var exif = new ExifInterface(App._file.AbsolutePath);
 string lon = ExifInterface.TagGpsLongitude;
 string lon_data = exif.GetAttribute(lon);
 longitude_coord = FormatAsCoordinate(lon_data);
 string lat = ExifInterface.TagGpsLatitude;
 string lat_data = exif.GetAttribute(lat);
 latitude_coord = FormatAsCoordinate(lat_data);

 public string FormatAsCoordinate(string unformattedCoordinate)
 {
    if (string.IsNullOrEmpty(unformattedCoordinate))
        return "";
    else
      {
        char divider = '/';
        char divider2 = ',';
        var strings = unformattedCoordinate.Split(divider);
        var strings1 = strings[1].Split(divider2);
        var strings2 = strings[2].Split(divider2);
        var numSeconds = (Convert.ToDouble(strings1[1]) * 60 + Convert.ToDouble(strings2[1]));
        double seconds = 0;
        try
          {
            seconds = numSeconds / 3600;
            seconds = Math.Round(seconds, 6, MidpointRounding.AwayFromZero);
          }
        catch
          {
            seconds = 0;
          }
        var coordinate = (Convert.ToDouble(strings[0])) + seconds;
        return (coordinate - 1).ToString();
     }
  }