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<div class="">Roger,</div>
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To check if there’s an inverse use proj_pj_info: <a href="https://kbevers.github.io/development/reference/functions.html#c.proj_pj_info" class="">https://kbevers.github.io/development/reference/functions.html#c.proj_pj_info</a> (click
<div class="">PJ_PROJ_INFO to see how the struct is defined)
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<div class="">You can not access P->fwd4d and friends in the public API. That is what the proj_trans* functions are for. The transformation direction is controlled with the PJ_DIRECTION enum.</div>
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<div class="">I’ll try to fit that into the migration guide. Or better yet, you can submit a pull request with the changes you’d like to see.</div>
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<div class="">Kristian</div>
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