<html>
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 10 (filtered)">
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.EmailStyle18
{font-family:Arial;
color:navy;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Brad,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If I understand your objective correctly,
you want mapserver to re-project your layers for you to this custom
projection. For that, I think that you should set the projection for each
layer to their “source” projection, i.e., the projection that they
are currently in. For you MAP, you should set the projection to the
destination projection, i.e., the one that you want to re-project into. Mapserver
will automatically re-project it for you (I think). </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>That said, I have only used standard
projections to do this, for example, I have combined UTM with decimal degrees
in the same map with this approach. I do not know enough to say how you
go about setting the custom google projection on your MAP object.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>HTH,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Robert</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
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:#FFFF66'>"# GDA94 / MGA zone 55 </span><br>
<span style='background:#FFFF66'><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:#FFFF66'>"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>
<br>
<span style='background:#FFFF66'>+proj=merc +latts=0 +lon0=0 +k=1.0 +x0=0 +y0=0</span><br>
<span style='background:#FFFF66'>+a=6378137.0 +b=6378137.0 +units=m</span><br>
<br>
<span style='background:#FFFF66'>Note this is different than using the
ellipsoidal equations which would be:</span><br>
</span></font></p>
</div>
</body>
</html>