determination method or standard: SHA-1 operator: Panoramio described at URL: https://web.archive.org/web/20161101102321/http://www.panoramio.com/photo/128471950...
determination method or standard: SHA-1 operator: Panoramio described at URL: https://web.archive.org/web/20161028074604/http://www.panoramio.com/photo/109511482...