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I'm reading into how to customise projections with Proj4 - specifically to achieve tilted projections such as the example below (from vis4.net)

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The Proj4 literature is pretty heavy going and having explored it I'm not clear which parameters I'd need to change, or whether a custom datum would need to be defined.

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Define a tilted perspective projection (tpers) using:

  • h: height (in meters) above the surface
  • azi: bearing (in degrees) from due north
  • tilt: angle (in degrees) away from nadir
  • lat_0: latitude (in degrees) of the view position
  • lon_0: longitude (in degrees) of the view position

Putting it all together, here is an example PROJ string for part of Europe:

+proj=tpers +ellps=WGS84 +h=5000000 +azi=30 +tilt=40 +lat_0=20 +lon_0=0

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