Man Pages in libproj-dev

Section 3: Library calls

pj_init.3

Initialize cartographic projection pj_init_plus - initialize cartographic projection pj_fwd - forward cartographic projection pj_inv - inverse cartographic projection pj_transform - transform between coordinate systems pj_free - de-initialize projection

proj.3

Initialize cartographic projection pj_init_plus - initialize cartographic projection pj_fwd - forward cartographic projection pj_inv - inverse cartographic projection pj_transform - transform between coordinate systems pj_free - de-initialize projection