[fdo-users] Basic FDO questions.

[Greg Boone]

[GB] See inline...

-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of ssakharov
Sent: Thursday, March 20, 2008 7:59 AM
To: fdo-users at lists.osgeo.org
Subject: RE: [fdo-users] Basic FDO questions.



I probably didnt ask the question very clearly.  So far all the wms servers
i've connected to, the only properties for feature classes that i have been
able to retrieve were the baseproperties, 1) id and 2) raster.  The
getproperties command always returns 0 properties.  This might be because
the jpl and metacarta wms servers dont supply any other properties, i just
want verification that i should be able to get access to all the properties
supplied by the wms server.  As i havent been able to see this yet.

[GB] From an FDO Feature Schema perspective, only the ID and Raster properties are available. No other WMS properties will be exposed as schema properties.

Secondly when i use other tools to connect to wms servers, the layers
provide an abstract (detailed info ).  I can see this info on the jpl wms
when i connect via gvSIG.  But i cant seem to get the same info from FDO.
The description field on the fdo feature class matches the wms layer title,
not the abstract.

[GB] Correct. This is how it has been coded. The abstract info is not available through the Schema definition.

Hope that makes more sense :)

[GB] If you want other meta properties exposed, or WMS server capabilities exposed, please detail those properties in detail and I can evaluate. Also, can you send me the http addresses for the WMS servers you reference?


gregboone wrote:
>
> What WMS capabilities info do you need? Once I fix the defect, you will be
> able to get
>
> 1) image format types
> 2) supported CRS names
> 3) style names
>
> What else is required?
>
> Greg
>
> -----Original Message-----
> From: fdo-users-bounces at lists.osgeo.org
> [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of ssakharov
> Sent: Wednesday, March 19, 2008 11:03 AM
> To: fdo-users at lists.osgeo.org
> Subject: RE: [fdo-users] Basic FDO questions.
>
>
>
> Thanks that clears things up a lot for me.  Can you guy give me any more
> info on my first question? this is currently a show stopper for me.
>
> Thanks again.
>
>
>
> Orest Halustchak wrote:
>>
>> Regarding spatial contexts, the active spatial context is not used and is
>> deprecated. The spatial context association on raster and geometric
>> properties is the correct way to associate these properties. All geometry
>> and raster is returned using the coordinate system described in the
>> associated spatial context. Spatial filters used in expressions need to
>> be
>> in the spatial context of the geometry property being filtered.
>>
>> Thanks,
>> Orest.
>>
>> -----Original Message-----
>> From: fdo-users-bounces at lists.osgeo.org
>> [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of ssakharov
>> Sent: Sunday, March 16, 2008 8:55 AM
>> To: fdo-users at lists.osgeo.org
>> Subject: Re: [fdo-users] Basic FDO questions.
>>
>>
>>
>> And question #7
>>
>> 7) Spatial contexts, this one I cant seem to grasp.  The get spatial
>> context
>> command returns all the available contexts.  The active spatial context,
>> does this apply to just intersect filters, and setting bounds on rasters,
>> or
>> is all info retrieved via the schema in the current active spatial
>> context?
>> and if i set a new spatial context as active, is all spatial data from
>> the
>> provider reprojected to match.
>> Also how does this relate to the spatial context association on raster
>> and
>> geometric properties, can rasters from the same schema have different
>> spatial contexts?
>>
>> Thanks
>>
>>
>>
>>
>> ssakharov wrote:
>>>
>>>
>>> Hey all,
>>>
>>> I am in the process of evaluating FDO for my gis application.  I am
>>> stuck
>>> with C#, so thankfully FDO has Managed bindings.  So far I have been
>>> playing with the WMS provider, and mostly with success.  But i cant seem
>>> to find answer for some questions, hopefully you guys can help me out
>>> here.  Most of my questions revolve around the WMS provider as its the
>>> only one I ve played with so far.
>>>
>>> 1) Can i get access to all the layers meta properties, so far using the
>>> jpl and metacarta WMS servers i can only seem to ever get 2 properties,
>>> i)
>>> the id, and ii) the raster property.  Is this just cause the WMS servers
>>> I
>>> am hitting don't provide any more properties?  Also the abstract that
>>> most
>>> WMS servers provide?
>>>
>>> 2) The WMS provider seems to support reprojecting, (through the override
>>> raster definition, but i havent tested this yet) I imagine this is cause
>>> WMS in general support reprojecting, do the other providers support
>>> this?
>>>
>>> 3) I dont understand the abstract feature i get in the WMS schema's,
>>> this
>>> is probably just my stupidity.
>>>
>>> 4) Is there a significant performance hit in general using FDO.
>>>
>>> 5) Has anyone written more tutorial info for FDO, i find my self looking
>>> to the unit tests for info.
>>>
>>> 6) Do any of the spatial db providers, provide support for rasters in
>>> the
>>> db, or just geometry?
>>>
>>>
>>>
>>>
>>>
>>>
>>
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