<![CDATA[🧵 1/2: I recently saw this vintage #Qantas poster with a unique “flower” map projection centered on #Sydney (1st image).]]>🧵 1/2: I recently saw this vintage poster with a unique “flower” map projection centered on (1st image). I like how the map almost neatly divides the four largest continents (Eurasia, North America, South America, and Africa) into the four petals.

Well, I kinda became obsessed and wondered if I can recreate it using the mapmaking skill I have.

After some tinkering and mathing I think I was able to do it! (2nd image) 🎉🗺️

]]>https://forum.fedi.dk/topic/9553eec7-3371-4a3c-ac2e-be8874491ab9/1-2-i-recently-saw-this-vintage-qantas-poster-with-a-unique-flower-map-projection-centered-on-sydney-1st-image-.RSS for NodeTue, 29 Sep 2026 02:56:01 GMTMon, 07 Sep 2026 16:43:32 GMT60<![CDATA[Reply to 🧵 1/2: I recently saw this vintage #Qantas poster with a unique “flower” map projection centered on #Sydney (1st image). on Mon, 07 Sep 2026 17:00:55 GMT]]>@IvanSanchez I can’t prove it, but I’m not sure this is equal-area. But if my calculus intuition is correct (infinitesimal slices), it might be!

Also, except for the exact spines of the “petals”, I don’t think this is really equidistant since the radial great circles curve away from the petal spines.

]]>https://forum.fedi.dk/post/https://en.osm.town/users/seav/statuses/117230826653901239https://forum.fedi.dk/post/https://en.osm.town/users/seav/statuses/117230826653901239Mon, 07 Sep 2026 17:00:55 GMT<![CDATA[Reply to 🧵 1/2: I recently saw this vintage #Qantas poster with a unique “flower” map projection centered on #Sydney (1st image). on Mon, 07 Sep 2026 16:57:52 GMT]]>@seav This reminds me of our current atlas in the geography department in school.

]]>https://forum.fedi.dk/post/https://mastodon.social/users/nevarro/statuses/117230814647944623https://forum.fedi.dk/post/https://mastodon.social/users/nevarro/statuses/117230814647944623Mon, 07 Sep 2026 16:57:52 GMT<![CDATA[Reply to 🧵 1/2: I recently saw this vintage #Qantas poster with a unique “flower” map projection centered on #Sydney (1st image). on Mon, 07 Sep 2026 16:54:17 GMT]]>@seav Wait, is this *both* equidistant (from the center) *and* equal-area?

]]>https://forum.fedi.dk/post/https://mastodon.social/users/IvanSanchez/statuses/117230800540542255https://forum.fedi.dk/post/https://mastodon.social/users/IvanSanchez/statuses/117230800540542255Mon, 07 Sep 2026 16:54:17 GMT<![CDATA[Reply to 🧵 1/2: I recently saw this vintage #Qantas poster with a unique “flower” map projection centered on #Sydney (1st image). on Mon, 07 Sep 2026 16:46:41 GMT]]>🧵 2/2: I have no idea what this floral projection is or if it even has a name. I haven’t seen this in any list of map projections. The closest I know is the Gingery projection which is also aviation related:

https://www.jasondavies.com/maps/gingery/ (by @jasondavies)

Normally, an azimuthal equidistant map is used to show great circle distances from a central point. But because shapes are greatly distorted the farther from the center you go, an interrupted projection like Qantas’s or the Gingery could be used.

]]>https://forum.fedi.dk/post/https://en.osm.town/users/seav/statuses/117230770700664670https://forum.fedi.dk/post/https://en.osm.town/users/seav/statuses/117230770700664670Mon, 07 Sep 2026 16:46:41 GMT