[webmap-discuss] RE: [Context.RWG] Using OWS Context to describe GML/WFS layers whichdecimate

[Cameron Shorter]

Tom,
Yes using groups would work.

Do you expect to have a proposed schema with the group tag included in 
time for me to use it in the OWS4?

Kralidis,Tom [Burlington] wrote:
>  
> 
> 
>>-----Original Message-----
>>From: Cameron Shorter [mailto:cameron.shorter at gmail.com] 
>>Sent: 31 October, 2006 7:17 PM
>>To: Kralidis,Tom [Burlington]
>>Cc: Martin Daly; context.rwg at opengeospatial.org; 
>>webmap-discuss at mail.osgeo.org; Raj Singh
>>Subject: Re: [Context.RWG] Using OWS Context to describe 
>>GML/WFS layers whichdecimate
>>
>>Kralidis,Tom [Burlington] wrote:
>>
>>>Cameron,
>>>
>>>So you want one OWSContext FeatureType to hold many GML documents?
>>>
>>>If yes, can you not define each GML doc as an OWSContext 
>>
>>FeatureType, 
>>
>>>each with respective scale rules?
>>
>>Tom,
>>Using Style scale rules to make a layer visible or not would 
>>be one solution - but with a number of limitations:
>>1. If I were to build a LayerList (or Legend) from the 
>>Context, would I end up with a layer for each scale?
>>
> 
> 
> Yes, however you could build your client Legend handler to show layers
> only if they're within the scale range of where the application scale is
> at.
> 
> 
>>2. If my legend was smart, and layers were only visible at 
>>certain resolutions, how do I associate a HighResolutionLayer 
>>with a LowResolutionLayer so that the Layer attributes (like 
>>visibility) can be associated between layers.
>>
> 
> 
> If OWSContext identified the notion of a @group attribute as part of the
> AbstractResourceType, this might be an option.  There has been some mild
> discussion on this front.
> 
> 
> 
>>> 
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: Cameron Shorter [mailto:cameron.shorter at gmail.com]
>>>>Sent: 30 October, 2006 7:29 PM
>>>>To: Martin Daly
>>>>Cc: context.rwg at opengeospatial.org; Kralidis,Tom [Burlington]; 
>>>>webmap-discuss at mail.osgeo.org; Raj Singh
>>>>Subject: Re: [Context.RWG] Using OWS Context to describe GML/WFS 
>>>>layers whichdecimate
>>>>
>>>>Martin,
>>>>Point taken regarding G/Y/M maps. Replace zoomLevel with 
>>>>sld:Min/MaxScaleDenominator in my previous comment.
>>>>
>>>>I still need to reference different GML sources for each layer 
>>>>depending on scale, which doesn't seem to be covered by OWS Context 
>>>>yet.
>>>>
>>>>
>>>>Martin Daly wrote:
>>>>
>>>>
>>>>>>zoomLevel is a term used by Google/Yahoo/MSN Maps.
>>>>>>It is a measure of resolution. As you zoom out, the zoomLevel 
>>>>>>increases.
>>>>>
>>>>>
>>>>>That is not a definition that will wash in a standard that 
>>
>>aims for 
>>
>>>>>interoperability.
>>>>>
>>>>>In fact, OWS Context already uses 
>>
>>sld:Min/MaxScaleDenominator in the 
>>
>>>>>AbstractResourceType, so the capability already exists.
>>>>>
>>>>>As with the previous long e-mail trail re. GYM data, this
>>>>
>>>>spec. should
>>>>
>>>>
>>>>>leverage de jure OGC standards, not de facto ones that
>>>>
>>>>large parts of
>>>>
>>>>
>>>>>the target audience cannot use.
>>>>>
>>>>>M
>>>>>
>>>>>
>>>>
>>>>
>>>>--
>>>>Cameron Shorter
>>>>http://cameron.shorter.net
>>>>
>>>
>>>
>>
>>--
>>Cameron Shorter
>>http://cameron.shorter.net
>>
> 
> 
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-- 
Cameron Shorter
http://cameron.shorter.net