Transform spatial coordinates to another projection — transform

The function transforms spatial coordinates from original projection (decimal degrees assumed) to another projection.

transform_coord(
  x = NULL,
  lon = NULL,
  lat = NULL,
  new.names = c("lon.utm", "lat.utm"),
  proj.og = "+proj=longlat +datum=WGS84",
  proj.out = "+init=epsg:32633",
  map.type = NULL,
  verbose = FALSE,
  bind = FALSE,
  na = "ignore"
)

Arguments

x	data frame to be transformed. Can be omitted if numeric vectors are assigned to `lon` and `lat`.
lon, lat	either a name of the longitude and latitude columns in `x` or a numeric vector containing longitude and latitude coordinates. Use `NULL` to guess the longitude and/or latitude columns in `x`.
new.names	a vector of length 2 specifying the names of transformed longitude and latitude columns, respectively. `NULL` returns column names from `x`
proj.og	original `proj4string` projection. If `NULL`, the projection is taken from `x`. `x` must be a Spatial object in that case.
proj.out	the `proj4string` projection the coordinates should be transformed to. Defaults to the "svalbard" shape file projection.
map.type	a character string specifying the map type for which coordinates should be transformed to. If `NULL` (default), `proj.out` is used to determine the returned projection. See `type` argument for possible map types. Overrides `proj.out`.
verbose	if `TRUE`, the function prints information about the changed projection. Switch to `FALSE` to make the function silent.
bind	logical. Should only transformed coordinates be returned (`FALSE`, default) or should x be returned with transformed coordinates (`TRUE`)?
na	character specifying the NA action for missing coordinates. The "ignore" option ignores the coordinates and returns NAs to transformed coordinates. The "remove" option removes missing values from `x` returning a message while doing it. Any other character argument will tricker `na.fail` stopping the function in case of missing coordinates.

Value

Returns a data frame with transformed spatial coordinates

Details

If x is specified, the function guesses longitude and latitude columns from x by default.