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Text File
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1996-12-05
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2KB
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61 lines
MAP INFORMATION FOR CALLER DISPLAY
Paul Skirrow, Octopus Systems, November 1996
Caller Display can display a map of the UK showing the location of
the caller or of a town or city.
This map was generated with David Pilling's excellent Panorama program
which in turn uses data from the CIA World fact book.
The UKmap sprite in the Sprites file covers the area from -11,+49° to
+2,+59°, using simple projection (ie linear translation from co-ordinates
to pixels).
Extra features may be added to the map to indicate town, cities or
area offices, providing the map covers the same area and uses the
same number of pixels in each axis.
At present the map uses a 4 colour sprite (to minimise memory
requirements), but this can be changed without requiring any modification
to the software.
The co-ordinate data in the Area Codes file provides the approximate
position of the major town and cities. The accuracy is quite adequate
for the purpose of this software, but note that some area codes
cover quite a large area and can also cover several small towns.
The co-ordinates in the AreaCodes file are integers representing the
latitude and longtitude in minutes. For example, Ipswich is 52°0' North
and 1°8' East and this is represented in the AreaCodes file as 3120,68
(ie 52×60=3120, 1×60+8=68).
CREDITS
-------
The AreaCodes file was compiled from various sources and compiled
automatically.
Much of the data is derived from the Oftel Specified Numbering Scheme -
Code List, issued by Oftel's Numbering Administration Unit. That 'Code
List' is supplied with the following notice:
The Code List, as supplied in printed
and/or computer readable form is © Crown
Copyright but may be reproduced with due
acknowledgement of the source of the
information. No responsibility is accepted
for any errors which may be introduced as
a result of any such reproduction.
We would also like to thank T.Clark for his 'UK Telephone National Number
Group Codes' which has been used for its co-ordinate information.
Paul Skirrow, Octopus Systems, 9 Randwell Close, IPSWICH IP4 5ES, England
Tel:01473 728943 Email: pskirrow@octosys.co.uk http://www.octosys.co.uk/