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Editorial Team
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Asked: 2026-05-20T16:26:26+00:00

I am writing GPS coordinates to my JPEG image, and the coordinates are correct

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I am writing GPS coordinates to my JPEG image, and the coordinates are correct (as demonstrated by my logcat output) but it appears that it’s being corrupted somehow. Reading the exif data results in either null values or, in the case of my GPS: 512.976698 degrees, 512.976698 degrees. Can anyone shed some light on this problem?

writing it:

        try {
            ExifInterface exif = new ExifInterface(filename);
            exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, latitude);
            exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, longitude);
            exif.saveAttributes();
            Log.e("LATITUDE: ", latitude);
            Log.e("LONGITUDE: ", longitude);


        } catch (IOException e) {
            e.printStackTrace();
        }

and reading it:

        try {
            ExifInterface exif = new ExifInterface("/sdcard/globetrotter/mytags/"+ TAGS[position]);
            Log.e("LATITUDE EXTRACTED", exif.getAttribute(ExifInterface.TAG_GPS_LATITUDE));
            Log.e("LONGITUDE EXTRACTED", exif.getAttribute(ExifInterface.TAG_GPS_LONGITUDE));
        } catch (IOException e) {
            e.printStackTrace();
        }

It goes in (for example) 37.715183, -117.260489 and comes out 33619970/65540, 14811136/3368550, 33619970/65540, 14811136/3368550. Am I doing it wrong?

EDIT:

So, the problem is I am not encoding it in the properly defined format, which is something like you see here:

enter image description here

Can anyone explain what this format is? Obviously the first number is 22/1 = 22 degrees, but I can’t figure out how to compute the decimal there.

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1 Answer

  1. Editorial Team

    GPSLatitude

    Indicates the latitude. The latitude is expressed as three
    RATIONAL values giving the degrees,
    minutes, and seconds, respectively.
    If latitude is expressed as degrees,
    minutes and seconds, a typical format
    would be dd/1,mm/1,ss/1. When degrees
    and minutes are used and, for
    example, fractions of minutes are
    given up to two decimal places, the
    format would be dd/1,mmmm/100,0/1.

    https://docs.google.com/viewer?url=http%3A%2F%2Fwww.exif.org%2FExif2-2.PDF

    The Android docs specify this without explanation: http://developer.android.com/reference/android/media/ExifInterface.html#TAG_GPS_LATITUDE

    Exif data is standardized, and GPS data must be encoded using geographical coordinates (minutes, seconds, etc) described above instead of a fraction. Unless it’s encoded in that format in the exif tag, it won’t stick.

    How to encode: http://en.wikipedia.org/wiki/Geographic_coordinate_conversion

    How to decode: http://android-er.blogspot.com/2010/01/convert-exif-gps-info-to-degree-format.html

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