rgdal: projInfo – R documentation

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projInfo

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 Roger.Bivand@nhh.no

References

https://proj.org/

Examples

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

rgdal

Bindings for the 'Geospatial' Data Abstraction Library

v1.5-23

GPL (>= 2)

Authors

Roger Bivand [cre, aut] (<https://orcid.org/0000-0003-2392-6140>), Tim Keitt [aut], Barry Rowlingson [aut, ctb], Edzer Pebesma [ctb], Michael Sumner [ctb], Robert Hijmans [ctb], Daniel Baston [ctb], Even Rouault [cph, ctb], Frank Warmerdam [cph, ctb], Jeroen Ooms [ctb], Colin Rundel [ctb]

Initial release

2021-02-03