described at URL: https://web.archive.org/web/20161019210801/http://www.panoramio.com/photo/62550827 heading: 22.5 degree determination method: SHA-1...
at URL: https://web.archive.org/web/20161021132614/http://www.panoramio.com/photo/62550788 heading: 45 degree determination method or standard: SHA-1...
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