Suggest an alternative to

GCTP

The General Cartographic Transformation Package (GCTP) is a system of software routines designed to permit the transformation of coordinate pairs from one map projection to another.

Why do you think that https://github.com/SFML/SFML is a good alternative to GCTP

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with GCTP. Optional.

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