Last data update: 2014.03.03
R: Show Well-Known Text spatial reference system metadata
Show Well-Known Text spatial reference system metadata
Description
Use GDAL/OGR spatial reference objects to convert a PROJ.4 representation to a Well-Known Text representation, and report an EPSG code if it can be determined by OGR SRS services.
Usage
showWKT(p4s, file = NULL, morphToESRI = TRUE)
showP4(wkt, morphFromESRI=TRUE)
showEPSG(p4s)
Arguments
p4s
A valid PROJ.4 string representing a spatial reference system
file
if not NULL, a file name to which the output Well-Known Text representation should be written
morphToESRI
default TRUE, morph the WKT string to the representation used by ESRI
wkt
A valid WKT character string representing a spatial reference system
morphFromESRI
default TRUE, morph the WKT string from the representation used by ESRI
Value
A character string containing the WKT representation of the PROJ.4 string.
Author(s)
Roger Bivand
References
http://www.gdal.org/osr_tutorial.html
See Also
is.projected
, CRS-class
Examples
cities <- readOGR(system.file("vectors", package = "rgdal")[1], "cities")
readLines(system.file("vectors/cities.prj", package = "rgdal")[1])
showWKT(proj4string(cities))
showWKT("+init=epsg:28992")
showP4(showWKT("+init=epsg:28992"))
showEPSG("+proj=utm +zone=30")
showEPSG("+proj=longlat +ellps=WGS84")
Results