Problems in the spatial analysis arose
mostly from the poor quality of the data. The sparse distribution of the
boreholes selected for sand/gravel led to the need for a large cell size
with which to do the analysis. This in turn created a high level of generalization
of the data which made meaningful analysis difficult. However, some general
trends were discernible.
Another problem was the uneven distribution
of the data. Data in the lower right portion of the area was very highly
concentrated and distributed in two linear strips. This made the original
analysis of the point data difficult because boreholes selected for sand/gravel
were concentrated in these areas, while they were sparsely distributed
in the rest of the area. This was one of the reasons this type of analysis
using several weighting surfaces was necessary. Also, next to these linear
concentrations of points there were gaps in the data, creating areas where
dense data was adjacent to absent data. The large cell size did reduce
this affect somewhat.