assert_spdf_list: Check whether the given spdf_list is a valid spdf_list and has all the required params.
Description
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)
Value
TRUE if spdf_list is valid.
Arguments
- spdfs_list
A list with the spdfs of all map levels