[Geomoose-users] air photo not showing up print when using wms & reprojecting

Brian Fischer bfischer at houstoneng.com
Tue Apr 20 12:08:11 EDT 2010 

Brent you are exactly right.  Using the projection='EPSG:4326' option to a WMS source just does a warp on the image.  This is code that was written by the OpenLayers project.  I would caution people that use this option that the Warp is not very accurate at all.  It just tries to rotate and scale the image as best in can based on the four corners of the image.

If you want something that re-projects the WMS data layer you should use a mapfile and MapServer type for that.

Brian Fischer, CFM  GIS Project Manager
Houston Engineering, Inc.
Phone: Direct: 763-493-6664 / W: 763.493.4522 / M: 763.229.2734


-----Original Message-----
From: Brent Fraser [mailto:bfraser at geoanalytic.com] 
Sent: Tuesday, April 20, 2010 10:55 AM
To: Mark Volz
Cc: geomoose-users at lists.sourceforge.net
Subject: Re: [Geomoose-users] air photo not showing up print when using wms & reprojecting

   The print_util.php code appears to be limited to requesting WMS images in the 
same projection as the output view/map.

   While it looks like you can specify the SRS as a "params" setting in the Map 
Source (so the WMS server knows which coordinate system you want), the PHP does 
not transform the BBOX coordinates from the view/map projection into the SRS of 
the WMS request.  And even if it did, it does not project (or even warp) the 
returned image to target coordinate system.

   As a side note, I think adding a projection='EPSG:4326' option to the Map 
source tag allows Geomoose to do a warp (as an approximate re-projection).  I 
suppose it could have looked for a <param name="SRS" value="EPSG:4326"/>, but 
there could be a case where the two need to be different.

So the work-around for now is to use mapserver on your server as a WMS client to 
do the re-projection.  Unless I missed something...

Best Regards,
Brent Fraser

Mark Volz wrote:
> Len,
> 
> It appears that GeoMoose is sending the request for printing in County
> Coordinates, which the lmic server doesn't handle.  I wonder if there is a
> way to use the wms directly for viewing the map, but then turn on an
> alternate layer for printing?  My other thoughts are that maybe I could use
> UTM-15, then modify the displayCoordinates in main.js to display the county
> coordinates...
> 
> 
> 
> When Viewing the map:
> 
> http://geoint.lmic.state.mn.us/cgi-bin/wms?LAYER=&SERVICE=WMS&VERSION=1.1.1&R
> EQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=imag
> e%2Fjpeg&LAYERS=fsa2009&SRS=EPSG%3A4326&BBOX=-95.93229014080966,44.4136078637
> 4146,-95.82239333904468,44.45166020637491&WIDTH=2037&HEIGHT=984
> 
> 
> When printing the map:
> 
> http://geoint.lmic.state.mn.us/cgi-bin/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=
> GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG:127083&FORMAT=ima
> ge/jpeg&WIDTH=800&HEIGHT=700&BBOX=494127.36728056,178566.75342801,513259.4773
> 4712,190556.02122377&LAYERS=fsa2009
> 
> 
> Thanks for your help
> 
> 
> Mark Volz
> GIS Specialist
> Lyon County, MN
> 
> -----Original Message-----
> From: Len Kne [mailto:lkne at houstoneng.com] 
> Sent: Monday, April 19, 2010 4:49 PM
> To: 'bfraser at geoanalytic.com'; Mark Volz
> Cc: geomoose-users at lists.sourceforge.net
> Subject: RE: [Geomoose-users] air photo not showing up print when using wms &
> reprojecting
> 
> Check the URL in the map-source, it cannot have any params on it as the
> print_util script adds a "?" to the end of the string if it is not there.
> Thus if you have something like:
> 
> http://geoint.lmic.state.mn.us/cgi-bin/wms?format=image/jpeg
> 
> the script will do this:
> 
> http://geoint.lmic.state.mn.us/cgi-bin/wms?format=image/jpeg?
> 
> Move the params to tags in the map-source.
> 
> For diagnostics, you can uncomment lines 173 and 174 in php/print_util.php to
> get the URL string, feed that into a browser to see if the server returns any
> info.
> 
> Len
> 
> -----Original Message-----
> From: Brent Fraser [mailto:bfraser at geoanalytic.com] 
> Sent: Monday, April 19, 2010 2:17 PM
> To: Mark Volz
> Cc: geomoose-users at lists.sourceforge.net
> Subject: Re: [Geomoose-users] air photo not showing up print when using wms &
> reprojecting
> 
> Mark,
> 
>   I don't have that particular case, but I notice that there is projection
> support in GM v2.2 print_util.php so it is supposed(?) to work.
> 
>   Since you've got the layer displaying interactively, you have something
> like projection='EPSG:4326' in the map source tag.  Perhaps there's a
> limitation by the WMS server on the number of pixels you can request? 
> Did you try requesting a print with "Image Quality" = standard (this
> will request less pixels)?
> 
> Brent
> 
> 
> 
>> Hi,
>>
>> I noticed that my air photo does not appear to show up my map when I use
>> the
>> "print" tool.  I am reprojecting the air photo.  I am assuming this is
>> either
>> a bug or a limitation.  Has anyone had success with having the air photo
>> show
>> up on the map when using the print tool when the map-source type is  wms
>> and
>> it is being reprojected?
>>
>>
>>
>>
>>
>> Mark Volz
>> GIS Specialist
>> Lyon County, MN
>> 507-532-8218
>>
>>
>>
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