PC_Transform(pcpatch/pcpoint,pcid) : pcpatch/pcpoint #45
Description
(Replaces #15 and #16 when the transform stack is reduced to a pcid change : srid/scale/offset/interpretation with dropped/added dimensions)
Compared to PC_SetPCID (#44), PC_Transform explicitly looks at the coordinate values to reflect the change of pcid (and srid). This distinction is similar to ST_SetSRID and ST_Transform in postgis.
PC_Transform(pcpatch/pcpoint,pcid) would perform the get/set into doubles (offset/scale/interpretation change), thereby taking scales/offsets into account (already implemented in the current pc_setpcid) and doing the proj4 srid transformation if the srid changes.