A system of R scripts and functions for executing and evaluating SPARROW surface water-quality models that generates graphical, map, and tabular output.
The ‘OS_type’ field specifies the OS(es) for which the package is intended. If present, it should be one of unix or windows, and indicates that the package can only be installed on a platform with ‘.Platform$OS.type’ having that value.
Per section 1.1.1 of CRAN's Writing R Extensions: