gistfile1.txt

var EXIFGPSParser = function(exifData) {
  this.exif = exifData;

  this.getDecimalLatitude = function() {
    return this._DMStoDecimal(this.exif.GPSLatitude, this.exif.GPSLatitudeRef, 'S');
  };

  this.getDecimalLongitude = function() {
    return this._DMStoDecimal(this.exif.GPSLongitude, this.exif.GPSLongitudeRef, 'W');
  };

  this._DMStoDecimal = function(coords, coordRef, negativeCoordRef) {
    if (!coords) {
      return null;
    }

    var deg  = coords[0];
    var mins = coords[1];
    var sec  = coords[2];

    var decimalSeconds = sec / 60.0
    var decimalMins = (mins / 60.0) + decimalSeconds;

    var decimalDegrees = deg + decimalMins;

    if (coordRef === negativeCoordRef) {
      decimalDegrees = -decimalDegrees;
    }

    return decimalDegrees;
  };
};