. */
$latitude_ref = $latitude < 0 ? 'S' : 'N';
$gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LATITUDE_REF, $latitude_ref));
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LATITUDE, $hours, $minutes, $seconds));
/* The longitude works like the latitude. */
list($hours, $minutes, $seconds) = convertDecimalToDMS($longitude);
$longitude_ref = $longitude < 0 ? 'W' : 'E';
$gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LONGITUDE_REF, $longitude_ref));
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LONGITUDE, $hours, $minutes, $seconds));
/* Add the altitude. The absolute value is stored here, the sign is
* stored in the GPS_ALTITUDE_REF tag below. */
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_ALTITUDE, array(abs($altitude), 1)));
/* The reference is set to 1 (true) if the altitude is below sea
* level, or 0 (false) otherwise. */
$gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_ALTITUDE_REF, (int) ($altitude < 0)));
/* Finally we store the data in the output file. */
file_put_contents($output, $jpeg->getBytes());
}
/**
* Add GPS information to an image basic metadata. Any old Exif data
* is discarded.
*
* @param string the input filename.
*
* @param string the output filename. An updated copy of the input
* image is saved here.
*
* @param string image description.
*
* @param string user comment.
*
* @param string camera model.
*
* @param float longitude expressed as a fractional number of degrees,
* e.g. 12.345°. Negative values denotes degrees west of Greenwich.
*
* @param float latitude expressed as for longitude. Negative values
* denote degrees south of equator.
*
* @param float the altitude, negative values express an altitude
* below sea level.
*
* @param string the date and time.
*/
function addGpsInfo($input, $description, $comment, $artist, $make, $model, $longitude, $latitude)
{
/* Load the given image into a PelJpeg object */
$jpeg = new PelJpeg($input);
/* Create and add empty Exif data to the image (this throws away any
* old Exif data in the image). */
$exif = new PelExif();
$jpeg->setExif($exif);
/* Create and add TIFF data to the Exif data (Exif data is actually
* stored in a TIFF format). */
$tiff = new PelTiff();
$exif->setTiff($tiff);
/* Create first Image File Directory and associate it with the TIFF
* data. */
$ifd0 = new PelIfd(PelIfd::IFD0);
$tiff->setIfd($ifd0);
/* Create a sub-IFD for holding GPS information. GPS data must be
* below the first IFD. */
$gps_ifd = new PelIfd(PelIfd::GPS);
$ifd0->addSubIfd($gps_ifd);
/* The USER_COMMENT tag must be put in a Exif sub-IFD under the
* first IFD. */
$exif_ifd = new PelIfd(PelIfd::EXIF);
$exif_ifd->addEntry(new PelEntryUserComment($comment));
$ifd0->addSubIfd($exif_ifd);
$inter_ifd = new PelIfd(PelIfd::INTEROPERABILITY);
$ifd0->addSubIfd($inter_ifd);
$ifd0->addEntry(new PelEntryAscii(PelTag::ARTIST, $artist));
$ifd0->addEntry(new PelEntryAscii(PelTag::MAKE, $make));
$ifd0->addEntry(new PelEntryAscii(PelTag::MODEL, $model));
$ifd0->addEntry(new PelEntryAscii(PelTag::IMAGE_DESCRIPTION, $description));
$gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_VERSION_ID, 2, 2, 0, 0));
// Negative numbers indicate different reference then the usual N/E
if ($longitude < 0) {
$longitude_ref = 'W';
} else {
$longitude_ref = 'E';
}
if ($latitude < 0) {
$latitude_ref = 'S';
} else {
$latitude_ref = 'N';
}
list($h, $m, $s) = convertDecimalToDMS($latitude);
$gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LATITUDE_REF, $latitude_ref));
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LATITUDE, $h, $m, $s));
list($h, $m, $s) = convertDecimalToDMS($longitude);
$gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LONGITUDE_REF, $longitude_ref));
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LONGITUDE, $h, $m, $s));
$gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_ALTITUDE, array(0, 0)));
$gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_ALTITUDE_REF, 0));
//print($gps_ifd);
file_put_contents($input, $jpeg->getBytes());
}
