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OZGIS75.TUT
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1992-01-04
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OzTerr
======
Usually territories are to be developed from base zones according to some
criterion; e.g. Sales territories should all have similar sales potential;
e.g. School districts should have similar numbers of children.
The operations are as follows.
A base map is displayed: Usually this will be a standard geographic
file (e.g. Melbourne postcodes). Basic OzGIS facilities are used
to subset files if non-standard regions are required.
Specification of territories: Each territory has a unique 10
character name. Zones are assigned off the screen with the cursor.
Zones can be moved between territories and deleted. Territories can
be defined or deleted at any time.
Specification of a base-map attribute file: Territory attributes are
continually calculated by adding the values for the base zones in each
territory. The derived values are quantised (usually sequential
colour 121 class method), the territories coloured, and a legend and
histogram of sorted values displayed.
Zones can be shuffled according to the displayed territories attribute
values to meet the assignment criteria while watching the legend
and histogram.
When territory assignment is complete, the definition is output as a
combine file.
OzData provides a facility for amalgamating attribute data for a combine
file.
The combine file can be used to amalgamate the base map geographic
file zones to produce a new geographic file, where the new zones are
the territories.
The new geographic file and attribute data can be mapped
by OzGIS in the standard way.
Territory assignment can be iterated by displaying the base map as
before, but using the combine file to set the initial territory
definition. Similarly, if a basic territory assignment is know, it
can be input as a combine data file and used to start the process.