<div dir="ltr"><div>It looks like a somebody didn't find what they needed.</div><div><br></div><div><a href="https://proj.org/en/stable/development/reference/functions.html#c.proj_is_derived_crs">https://proj.org/en/stable/development/reference/functions.html#c.proj_is_derived_crs</a></div><div><a href="https://proj.org/en/stable/development/reference/functions.html#c.proj_crs_is_derived">https://proj.org/en/stable/development/reference/functions.html#c.proj_crs_is_derived</a></div><div><br></div><div>Cheers,</div><div>Javier</div></div>