needed in each coverage, the attribute data for each feature type,
and how to code and organize these attributes are determined.
Furthermore, a base map was adopted for the whole data set. Before
the spatial analysis is performed to identify potential landfill
sites, objective criteria and factors are set and evaluated for their
suitability for the study area given the related legislation, restrictions,
rules, experiences, and local expertise. A set of final values
for hazardous waste sites is demonstrated in Table 4.