[mapserver-users] mapcache: restricted extent and ruleset to limit cache area seems ineffective

[TC Haddad]

I’ve had success setting a mask at the Mapserver level, and MapCache has
not problem only rendering imagery to the edge of whatever irregular shape
you need to use (e.g. watershed or county boundary). So maybe try that?

However It’s true, MapCache will still return blank tiles outside the mask
area.

Tanya

On Fri, Sep 6, 2019 at 1:36 PM Mark Volz <MarkVolz at co.lyon.mn.us> wrote:

> Hello,
>
>
>
> I am still having issues restricting the extent in my mapcache area using
> rulesets.  I created a rule for all of my zoom levels that has a limited
> visibility extent.  However, Mapcache is still returning imagery for the
> entire grid area even though I created a rule that should only display a
> limited extent.  I am still not sure why the visibility extent rule seems
> ineffective.
>
>
>
> Thanks!
>
>
> ------------------------------
>
> You can set the
>
> <errors>empty_img</errors>
>
> To return a blank tile.  I believe the status is still 404 - I don't think you can control this
>
>
>
> On Fri, 30 Aug 2019 at 15:44, Mark Volz <MarkVolz at co.lyon.mn.us> wrote:
>
> Hello,
>
>  I am in the process of limiting the cached area in mapcache.  I am having
> trouble with both the restricted_extent and ruleset parameters.  I first
> started by using restricted_extent such as “<grid restricted_extent="435567
> 98889 568247 259687">LyonCC</grid>”.  That parameter seemed to work.
> However mapcache returned 404 errors for any tiles outside of the
> restricted extent.  Next I tried to use rulesets instead.  The rulesets
> seem to have no effect, and new tiles were getting generated outside of the
> visibility extent.
>
>  Question 1:  When we use restricted extents on a grid should MapCache
> return a transparent tile, white tile, or a 404 error?  Can we control what
> it returns?
>
>  Question 2:  Do I have my ruleset configured appropriately?
>
>  <tileset name="LyonBaseMap">
>
> <grid ruleset="CountyBuffer">LyonCC</grid>
>
> </tileset>
>
>  <ruleset name="CountyBuffer">
>
> <rule zoom_level="1 2 3 4 5 6 7 8 9 10 11"><!—Do I need to include zoom
> levels?-->
>
> <visibility>
>
> <extent>435567 98889 568247 259687</extent>
>
> </visibility>
>
> </rule>
>
> </ruleset>
>
>  Thank You!
>
>
>
> Sincerely,
>
> *Mark Volz, GISP*
>
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