rgdal (version 1.5-23)

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")

Value

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

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.

References

https://proj.org/

Examples

# NOT RUN {
getPROJ4VersionInfo()
projInfo()
projInfo("ellps")
projInfo("units")
# }