[Geoserver-users] Tell me about tiled=yes and tiled=true

GeoServer GeoServer User
1

Hi,

I was reading this two years old discussion
https://www.mail-archive.com/geoserver-users@lists.sourceforge.net/msg08781.html

There seems to be a GeoServer WMS vendor parameter "tiled=yes" and then there is a GeoWebCache WMS vendor parameter "tiled=true"
http://docs.geoserver.org/stable/en/user/services/wms/vendor.html#tiled

Can anybody tell clearly what is the difference? What happens with combinations "GS + tiled=true" and "GWC + tiled=yes"? And what is the role of "tilesorigin" in this play?

-Jukka Rahkonen-

2

On Thu, Apr 3, 2014 at 11:46 AM, Rahkonen Jukka (Tike) <
jukka.rahkonen@anonymised.com> wrote:

Hi,

I was reading this two years old discussion

https://www.mail-archive.com/geoserver-users@lists.sourceforge.net/msg08781.html

There seems to be a GeoServer WMS vendor parameter "tiled=yes" and then
there is a GeoWebCache WMS vendor parameter "tiled=true"
http://docs.geoserver.org/stable/en/user/services/wms/vendor.html#tiled

Can anybody tell clearly what is the difference? What happens with
combinations "GS + tiled=true" and "GWC + tiled=yes"? And what is the role
of "tilesorigin" in this play?

As far as I know the parameters have an effect only on GeoServer, if you're
hitting GWC own WMS the requests will be tiled anyways.

For GeoServer tiled=true tells GeoServer to build a 3x3 metatile in memory,
and cache the 9 resulting tiles
in memory for a short time, under the assumptions the nearby tiles will be
fetched very soon.
Since GeoServer does not have a reference tile grid to use, the tilesorigin
parameter was used to give it
and origin point for the tile grid.

When using the GWC direct integration, that tries to server map requests
aligning to the GWC cached grid directly,
without having GS paint the request, the integration will also trigger only
if tiled=true is present in the request

Cheers
Andrea

--

Meet us at GEO Business 2014! in London! Visit http://goo.gl/fES3aK
for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

-------------------------------------------------------

3

TLDR: tiled=true gives permission for GeoServer to return an error if GetMap request does not line up with defined tile set.

From http://wiki.osgeo.org/wiki/WMS_Tiling_Client_Recommendation

“If a request is made with tiled=true, a tiling WMS server may respond with HTTP 404 or 500 to indicate that a request fails to meet the recommendations given here.”

···

Jody Garnett

On Thu, Apr 3, 2014 at 8:46 PM, Rahkonen Jukka (Tike) <jukka.rahkonen@anonymised.com> wrote:

Hi,

I was reading this two years old discussion
https://www.mail-archive.com/geoserver-users@lists.sourceforge.net/msg08781.html

There seems to be a GeoServer WMS vendor parameter “tiled=yes” and then there is a GeoWebCache WMS vendor parameter “tiled=true”
http://docs.geoserver.org/stable/en/user/services/wms/vendor.html#tiled

Can anybody tell clearly what is the difference? What happens with combinations “GS + tiled=true” and “GWC + tiled=yes”? And what is the role of “tilesorigin” in this play?

-Jukka Rahkonen-

Geoserver-users mailing list
Geoserver-users@anonymised.comsts.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users

4

On Tue, Apr 8, 2014 at 4:02 PM, Jody Garnett <jody.garnett@anonymised.com> wrote:

TLDR: tiled=true gives permission for GeoServer to return an error if
GetMap request does not line up with defined tile set.

From http://wiki.osgeo.org/wiki/WMS_Tiling_Client_Recommendation

"If a request is made with tiled=true, a tiling WMS server may respond
with HTTP 404 or 500 to indicate that a request fails to meet the
recommendations given here."

GeoServer will not do that, if tiles origin is not provided it will simply
assume it cannot do metatling, and treat it as a simple request.
In fact tiled/tilesorigin are meant for clients that are just using simple
WMS, but insist on making tiled requests, as opposed
to clients that are WMS-C aware (use GWC directly for those)

Cheers
Andrea

--

Meet us at GEO Business 2014! in London! Visit http://goo.gl/fES3aK
for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

-------------------------------------------------------