I work on visualizing Earth Science datasets and often the most
(or only) way to import global data images into general purpose 3D
programs is to put the data into an Equirectangular projection. For
datasets such as sea ice or ozone, where it would be inconvenient to
the data of interest in the most distorted part of the map, I've been
two oblique forms. One has either 90 or -90 as the latitude of
the other keeps lon=0,lat=0 as the origin but rotates/skews 90 degrees
about the origin.
Is there any way to encode this type of projection in geotiff tags?