This software was originally developed and maintained through Version 1.3 by Systems Planning and Analysis, Inc. (SPA), of Alexandria, Virginia.
Except where noted, the information contained in example and
sample data files (found in
is derived from publicly available digital data sets. These data files
are provided as a convenience to Mapping Toolbox™ users. MathWorks
makes no claims that any of this data is free of defects or errors,
or that the representations of geographic features or names are up
to date or authoritative.