[UMN_MAPSERVER-USERS] Latlong in, tmerc OSGB36 out?

[Dave Pearson]

Hello list,

I have a problem I just can't see the answer to, hope someone can help!
I have made a php mapscript service which accepts lat/long WGS84 GPS 
co-ordinates, but I wish to display the extents given in lat/long in the 
british ordnance survey transverse mercator projection, OSGB36. I have a 
mixture of shapefiles in both latlong (WGS84) and OSGB36.

I can get the service working accepting latlong and rendering latlong, but 
at the latitude of the UK everything looks really "squished" vertically.

How can I pursuade mapserver to project in OSGB36 yet still accept all input 
co-ords in latlong?  I think the clue may be in the "+to" of proj4 - or am I 
wrong in thinking mapserver can handle such a thing?

Here is my mapfile as it stands - unfortunately it's latlong, and doesnt 
honor the to - I think? Can anybody help please?

OUTPUTFORMAT
       NAME png
       DRIVER "GD/PNG"
       IMAGEMODE pc256
END

WEB
       IMAGEPATH "/var/gis/webgis/maps/"
       IMAGEURL "http://localdomain/webgis/maps/";
END
MAP
       STATUS ON
       SIZE 500 380
       EXTENT  -11.0 44.0 9.0 59.0
       UNITS dd
       SHAPEPATH "/var/gis/live"
       IMAGECOLOR 247 245 222
       FONTSET "/var/gis/live/fonts/fonts.txt"
       PROJECTION
               "proj=latlong"
               "ellps=WGS84"
               "datum=WGS84"
               "nodefs"
# this bit doesnt seem to get recognised
               "to"
               "proj=tmerc"
               "lat_0=49.000000000"
               "lon_0=-2.000000000"
               "k=0.9996012717"
               "x_0=400000.000"
               "y_0=-100000.000"
               "ellps=airy"
               "datum=OSGB36"
               "no_defs"
       END

LAYER
       CONNECTIONTYPE postgis
       NAME custpoi_pointl
       PROJECTION
               "proj=latlong"
               "ellps=WGS84"
               "datum=WGS84"
       END
       DATA "the_geom from custpoi_point"
       CONNECTION "user=postgres password=***** dbname=**** host=127.0.0.1"
       STATUS DEFAULT
       TYPE ANNOTATION
       CLASS
               TEXT " "
               STYLE
                       SYMBOL "poi1"
                       COLOR 238 0 0
                       SIZE 10
                       ANTIALIAS TRUE
               END
               LABEL
                       TYPE truetype
                       FONT arialb
                       SIZE 0
                       COLOR 238 0 0
                       FORCE FALSE
                       POSITION AUTO
               END

       END
END
LAYER
       NAME andesl7
       PROJECTION
               "proj=tmerc"
               "lat_0=49.000000000"
               "lon_0=-2.000000000"
               "k=0.9996012717"
               "x_0=400000.000"
               "y_0=-100000.000"
               "ellps=airy"
               "datum=OSGB36"
               "no_defs"
       END
       STATUS OFF
       MINSCALE 3000000
       TILEINDEX "al7.shp"
       TILEITEM "location"
       TYPE RASTER
END
END

Regards

Dave Pearson

_________________________________________________________________
Windows Live™ Messenger has arrived. Click here to download it for free! 
http://imagine-msn.com/messenger/launch80/?locale=en-gb