Luisa wrote:
Before I convert to raster, how can i define all boundaries/with
Centroids with the same cat value?
do not assign categories to boundaries unless you really need them.
consider two blocks of land next to each other, separated by
a single boundary. To which block of land does the boundary belong
to? Neither. So it has no cat and a centroid in each block
contains that information (along with associated database things
like owner, etc.)
the rare exception is when the boundary which separates them is
a road, and you want that road to have its own attributes (like
pavement type, highway number, number of lanes, etc.)\
type="area" is really a bit of an alias for boundary + its
centroid.
Hamish