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<div class="moz-cite-prefix">Thanks Tanya. <br>
<br>
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.<br>
<br>
Seth<br>
<br>
On 02/11/2016 22:12, TC Haddad wrote:<br>
</div>
<blockquote
cite="mid:CAFVrPyi=rmiQi6LzrPP+6gK5fRTBgkX779tR0HzGS4AdazoTZw@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Seth,
<div><br>
</div>
<div>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. </div>
<div><br>
</div>
<div>I believe you should set the layer extents in the native
coordinates of the layer, and let Mapserver take it from
there.</div>
<div><br>
</div>
<div>Tanya</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Nov 2, 2016 at 11:38 AM, Seth G
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:geographika@gmail.com" target="_blank">geographika@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hi all,<br>
<br>
A draft tutorial has been completed on use of projections
in MapServer: <a moz-do-not-send="true"
href="https://geographika.github.io/tutorial/quickstart/projections.html"
target="_blank">https://geographika.github.io/<wbr>tutorial/quickstart/<wbr>projections.html</a><br>
Comments and feedback welcome. This relates to <a
moz-do-not-send="true"
href="http://mapserver.org/development/rfc/ms-rfc-115.html"
target="_blank">http://mapserver.org/<wbr>development/rfc/ms-rfc-115.<wbr>html</a><br>
<br>
There are a couple of things I came across that are still
unclear to me relating to extents.<br>
<br>
<ul>
<li>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?<br>
</li>
</ul>
<ul>
<li>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)?</li>
</ul>
<p>Thanks for any clarifications on the above. <br>
</p>
<p>Regards,</p>
<p>Seth<br>
</p>
<div class="m_4627867212317795887moz-text-html"
lang="x-western"> <font color="#888888">--<br>
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href="http://geographika.co.uk" target="_blank"><font
color="#888888"> </font>http://geographika.co.uk</a><br>
<font color="#888888">twitter: @geographika<br>
</font><br>
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</blockquote>
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<br>
</div>
</blockquote>
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