define_shapefiles: Define a shapefile to use in plotting from the limits...
In ggOceanMaps: Plot Data on Oceanographic Maps using 'ggplot2'

define_shapefiles

R Documentation

Define a shapefile to use in plotting from the limits argument

An internal function to make basemap code more readable

define_shapefiles(limits, force_dd = FALSE)

`limits`	A numeric vector of length 4: The first element defines the minimum longitude, the second element the maximum longitude, the third element the minimum latitude and the fourth element the maximum latitude of the bounding box.
`force_dd`	Logical indicating whether the shapefile should be forced to DecimalDegree. Required for transforming dd_* shapefile objects to other projections.

This is an internal function, which is automatically run by the basemap function.

A list containing the correct shapefile, a logical statement whether the limits were supplied as decimal degrees and coordinate reference system.

Mikko Vihtakari