[OpenLayers-Users] [Users] baselayer

[Bart van den Eijnden (OSGIS)]

Hi Erik,

maybe the following use case:

displaying a thematic layer on top of a base layer (aerial photograph). 
To get a clearer view of the thematic map, it might help if someone can 
switch off the base layer, so the colours will come out clearer against 
a white background.

Also, it's what I am used to when using clients like Chameleon or 
Mapbuilder, but that's not the best of reasons ofcourse :-)

Best regards,
Bart

Erik Uzureau schreef:
> Dear Bart,
>
> Yes it is necessary to always have one BaseLayer in OpenLayers. All of the
> calculations are done based on the functionality that a baselayer provides.
>
> Can you explain maybe a little bit more why someone would like to have a map
> without a baselayer? Maybe there is a good solution  to this problem. :-)
>
> Thanks,
> Erik
>
> On 10/15/06, Bart van den Eijnden (OSGIS) <bartvde at gmail.com> wrote:
>   
>> Hi list,
>>
>> is it necessary to always have a BaseLayer in the OpenLayers model? I
>> haven't got anything to work without saying one of the layers is the
>> baselayer.
>>
>> Why can't I have 5 WMS layers, and give the user the possiblity to turn
>> them all on or off?
>>
>> Best regards,
>> Bart
>>
>> --
>> Bart van den Eijnden
>> OSGIS, Open Source GIS
>> bartvde at osgis.nl
>> http://www.osgis.nl
>>
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>>     
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-- 
Bart van den Eijnden
OSGIS, Open Source GIS
bartvde at osgis.nl
http://www.osgis.nl