English operator: Panoramio described at URL: https://web.archive.org/web/20161030010115/http://www.panoramio.com/photo/91289575...
English heading: 22.5 degree operator: Panoramio described at URL: https://web.archive.org/web/20161102192857/http://www.panoramio.com/photo/91289484...
English heading: 157.5 degree operator: Panoramio described at URL: https://web.archive.org/web/20161031032341/http://www.panoramio.com/photo/91290110...
English heading: 22.5 degree operator: Panoramio described at URL: https://web.archive.org/web/20161028231925/http://www.panoramio.com/photo/91289391...