[mapserver-users] MapServer Projections and Extents Tutorial

[Seth G]

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 <geographika at gmail.com 
> <mailto:geographika at gmail.com>> 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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