proj_crs_text: Generate a projection string.

In PROJ: Generic Coordinate System Transformations Using 'PROJ'

Generate a projection string.

Description

Input any accepted format of 'PROJ' coordinate reference system specification. Return value is a string in the requested format.

Usage

proj_crs_text(source, format = 0L)

Arguments

source	input projection specification one of ('PROJ4', 'WKT2', 'EPSG', 'PROJJSON', ... see the library documentation link in Details)
format	integer, 0 for 'WKT', 1 for 'PROJ', 2 for 'PROJJSON'

Details

This function requires PROJ version 6.0 or higher to be useful. If not, this function simply returns 'NA'.

See the library documentation for details on input and output formats.

Value

character string in requested format

warning

Note that a PROJ string is not a full specification, in particular this means that a string like "+proj=laea" cannot be converted to full WKT, because it is technically a transformation step not a crs. To get the full WKT form use a string like "+proj=laea +type=crs".

Examples

cat(proj_crs_text("EPSG:4326", format = 0L))
proj_crs_text("EPSG:4326", format = 1L)
south55 <- "+proj=utm +zone=55 +south +ellps=GRS80 +units=m +no_defs +type=crs"
proj_crs_text(proj_crs_text(south55), 1L)

PROJ documentation built on April 3, 2025, 9:23 p.m.