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jimjkelly / missile-defense

http://missile.exchange
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Mercator Distortions #15

Open wslafoy opened 7 years ago

wslafoy commented 7 years ago

Circles do not distort with latitude. Low priority, not a big deal since it is just meant for basic simulation, but if easy to implement: http://gis.stackexchange.com/questions/3264/using-geodesic-measurements-for-circle-radii

jimjkelly commented 7 years ago

Ah! Interesting. I suppose that makes sense. I'll have to play around with some of the suggestions there and see what we can come up with.

wslafoy commented 7 years ago

Small addition: when the camera passes over the map seam in the pacific ocean, the circles disappear. This is a super common problem with mapping stuff, my bad!

jimjkelly commented 7 years ago

Ah! Interesting. That's kind of a neat bug. Actually it seems some general badness occurs then, so I'll have to figure out what's going on and fix it.

wslafoy commented 7 years ago

Yeah, there are a lot of really interesting mathematically oddities that happen when data crosses the map seam (almost always in the pacific) and gets to polar regions. On google earth, if you drag a polygon towards the poles, it will slowly deform and spiral, but the system will still see it as linear! Its such an interesting artifact

Fortunately because it is a known and common issue, there will probably be a lot of documentation for fixes