[MS4W-Users] Getting blank tiles in google maps

[Brent Fraser]

If your intent is to use Google Maps as a backdrop, your target map 
projection must be Spherical Mercator.  There are a few ways to specify 
this; here's one way:

MAP
    :
   PROJECTION
       "proj=merc"
       "a=6378137"
       "b=6378137"
       "lat_ts=0.0"
       "lon_0=0.0"
       "x_0=0.0"
       "y_0=0"
       "k=1.0"
       "units=m"
       "nadgrids=@null"
       "no_defs"
   END

Next you must tell mapserver the coordinate system of each of the source 
layers.  It looks like your layers are in "British National Grid" so use:

   LAYER
     :
       PROJECTION
            "EPSG:27700"
       END
**

Best Regards,
Brent Fraser


On 9/8/2011 11:18 AM, vaibhavgarg wrote:
> Thanks for your reply. I will post in the mapserver list.
>
> Can you help me in identifying the right projection types? (extents are easy
> but not the rest)
>
> The example data is attached to the first message, which I am hoping is
> helpful. I am not so well versed in projections and it is only part I am
> having trouble with.
>
> With regards,
>
> Vaibhav G
>
>
>
> --
> View this message in context: http://osgeo-org.1803224.n2.nabble.com/Getting-blank-tiles-in-google-maps-tp6746323p6772798.html
> Sent from the ms4w-users mailing list archive at Nabble.com.
> _______________________________________________
> MS4W-Users mailing list
> MS4W-Users at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/ms4w-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/ms4w-users/attachments/20110908/0d0d13fe/attachment.htm