[Context.RWG] Using OWS Context to describe GML/WFS layers whichdecimate

[Cameron Shorter]

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?

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.


>  
> 
> 
>>-----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