What is exactly the "globe" projection?

[jjimenezshaw]

In this post https://floss.social/@bart/113424884295371526 Bart mentions the globe-to-mercator projection 👍

I would like to know how it is working.

• Is the "globe" part like this?
  ref: https://github.com/d3/d3-geo-projection?tab=readme-ov-file#geoSatellite
  implementation code: https://github.com/d3/d3-geo-projection/blob/main/src/satellite.js
  example: https://observablehq.com/@d3/satellite-explorer (maplibre does not use the tilt I guess)
• if not, what is the "projection" behind?
• is there any transition to the Mercator projection (like a linear interpolation or whatever)

Thanks

PS. I tried to understand the code in https://github.com/maplibre/maplibre-gl-js/blob/main/src/geo/projection/globe_transform.ts but I am not that fluent in that environment to find the math behind.

[HarelM]

This is currently in "discussion" here:
maplibre/maplibre-style-spec#888

We are making the projection specification a bit more clear, hopefully.