fm_crs_wkt: Handling CRS/WKT

Description

Get and set CRS object or WKT string properties.

Usage

fm_wkt_is_geocent(wkt)
fm_crs_is_geocent(crs)
fm_wkt_get_ellipsoid_radius(wkt)
fm_crs_get_ellipsoid_radius(crs)
fm_ellipsoid_radius(x)
# S3 method for default
fm_ellipsoid_radius(x)
# S3 method for character
fm_ellipsoid_radius(x)
fm_wkt_set_ellipsoid_radius(wkt, radius)
fm_ellipsoid_radius(x) <- value
# S3 method for character
fm_ellipsoid_radius(x) <- value
# S3 method for CRS
fm_ellipsoid_radius(x) <- value
# S3 method for fm_CRS
fm_ellipsoid_radius(x) <- value
# S3 method for crs
fm_ellipsoid_radius(x) <- value
# S3 method for fm_crs
fm_ellipsoid_radius(x) <- value
fm_crs_set_ellipsoid_radius(crs, radius)
fm_wkt_unit_params()
fm_wkt_get_lengthunit(wkt)
fm_wkt_set_lengthunit(wkt, unit, params = NULL)
fm_crs_get_lengthunit(crs)
fm_crs_set_lengthunit(crs, unit)
fm_length_unit(x)
# S3 method for default
fm_length_unit(x)
# S3 method for character
fm_length_unit(x)
fm_length_unit(x) <- value
# S3 method for character
fm_length_unit(x) <- value
# S3 method for CRS
fm_length_unit(x) <- value
# S3 method for fm_CRS
fm_length_unit(x) <- value
# S3 method for crs
fm_length_unit(x) <- value
# S3 method for fm_crs
fm_length_unit(x) <- value
fm_wkt(crs)
fm_proj4string(crs)
fm_wkt_tree_projection_type(wt)
fm_wkt_projection_type(wkt)
fm_crs_projection_type(crs)
fm_crs_bounds(crs, warn.unknown = FALSE)
# S3 method for inla.CRS
fm_ellipsoid_radius(x) <- value
# S3 method for inla.CRS
fm_length_unit(x) <- value

Value

For fm_wkt_unit_params, a list of named unit definitions

For fm_wkt_get_lengthunit, a list of length units used in the wkt string, excluding the ellipsoid radius unit.

For fm_wkt_set_lengthunit, a WKT2 string with altered length units. Note that the length unit for the ellipsoid radius is unchanged.

For fm_crs_get_lengthunit, a list of length units used in the wkt string, excluding the ellipsoid radius unit.

For fm_length_unit<-, a crs object with altered length units. Note that the length unit for the ellipsoid radius is unchanged.

Arguments

wkt: A WKT2 character string
crs: An sf::crs, sp::CRS, fm_crs or inla.CRS object
x: crs object to extract value from or assign values in
radius: numeric; The new radius value
value: Value to assign
unit: character, name of a unit. Supported names are "metre", "kilometre", and the aliases "meter", "m", International metre", "kilometer", and "km", as defined by fm_wkt_unit_params or the params argument.
params: Length unit definitions, in the list format produced by fm_wkt_unit_params(), Default: NULL, which invokes fm_wkt_unit_params()
wt: A parsed wkt tree, see fm_wkt_as_wkt_tree()
warn.unknown: logical, default FALSE. Produce warning if the shape of the projection bounds is unknown.

Functions

fm_wkt(): Returns a WKT2 string, for any input supported by fm_crs().
fm_proj4string(): Returns a proj4 string, for any input supported by fm_crs().
fm_wkt_tree_projection_type(): Returns "longlat", "lambert", "mollweide", "hammer", "tmerc", or NULL
fm_wkt_projection_type(): See fm_wkt_tree_projection_type
fm_crs_projection_type(): See fm_wkt_tree_projection_type
fm_crs_bounds(): Returns bounds information for a projection, as a list with elements type ("rectangle" or "ellipse"), xlim, ylim, and polygon.

Author

Finn Lindgren Finn.Lindgren@gmail.com

Examples

Run this code

c1 <- fm_crs("globe")
fm_length_unit(c1)
fm_length_unit(c1) <- "m"
fm_length_unit(c1)

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