[mapserver-users] RE: mapcache - working with different grids

[Mark Volz]

Thomas,

*note I noticed that ArcCatalog reports the LatLongBoundingBox as 0, 0, 0,0.  This is probably important...



I realize that mapcahce does not project.  For testing I completely removed my grid, source, and tileset that is in county coordinates.  My other cache is in UTM 15, The only grid I have advertised is UTM15 such as:

      <!--<grid>WGS84</grid>-->
      <!--<grid>g</grid>-->
      <grid>UTM15</grid>

So here is what I have:

Demo: The demo site works fine.  Here is an example request that works
http://10.0.8.116/mapcache/?LAYERS=MNSOUTH11&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&FORMAT=image%2Fjpeg&SRS=EPSG%3A26915&BBOX=438394.0589,4887031.0797,471162.0589,4919799.0797&WIDTH=256&HEIGHT=256

WMS in ArcCatalog:  Doesn’t work
The lat long bounding box is 0,0,0,0.  Furthermore ArcCatalog advertises EPSG: 26915 (which is correct) , EPSG: 900913, EPSG 26915 again?, EPSG: 3857.  How can I remove the other projections.  I only want to serve 26915.
* I did try to change the coordinate system that ArcCatalog / ArcMap requests to UTM 15. Mapcahce still did not work

WMS in QGIS:  Doesn’t work.
In the properties for the service (root layer) I noticed the WGS 84 Bounding Box is empty.  However, the layer MNSOUTH11 does have a valid bounding box

WMTS in QGIS:  Works.
When adding the WMS layer in QGIS, I noticed I could switch between layers (wms) and Tilesets (WMTS?).  The tilesets work in QGIS. 

********************************************************

When I did have the County Map service configured, nothing worked.  Not even the demo.  I didn't even get any pink tiles in the demo, and firebug reported that it was not even trying to request anything.


Let me know if you have any thoughts as to why the WMS service isn’t working.

Thanks for all your help


Mark Volz
GIS Specialist
Lyon County, MN

-----Original Message-----
From: thomas bonfort [mailto:thomas.bonfort at gmail.com] 
Sent: Thursday, May 10, 2012 6:02 AM
To: Mark Volz
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] mapcache - working with different grids

Hi,


On Wed, May 9, 2012 at 9:45 PM, Mark Volz <MarkVolz at co.lyon.mn.us> wrote:
> Hello,
>
> I started working with Mapcache.  I added a tileset that is in UTM 15
> (26915) and it is working fine on the demo page 
> http://localhost/mapcache/demo/wms.  However when I add the layer to 
> ArcView, I get a warning about inconsistent extents.   I noticed the 
> service is advertising several extents:  EPSG:900913, EPSG:103749, 
> EPSG:26915, EPSG:4326, EPSG:3857.  So I made sure ArcGIS was 
> requesting the correct coordinate system via layer>change coordinate 
> system.  Even after switching the coordinate system, I still did not 
> see anything  (even when zoomed into the appropriate area)

I've never tried the wms service in arcgis...

what I do know is that mapcache advertises all known grids in the wms root layer, however only the actually cached grids are advertised for each individual layer (that's what the spec requires, although it does not fit very well with cached layers). I wouldn't be very surprised arcgis chokes on that.
Check your server logs for the requests actually being sent out by arcgis, that will at least tell you if the correct grid is being used.

>
> I also am trying to get another layer cached, which is in county 
> coordinates.  I did add a grid for the county coordinates.  
> Unfortunately I cannot get that service working in either the demo 
> page or the ArcMap.  I can get the source of that service (before it 
> is cached in MapCache) to work in ArcMap.

need more info... mapcache itself does no projection handling, the grid srs is only used as a key to lookup which tiles to return, and is forwarded to the wms server as is. Right clicking on a pink tile in the demo page and opening the image in a new window might give you more info to help debugging.

--
thomas

>
>
> Questions:
>
>
> Is this the right mailing list, or does mapcache have a separate list?
> How can I limit the grids / spatial references that Mapcache advertises?
> What am I missing that Mapcache works fine in the demo pages, but not 
> in ArcMap?  - note I set  <full_wms>assemble</full_wms> and <service type="wms"
> enabled="true">
> Is there anything I need to know about custom spatial references?  I 
> am guessing that Mapserver itself only needs the grid set.
>
>
>
> Thanks for all the help!
>
>
> Mark Volz
> GIS Specialist
>
>
>
>
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>
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