I was looking for an exhaustive reference on instructions supported by PROJ string, but couldn't find anything yet. Only this page in PROJ library docs - I guess that's all there is.
I have quite a straightforward goal in mind - convert certain lat/lng to specific UTM (lets say
+proj=utm +zone=18 +datum=WGS84 +units=m +no_defs) and then offset easting and northing by a certain amount. But I want destination to be an actual custom coordinate system. So how do I derive it from that UTM CRS, given above mentioned operations? Should be something trivial, right? How do I do that?
I tried to set false easting and false northing, like this:
+proj=utm +zone=18 +datum=WGS84 +units=m +x_0=-5000 +y_0=-5000 +no_defs
But doesn't seem to have any effect in PostGIS and continues to ST_Transform to mere UTM 18N.