Thanks Tanya.
I'm going to run a few tests with a database connection to see what
queries are generated to calculate the layer extents for WMS/WFS, and
then may make a suggestion to update the MapServer docs.
Seth
On 02/11/2016 22:12, TC Haddad wrote:
Hi Seth,
I do agree that it should be *highly* recommended to set the extents
of each LAYER, as people are often unaware what a huge speed advantage
it is to have this already set. I found it to be particularly true for
WFS.
I believe you should set the layer extents in the native coordinates
of the layer, and let Mapserver take it from there.
Tanya
On Wed, Nov 2, 2016 at 11:38 AM, Seth G <[email protected]
<mailto:[email protected]>> wrote:
Hi all,
A draft tutorial has been completed on use of projections in
MapServer:
https://geographika.github.io/tutorial/quickstart/projections.html
<https://geographika.github.io/tutorial/quickstart/projections.html>
Comments and feedback welcome. This relates to
http://mapserver.org/development/rfc/ms-rfc-115.html
<http://mapserver.org/development/rfc/ms-rfc-115.html>
There are a couple of things I came across that are still unclear
to me relating to extents.
* Setting the EXTENT for a map has no effect when accessing via
WMS, apart from the BoundingBox of the GetCapabilities
metadata. Data is not restricted/limited.Not setting this
leaves the MAP level BoundingBox extent as -1,-1,-1,-1. Should
the MAP EXTENT have any other effects?
* The help for LAYER EXTENT states "In most cases you will not
need to specify this, but it can be used to avoid the speed
cost of having MapServer compute the extents of the data" -
however all BoundingBox extents for each layer are
automatically calculated from the source data in the WMS
GetCapabilities request. I presume this could become quite
slow with more and more layers. Is it/should it be recommended
to manually set these (either with wms_extent in the LAYER
METADATA or using LAYER EXTENT)?
Thanks for any clarifications on the above.
Regards,
Seth
--
web:http://geographika.co.uk
twitter: @geographika
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