The water quality data were acquired from twenty-two (8
tidal and 14 non-tidal) water-monitoring stations located
throughout the watershed. The water quality monitoring
activities are part of the St. Mary's River Project conducted
by the Biology Department at St. Mary's College of Maryland.
The hedonic property value model uses annual
averages for dissolved inorganic nitrogen (DIN) and total
suspended solids (TSS) measured at each of the monitoring
stations. Using Arc View, each property was assigned to the
closest monitoring station (using a straight-line distance),
and linked by the sale year to the corresponding yearly
average of the closest monitor's water quality data. This
procedure for assigning the water quality measures to each
sale property from the closest monitoring station is
consistent with hedonic property valuation studies within
air-sheds