make_EPSG: Make a data frame of EPSG projection codes

In rgdal: Bindings for the 'Geospatial' Data Abstraction Library

Make a data frame of EPSG projection codes

Description

Make a data frame of the European Petroleum Survey Group (EPSG) geodetic parameter dataset as distributed with PROJ.4 software (prior to PROJ 6.0.0, March 2019, only the CSV file, from March 2019 with PROJ >= 6 from the SQLite database). Because finding the correct projection specification is not easy, lists still known as EPSG lists are maintained, and more generally retrieved from databases. The data collated here are as distributed with PROJ.4.

Usage

make_EPSG(file)
EPSG_version()

Arguments

file	file name of the file matching EPSG codes and PROJ.4 arguments, should usually be autodetected; not used for PROJ >= 6

Value

returns a data frame with columns:

code	integer column of EPSG code numbers
note	character column of notes as included in the file
prj4	character column of PROJ.4 arguments for the equivalent projection definitions
prj_method	extra character column from PROJ 6 showing the projection method

...

Note

See also Clifford J. Mugnier's Grids & Datums columns in Photogrammetric Engineering & Remote Sensing, https://www.asprs.org/a/resources/grids/, see also GridsDatums.

Author(s)

Roger Bivand

References

(unlinked because of certificate issues: https://epsg.org/home.html.

Examples

EPSG <- try(make_EPSG())
# from PROJ 6.0.0, EPSG data is no longer stored in a flat file
if (!inherits(EPSG, "try-error")) attr(EPSG, "metadata") 
# PROJ.4 version 5 and later include the EPSG version as an attribute
if (!inherits(EPSG, "try-error")) EPSG[grep("Oslo", EPSG$note), 1:2]
if (!inherits(EPSG, "try-error")) EPSG[1925:1927, 3]
if (!inherits(EPSG, "try-error")) EPSG[grep("Poland", EPSG$note), 1:2]
if (!inherits(EPSG, "try-error")) EPSG[grep("Amersfoort", EPSG$note), 1:2]
if (!inherits(EPSG, "try-error")) EPSG[grep("North Carolina", EPSG$note), 1:2]
if (!inherits(EPSG, "try-error")) EPSG[2202, 3]

rgdal documentation built on June 7, 2023, 5:09 p.m.