[mapserver-dev] layer masking rfc

[thomas bonfort]

On Thu, Dec 1, 2011 at 17:26, Lime, Steve D (DNR)
<Steve.Lime at state.mn.us> wrote:
> Sorry, I noticed that at the end of the RFC *after* I replied. I guess will have to see if that causes issues down the road. The functionality proposed will still be a welcome addition without it though.
>
> Is there any reason to denote the mask layer itself differently? For example, tileindex layers can be given a special type (e.g. TYPE TILEINDEX) so that they can be avoided during the drawing process until a layer that references them is encountered. I'd think that would be helpful from a getCapabilities perspective too. So from your RFC example you'd get:
>
> LAYER
>  NAME "parcels"
>  TYPE MASK
>  STATUS OFF
>  DATA "the_geom from parcels where clientid='%token%'"
>  CLASS
>  STYLE
>   COLOR 0 0 0
>  END
>  END
> END
>
> LAYER
>  NAME "meteo"
>  STATUS ON
>  TYPE RASTER
>  DATA "raster.tif"
>  MASK "parcels"
> END
>
> Steve
>

You need to know the type of the layer to know how to render it into
the temporary mask image. Or am I missing something ?

--
thomas

>
> -----Original Message-----
> From: thomas bonfort [mailto:thomas.bonfort at gmail.com]
> Sent: Thursday, December 01, 2011 10:18 AM
> To: Lime, Steve D (DNR)
> Cc: MapServer Dev Mailing List
> Subject: Re: [mapserver-dev] layer masking rfc
>
> Steve,
> querying will not be supported, i.e. features will not be masked out
> from a query (c.f.
> http://mapserver.org/trunk/development/rfc/ms-rfc-79.html#limitations).
> Stepping down that path means that vector intersections need to be
> computed, which is an entirely different workload.
>
> --
> thomas
>
> On Thu, Dec 1, 2011 at 17:11, Lime, Steve D (DNR)
> <Steve.Lime at state.mn.us> wrote:
>> How does this impact query operations? Seems like you'd want to restrict queries based on the mask too. -Steve
>>
>>
>> -----Original Message-----
>> From: mapserver-dev-bounces at lists.osgeo.org [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of thomas bonfort
>> Sent: Wednesday, November 30, 2011 11:33 AM
>> To: MapServer Dev Mailing List
>> Subject: [mapserver-dev] layer masking rfc
>>
>> Devs,
>>
>> I have just committed rfc 79 that proposes pixel level layer masking.
>> This is a minor enhancement so I went straight to the rfc process
>> without a mail to this list beforehand, but feel free to comment on it
>> here.
>> I would like to move rather fast on this issue, so will call for a
>> vote on this this weekend if no objections have arisen until then.
>>
>> http://trac.osgeo.org/mapserver/browser/trunk/docs/en/development/rfc/ms-rfc-79.txt
>>
>> best regards,
>>
>> thomas
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>>
>>
>
>