Tool Name	Single Coordinate Transformation
Tool ID	29
Library ID	pj_proj4
Version	1.0
Author(s)	O.Conrad (c) 2018

Transformation of a single coordinate. Projections can be defined in different formats. Supported formats are:

proj strings
WKT strings
object codes (e.g. "EPSG:4326", "ESRI:31493", "urn:ogc:def:crs:EPSG::4326", "urn:ogc:def:coordinateOperation:EPSG::1671")
object names (e.g. "WGS 84", "WGS 84 / UTM zone 31N", "Germany_Zone_3". In this case as uniqueness is not guaranteed, heuristics are applied to determine the appropriate best match.
OGC URN combining references for compound CRS (e.g "urn:ogc:def:crs,crs:EPSG::2393,crs:EPSG::5717" or custom abbreviated syntax "EPSG:2393+5717")
OGC URN combining references for concatenated operations (e.g. "urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618")
PROJJSON strings (find the jsonschema at proj.org)
compound CRS made from two object names separated with " + " (e.g. "WGS 84 + EGM96 height")

Projection routines make use of the PROJ generic coordinate transformation software.
PROJ Version is 9.8.1
PROJ Homepage

Name	Type	Identifier	Constraints
Options
Projection	text	SOURCE_CRS	Default: EPSG:4326
X	floating point number	SOURCE_X	Default: 0.000000
Y	floating point number	SOURCE_Y	Default: 0.000000
Projection	text	TARGET_CRS	Default: EPSG:4326
X	floating point number	TARGET_X	Default: 0.000000
Y	floating point number	TARGET_Y	Default: 0.000000
WKT2	text	SOURCE_WKT2
PROJ	text	SOURCE_PROJ
WKT2	text	TARGET_WKT2
PROJ	text	TARGET_PROJ