Sets or retrieves projection attributes on classes extending SpatialData; set or retrieve option value for error or warning on exceedance of geographical coordinate range, set or retrieve option value for exceedance tolerance of geographical coordinate range. Note that only “+proj=longlat +ellps=WGS84” is accepted for geographical coordinates, which must be ordered (eastings, northings); the “+ellps=” definition must be given (or expanded internally from a given “+datum=” value) for recent versions of the PROJ.4 library, and should be set to an appropriate value.
is.projected(obj)
proj4string(obj)
proj4string(obj) <- value
get_ll_warn()
get_ll_TOL()
get_ReplCRS_warn()
set_ll_warn(value)
set_ll_TOL(value)
set_ReplCRS_warn(value)An object of class or extending Spatial-class
For proj4string CRS object, containing a valid proj4 string; attempts to assign an object containing “longlat” to data extending beyond longitude [-180, 360] or lattitude [-90, 90] will be stopped. For set_ll_warn a single logical value, if FALSE (default) error on range exceedance, if TRUE, warning. For set_ll_TOL the value of the power of .Machine$double.eps (default 0.25) to use as tolerance in testing range exceedance. set_ReplCRS_warn may be used to turn off warnings issued when changing object CRS with the proj4string replacement method (by setting value=FALSE).
is.projected returns a logical that may be NA;
proj4string returns a character vector of length 1.
proj4 strings are operative through CRAN package rgdal. For strings defined as “longlat”, the minimum longitude should be -180, the maximum longitude 360, the minimum latitude -90, and the maximum latitude 90. Note that the proj4string replacement method does not project spatial data - for this use spTransform methods in the rgdal package.