[Chameleon] Only a subset of points showed up on a layer

[Paul Spencer]

Stephanie,

there are a number of places that this could go wrong.

First, if you are using contexts then you are using WMS layers, not WFS. 
  If you are supplying a WFS as the online resource of a layer in the 
context file then it will likely not work at all, or perhaps only 
partially.  MapServer may interpret the results correctly due to how it 
attempts to load data using multiple drivers.  But I don't think it 
would work in this case.

Another possibility is differences in projection or location in data. 
When you view the wms image, it will show you all the data.  Is it 
possible that the extents that you are viewing in the chameleon 
application are limiting the points spatially and that the result is 
actually correct?  If only some points show up and they are not in the 
right place then it may be a projection issue.

Cheers,

Paul

Choi,Stephanie [Ontario] wrote:

> Hi all,
> 
> I am working on a mapserver demo using chameleon.  I have tried the 
> Oracle connection using virtual spatial data access method on each of 
> the layers in my mapfile and they all work okay.  Right now I am trying 
> to add another layer using Connection Type as WFS and use its GML file 
> as data source.  I tested the mapfile using shp2image and it works 
> correctly and it outputed a correct image, too.  And then I tested it 
> thru a browser running as WMS service.  It works okay too.  However, 
> when I tried to add this layer to chameleon by modifying 
> gmap_context.xml and then run CWC2 instance, the addition layer did show 
> up; however, on this layer, only a subset of the points showed up.  I 
> just wonder where are those points go ?  From my understanding, 
> gmap_context.xml file is only a context file for chameleon that allow 
> adding remote layers to the result images.  So, the actual part to 
> create layers is from the remote map servers.  However, I have already 
> test this new layer and it has been created correctly from my 
> mapserver.  So right now I really have no clue on this problem.  I am a 
> newbie on all this GIS stuffs.  If I misunderstood anything, please 
> point me out.  Any help would be greatly apprieciated.
> 
> Thanks,
> Stephanie  
> 

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|Paul Spencer                           pspencer@dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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