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Yes it is for warping.<br>
<br>
The services tend not to be very tolerant of the data coordinate
system not being the same as the display coordinate system<br>
<pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
<br>
On 4/15/2011 3:01 PM, John Callahan wrote:
<blockquote
cite="mid:BANLkTi=OtRXc0dK7VnrBFpFQn_f56ob3EQ@mail.gmail.com"
type="cite">Thanks Brent. EPSG:3875 it is. So the map-source
projection parameter in the mapbook file is for warping the
mapserver output to fit the display coordinates. Is that
correct? I agree that the server should output maps in the srs
requested and not allow any client-side reprojection. All of my
WMS services support both my local srs and the various google
flavors.<br>
<br>
I was looking at both the the GeoMoose demos and noticed in the
web mercator demo, services such as identify and select are not
present. Will those types of services not work with web
mercator? <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>
<br>
<br>
<div class="gmail_quote">On Fri, Apr 15, 2011 at 4:48 PM, Brent
Fraser <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:bfraser@geoanalytic.com">bfraser@geoanalytic.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div text="#000000" bgcolor="#ffffff"> 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 cols="72">Best Regards,
Brent Fraser</pre>
<div>
<div class="h5"> <br>
On 4/15/2011 1:25 PM, John Callahan wrote: </div>
</div>
<blockquote type="cite">
<div>
<div class="h5">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"
target="_blank">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>
</div>
</div>
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