This is kind of hard to explain but what I want to do is use Mapserver
to project my data which is in the GDA94 projection as shown below:<br><br><span style="background-color: rgb(255, 255, 102);">"# GDA94 / MGA zone 55
</span><br style="background-color: rgb(255, 255, 102);"><span style="background-color: rgb(255, 255, 102);"><28355> +proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <>"</span>
<br><br>to a projection that will be able to be properly merged with
Google maps (using OpenLayers) which uses a projection something like
the following:<br><br><span style="background-color: rgb(255, 255, 102);">"Update
4: Agreement frrom Melita Kennedy and David Burrows that Google Maps
and Virtual Earth use spherical equations for the Mercator projection.
The correct proj4 settings are:
</span><br style="background-color: rgb(255, 255, 102);"><br style="background-color: rgb(255, 255, 102);"><span style="background-color: rgb(255, 255, 102);">+proj=merc +latts=0 +lon0=0 +k=1.0 +x0=0 +y0=0</span><br style="background-color: rgb(255, 255, 102);">
<span style="background-color: rgb(255, 255, 102);">+a=6378137.0 +b=6378137.0 +units=m</span><br style="background-color: rgb(255, 255, 102);"><br style="background-color: rgb(255, 255, 102);"><span style="background-color: rgb(255, 255, 102);">
Note this is different than using the ellipsoidal equations which would be:</span><br style="background-color: rgb(255, 255, 102);"><br style="background-color: rgb(255, 255, 102);"><span style="background-color: rgb(255, 255, 102);">
+proj=merc +latts=0 +lon0=0 +k=1.0 +x0=0 +y0=0</span><br style="background-color: rgb(255, 255, 102);"><span style="background-color: rgb(255, 255, 102);">+ellps=WGS84 +datum=WGS84 +units=m no_defs"<br><br><span style="background-color: rgb(255, 255, 255);">
I
believe that I need to use Mapserver to do this but I have no idea how
to go about it. Currently my Mapserver is running fine displaying the
data correctly using the GDA94 projection except i had to use a .vrt
file to correctly align the raster image which was slightly out of
alignment. I have also set up and can call my Mapserver as a WMS
(thought having issues with the WMS Layer function in OpenLayers, just
displays a white screen but I believe that this is to do with
projections)
<br><br>My Mapserver has been compiled with GD, GDAL, GEOS, PostGIS, PHP and proj4.<br><br>In my mapfile I have defined each layer using "init=epsg:28355" as well as globally defining the map using the same projection.
<br><br>This reason I am trying to do this is because currently I don't
think that my projection can be properly imported into OpenLayers and
merged with Google Maps.<br><br>Thanks<br><br>Brad</span></span>