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Thread: extract GPS data

  1. #1
    Join Date
    Jan 2008
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    Default extract GPS data

    i am trying to get lat, long numbers from images that have geo tags using
    exif_read_data();
    i found this code and people say that it works well but its producing errors for me
    Code:
    Undefined index: GPSLongitude
    Undefined index: GPSLongitudeRef
    Undefined index: GPSLatitude
    Undefined index: GPSLatitudeRef
    Code:
    function getGps($exifCoord, $hemi) {
    
        $degrees = count($exifCoord) > 0 ? gps2Num($exifCoord[0]) : 0;
        $minutes = count($exifCoord) > 1 ? gps2Num($exifCoord[1]) : 0;
        $seconds = count($exifCoord) > 2 ? gps2Num($exifCoord[2]) : 0;
    
        $flip = ($hemi == 'W' or $hemi == 'S') ? -1 : 1;
    
        return $flip * ($degrees + $minutes / 60 + $seconds / 3600);
    
    }
    
    function gps2Num($coordPart) {
    
        $parts = explode('/', $coordPart);
    
        if (count($parts) <= 0)
            return 0;
    
        if (count($parts) == 1)
            return $parts[0];
    
        return floatval($parts[0]) / floatval($parts[1]);
    }
    
    
    
    $filename = "IMG_1406.jpeg";
    $exif = exif_read_data($filename, 'IDF0');
    $lon = getGps($exif["GPSLongitude"], $exif['GPSLongitudeRef']);
    $lat = getGps($exif["GPSLatitude"], $exif['GPSLatitudeRef']);
    var_dump($lat, $lon);
    also, i made sure in my php.ini
    extension=php_mbstring.dll
    extension=php_exif.dll

    and not:

    extension=php_exif.dll
    extension=php_mbstring.dll

    any suggestions on how to get this to work please
    thank you


    re: just found out that it was the jpg
    images with geo tag will output lat/long coordinates correctly
    Last edited by ggalan; 03-01-2012 at 01:11 PM.

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