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John,<br>
<br>
1) Technically they describe the same coordinate system, but 3785
is deprecated and replaced by 3875 as the "official" EPSG code.
900913 was the original, "user defined" (aka non-offical) code so
has been in use longer (and some systems may not have adopted the
official code yet). So go with 3875 if possible, but you could use
900913 if necessary.<br>
<br>
2) You should demand(!) that the WMS servers serve up the data in
your display coordinate system (it off-loads the re-projection to
the servers)., but if they don't advertise that they support it, you
could get GeoMOOSE to warp it on the fly by including a
projection='EPSG:4326' option in the <map-source> tag. Be
warned that is only does a warp and the layers will not line up as
you zoom out. The solution is to set up mapserver to act as a WMS
client, do the reprojection and serve the result in your coordinates
system of choice (e.g. 3875).<br>
<br>
3). Correct. And add a PROJECTION block to the LAYER so mapserver
knows which coordinate system they are in.<br>
<br>
<pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
<br>
On 4/15/2011 1:25 PM, John Callahan wrote:
<blockquote
cite="mid:BANLkTikNLOryV51_CavE4e5RrKxKEuwSAA@mail.gmail.com"
type="cite">I'm creating a GeoMoose application that will use the
various Google tile layers as backgrounds. (I originally created
a basic app in my local state plane projection but then realized
that the Google-like backgrounds are critical.) I've downloaded
the Web Mercator demo and am looking at <a moz-do-not-send="true"
href="http://geomoose.org/howto/commercial_layers.html">http://geomoose.org/howto/commercial_layers.html</a>
for guidance. As I go through this, a few quick questions:<br>
<br>
1) Should I use EPSG:3857, EPSG:3785 or EPSG:900913? Or does it
matter as long as Proj4 supports it and there's a corresponding
file in proj4js\lib\defs <br>
<br>
2) In the mapbook file, should all the data sources (nearly all of
WMS type) have the same projection attribute, such as
projection="EPSG:3857"? <br>
<br>
3) Just to confirm, my raw data files do not need to be in the
"web mercator" projection, only the MAP Projection and Extent
parameters in the map files, correct?<br>
<br>
<br>
- John<br>
<br clear="all">
***********************************<br>
John Callahan, Research Scientist<br>
Delaware Geological Survey<br>
University of Delaware<br>
URL: <a moz-do-not-send="true" href="http://www.dgs.udel.edu"
target="_blank">http://www.dgs.udel.edu</a><br>
*******************************<br>
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