limiting layer visibility by extent

[Benjamin Wragg]

Summing up what I've found, the feature request at
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=786 isn't actually about
at what I was after. After re reading it (and a quite chat with Howard
Butler) I can see that this feature request is just about querying the
extent of a layer not limiting what is shown (don't I feel stupid :) ).  

So since mapserver doesn’t really support limiting a layer with "show this
layer only when my view is completely within it", I've build some code in
php which checks the extent of the current view (using mapscript) and then I
do a "within" query over the extents of some tiles. If it returns a tile id,
I turn that tile on.

Cheers,

Benjamin

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at lists.umn.edu] On
Behalf Of Benjamin Wragg
Sent: Wednesday, 8 November 2006 9:02 AM
To: MAPSERVER-USERS at lists.umn.edu
Subject: Re: [UMN_MAPSERVER-USERS] limiting layer visibility by extent

Thanks for the response, not quite what I mean't though. I need the layer to
turn only when your view extent is completely within the extent of the
layer. Its what a client whats for some raster tiles. E.g if your completely
within a tile turn it on but if your half over the extent of one tile and
half over the extent of another, turn them both off.

I know it sounds a little silly to do this (why not just display both
tiles!) but this what the client watns and I'm just trying to figure out if
its possible. :)

Cheers,

Benjamin

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Steve Lime
Sent: Wednesday, 8 November 2006 2:29 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] limiting layer visibility by extent

If I understand you correctly MapServer does this automatically if you set
STATUS DEFAULT. The layer is always on and is shown if it's extent overlaps
the view extent.

Steve

>>> Benjamin Wragg <bwragg at TPG.COM.AU> 11/07/06 6:15 AM >>>
Hi All,
 
I was wondering if anyone knows if it's possible to limit a layers
visibility by the current extent? E.g if the current extent is within the
layers extent, turn the layer on

I looked around and all I could find was this feature request
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=786 . It seems like Howard
Butler may have got something going but I can't see mention of it in the
mapfile reference on the site?

Cheers,

Benjamin

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