| 1 | <?php |
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| 2 | /*********************************************** |
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| 3 | * File : functions_metadata.php |
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| 4 | * Project : piwigo-openstreetmap |
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| 5 | * Descr : Read Geotag Metdata |
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| 6 | * Base on : RV Maps & Earth plugin |
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| 7 | * |
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| 8 | * Created : 30.05.2013 |
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| 9 | * |
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| 10 | * Copyright 2013 <xbgmsharp@gmail.com> |
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| 11 | * |
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| 12 | * This program is free software: you can redistribute it and/or modify |
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| 13 | * it under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation, either version 3 of the License, or |
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| 15 | * (at your option) any later version. |
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| 16 | * |
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| 17 | * This program is distributed in the hope that it will be useful, |
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| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 20 | * GNU General Public License for more details. |
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| 21 | * |
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| 22 | * You should have received a copy of the GNU General Public License |
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| 23 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 24 | * |
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| 25 | ************************************************/ |
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| 26 | |
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| 27 | function osm_parse_fract( $f ) |
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| 28 | { |
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| 29 | $nd = explode( '/', $f ); |
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| 30 | return $nd[0] ? ($nd[0]/$nd[1]) : 0; |
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| 31 | } |
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| 32 | |
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| 33 | function osm_parse_lat_lon( $arr ) |
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| 34 | { |
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| 35 | $v=0; |
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| 36 | $v += osm_parse_fract( $arr[0] ); |
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| 37 | $v += osm_parse_fract( $arr[1] )/60; |
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| 38 | $v += osm_parse_fract( $arr[2] )/3600; |
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| 39 | return $v; |
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| 40 | } |
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| 41 | |
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| 42 | function osm_exif_to_lat_lon( $exif ) |
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| 43 | { |
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| 44 | $exif = array_intersect_key( $exif, array_flip( array('GPSLatitudeRef', 'GPSLatitude', 'GPSLongitudeRef', 'GPSLongitude') ) ); |
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| 45 | if ( count($exif)!=4 ) |
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| 46 | return ''; |
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| 47 | if ( !in_array($exif['GPSLatitudeRef'], array('S', 'N') ) ) |
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| 48 | return 'GPSLatitudeRef not S or N'; |
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| 49 | if ( !in_array($exif['GPSLongitudeRef'], array('W', 'E') ) ) |
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| 50 | return 'GPSLongitudeRef not W or E'; |
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| 51 | if (!is_array($exif['GPSLatitude']) or !is_array($exif['GPSLongitude']) ) |
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| 52 | return 'GPSLatitude and GPSLongitude are not arrays'; |
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| 53 | |
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| 54 | $lat = osm_parse_lat_lon( $exif['GPSLatitude'] ); |
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| 55 | if ( $exif['GPSLatitudeRef']=='S' ) |
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| 56 | $lat = -$lat; |
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| 57 | $lon = osm_parse_lat_lon( $exif['GPSLongitude'] ); |
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| 58 | if ( $exif['GPSLongitudeRef']=='W' ) |
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| 59 | $lon = -$lon; |
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| 60 | return array ($lat,$lon); |
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| 61 | } |
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| 62 | |
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| 63 | ?> |
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