projInfo: List PROJ.4 tag information

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

List PROJ.4 tag information

Description

The projInfo function lists known values and descriptions for PROJ.4 tags for tag in c("proj", "ellps", "datum", "units"); getPROJ4VersionInfo returns the version of the underlying PROJ.4 release, getPROJ4libPath returns the value of the PROJ_LIB environment variable, projNAD detects the presence of NAD datum conversion tables (looking for conus).

Usage

projInfo(type = "proj")
getPROJ4VersionInfo()
getPROJ4libPath()
projNAD()
GDAL_OSR_PROJ()
GDALis3ormore()
PROJis6ormore()
new_proj_and_gdal()

Arguments

type	One of these tags: c("proj", "ellps", "datum", "units")

Details

The output data frame lists the information given by the proj application with flags -lp, -le, -ld or -lu. From PROJ 6, "datum" is not available. From PROJ 7.1.0, "units" returns the conversion factor as numeric, not character.

Value

A data frame with a name and description column, and two extra columns for the "ellps" and "datum" tags.

Note

Loading the rgdal package may change the PROJ_LIB environmental variable to the PROJ.4 support files if bundled with binary packages.

Author(s)

Roger Bivand [e-mail]

References

https://proj.org/

Examples

getPROJ4VersionInfo()
projInfo()
projInfo("ellps")
projInfo("units")

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