Dear experts,
There seems to be some interest in this matter so here goes, thank you to
all who have considered it.
The conclusion, is there is no way of having MI graphically indicate two
coincident regions are simultaneously selected.
An inference, which I take on board, is that the table design is flawed if
it contains coincident regions.
I am thinking about alternative ways of creating the table.
The problem which resulted in my creating a table with coincident regions
is this
the country is divided into a series of numbered licences, regions in my
table.
Over time licences are reissued with either the same number or new numbers
to different operators.
Over time the boundaries of the licences change.
I have tabular data indicating which current licence numbers are fully or
partially equivalent to which previous numbers, the equivalence can be to
the same number or to different numbers, thus current number 3067 could
have been previously held as 3067 as 1334 or as 574 (with the proviso that
574 intersected current 3067 but was not exactly coincident).
In respect of each previous number I have data on operators etc.
Using the equivalence data I did SQL to link each previous identity to the
current area and then appended the results of all the SQLs to a single
table.
I wished to use my mappable table of current boundaries to determine the
history of any area graphically selectable.
I also wished to see which areas were held by any named company,
unfortunately if a named company held an area an even number of times the
selection of the area is not apparent graphically, other than this weakness
the strategy seems to work.
Any comments would be gratefully received
Brendan
brendan.o'[EMAIL PROTECTED]
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