Wow, some of the distortions at the end of the article are really mind bending...

For simpler fisheye and defisheye effects, I wrote this web based tool a few years ago which some may find useful!

https://jywarren.github.io/fisheyegl/example/

:-) fun. Tnx for sharing.

Bluetooth: tenth-century king Harald Bluetooth united dissonant Danish tribes into a single kingdom. (re: uniting communication protocols)

I guess it's not so surprising bc why the heck is it named after a tooth (had been thinking... the shape of a Bluetooth dongle? Lol) but still, this is a pretty obscure ref.

Also the Bluetooth "logo" is actually just the signet of king Bluetooth.

Leaflet.BlurredLocation https://github.com/publiclab/leaflet-blurred-location - A Leaflet-based HTML interface for selecting a "blurred" or low-resolution location, to preserve privacy.

H3 is similar and cool, but this builds a similar nested grid concept around latitude/longitude, which can map to existing coordinate systems and database storage.

Also note that population density affects how effective a given precision "blur" is for an area; we're also hoping to develop a web service or library to roughly return population density for any given region of the globe.

Thanks folks for the great links and articles related to the question - very helpful!

Leaflet.BlurredLocation https://github.com/publiclab/leaflet-blurred-location

^ based on Hypriot project, each pull request against our repository generates a prebuilt SD card image based on vanilla Raspbian: https://github.com/publiclab/pi-builder/pulls/

Reproducible SD card images: downloads and boots Raspbian, runs recipe, re-generates .img file in about 10m. Recipes welcome!