The MiddleFork04.ssn data folder contains the spatial, attribute,
and topological information needed to construct a spatial stream
network object using the SSN2 package. mf04p was created
using ssn_import().
mf04pAn object of class SSN of length 4.
MiddleFork04.ssn for details about the contents of mf04p.
ssn_import() to convert a .ssn object to an SSN object in R.
ssn_create_distmat for details about the distance matrix file structure.