I'm not sure if my previous posting reached everyone. Of course, users need
to be aware that all archaeological polygons except designated areas are
(like all other SMR information) fuzzy and open to change as knowledge and
ideas develop. We can't draw fuzzy lines on maps but we can indicate how
seriously we think they should be taken. As I suggested in my earlier
posting, we are already implementing a system to indicate the accuracy of
plotted grid refs on the GIS by including a field in the theme table. This
will allow us to use different symbols or colours to draw attention to this
aspect. The question of fuzzy edges and uncertainty can be dealt with
similarly by a field that gives an indication by means of a numerical or
alphabetical score as to our assessment of polygon accuracy. I suggested a
scale of 1-10 but a variety of schemes might be used and this I think would
be a good candidate for a nationally agreed system.
As to symbols, I think there would be useful mileage in adopting the OS
symbols and getting them included as a standard symbol set. However, how the
polygons are shown on the map, and the colours in which the symbols appear,
should not be standardised. As has been said, we need to tailor our
information to display to best advantage on a wide variety of maps.
John
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John Wood
Senior Archaeologist
Planning and Development Service
The Highland Council
Glenurquhart Road
Inverness IV3 5NX
Tel: 01463 702502 Fax: 01463 702298
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Web: <http://www.higharch.demon.co.uk>
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