[mapserver-users] Beginner question - UK projections

[dchampion at clacks.gov.uk]

I'm a new Mapserver user, and not a geographer, so this may be a simple 
question! Any help would be most gratefully received.

I've compiled v3.5 with PROJ4 support and the demo works beautifully.

I have a shapefile with data of my local area, Clackmannanshire in 
Scotland. My problem is how to get this data to display. I'm fairly sure 
it has something to do with projections, but that's where my understanding 
runs dry.

So, how do I determine:

a) What extent values to use
b) What values to put in the PROJECTION block in the .map file?

I've taken EXTENT values from ArcView based on UK OS grid references, and 
I've tried this for projection, based on my scant understanding, but no 
data is displayed:

PROJECTION
  "proj=tmerc"
  "ellps=airy"
  "zone=31"
  "north"
  "no_defs"
END

TIA

Daniel Champion
Web Development Manager
ClacksWeb
http://www.clacksweb.org.uk


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