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Handling CRS/WKT

Source: R/fmesher_crs.R
fm_crs_wkt.Rd

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 inla.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 inla.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_crs_get_wkt(crs)

fm_wkt_tree_projection_type(wt)

fm_wkt_projection_type(wkt)

fm_crs_projection_type(crs)

fm_crs_bounds(crs, warn.unknown = FALSE)

fm_crs_detect_manifold(crs)

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. (For legacy PROJ4 use, only "m" and "km" are supported)

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.

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 legacy PROJ4 code, the raw units from the proj4string are returned, if present.)

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

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_crs_get_wkt(): [Deprecated] Use fm_wkt() instead.

  • 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.

  • fm_crs_detect_manifold(): Detect if a crs is on "R2" or "S2" (if fm_crs_is_geocent(crs) is TRUE)

See also

fm_crs()

Author

Finn Lindgren finn.lindgren@gmail.com

Examples

if (FALSE) {
c1 <- fm_crs("globe")
fm_crs_get_lengthunit(c1)
c2 <- fm_crs_set_lengthunit(c1, "m")
fm_crs_get_lengthunit(c2)
}