In this way, the users of this model could not only use the
data editing function of GIS to manage the spatial data of the
function zone and pollution sources, but also use other
application program to analyze and manage the attribute data in
SQL database directly. All the result could be reflected finally
in the graphical platform of GIS, which realized the incorporate
management between the spatial data and the traditional twodimension
data.
2) Measuring the position of the function zone and the
nodal point