Spherical geometry is the geometry of the two-dimensional surface of a sphere.

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Converting Lat/Lon to Pixel-XY on cropped map?

I have a GPX-Track containing LatLon coordinates based on WGS84. The track should be drawn on a cropped map, and for this, I need the pixel coordinates. The map tiles are from OSM I'm not quite sure ...
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Specifying a rectangle as two latitude/longitude pairs, one for center and one for size

I am trying to make sense of the Google S2 library for spherical math (it works like this). I need to get a rectangle for searching for nearby entities in a database, based on a point and a distance (...