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mod_ster: I refresh derived ellipsoid parameters - #4941

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manduinca wants to merge 1 commit into
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manduinca:fix/4932-spherical-modified-stereographic
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manduinca wants to merge 1 commit into
OSGeo:masterfrom
manduinca:fix/4932-spherical-modified-stereographic

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@manduinca

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I refresh the derived ellipsoid parameters in the shared modified stereographic setup after each projection selects its final radius and eccentricity. This keeps the spherical centers at the origin and makes forward and inverse scaling agree. I add two regression tests and clarify the five projection pages.

Fixes #4932.
Fixes #4933.

Offline validation on macOS arm64:

  • Both new regression tests fail on unchanged master and pass with this change.

  • All 72 configured CTest targets pass, including 1,516 GoogleTest cases.

  • AI (Copilot or something similar) supported my development of this PR. See the AI tool policy.

  • Tests added

@mapprehension

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Many thanks for the rapid turn-around, @manduinca.

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