Check whether the given spdf_list is a valid spdf_list and has all the required params.

The spdf_list must be a list of at most two elements. All elements must be a s4 class of type SpatialPolygonsDataFrame.

Usage,

assert_spdf_list(spdfs_list)

Arguments

spdfs_list

A list with the spdfs of all map levels

Value

TRUE if spdf_list is valid.