Special coordinate mappings for fm_mesh_2d projections.

Calculates coordinate mappings for spherical fm_mesh_2d projections. This is an internal function not intended for general use.

Usage

fm_mesh_2d_map(loc, projection = NULL, inverse = TRUE)

fm_mesh_2d_map_lim(loc = NULL, projection = NULL)

Arguments

loc: Coordinates to be mapped.
projection: The projection type. One of NULL, "default", "longlat", "longsinlat", or "mollweide".
inverse: If TRUE, loc are map coordinates and coordinates in the spherical domain are calculated. If FALSE, loc are coordinates in the spherical domain and the forward map projection is calculated. Default: TRUE

Value

For fm_mesh_2d_map_lim, a list:

xlim: X axis limits in the map domain
ylim: Y axis limits in the map domain

No attempt is made to find minimal limits for partial spherical domains.

Functions

fm_mesh_2d_map_lim(): Projection extent limit calculations

Author

Finn Lindgren Finn.Lindgren@gmail.com

Examples

(loc <- fm_mesh_2d_map(cbind(20, 10), "longlat"))
#>           [,1]      [,2]      [,3]
#> [1,] 0.9254166 0.3368241 0.1736482
fm_mesh_2d_map(loc, "longlat", inverse = FALSE)
#>      [,1] [,2]
#> [1,]   20   10