Define a shapefile to use in plotting from the limits argument
Source:R/define_shapefiles.R
define_shapefiles.RdAn internal function to make basemap code more readable
Arguments
- 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.
Value
A list containing the correct shapefile, a logical statement whether the limits were supplied as decimal degrees and coordinate reference system.
Details
This is an internal function, which is automatically run by the basemap function.