In addition to the housing sale price and characteristics,
each sale property was geo-coded allowing a GIS data set to
be compiled. Census Block Group median income data were
included as a spatial layer.4 The GIS software ArcView was
used to calculate each property's proximity to Gate One of
the Patuxent Naval Air Station and to the county landfill
located within the watershed. The location of property sales
within the watershed, along with the location of the county
landfill and Gate One of the Naval Air Station are illustrated
on Fig. 2.