[fdo-users] Basic FDO questions.

Greg Boone greg.boone at autodesk.com
Thu Apr 3 13:38:23 EDT 2008 

[GB2] 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 27, 2008 12:47 AM
To: fdo-users at lists.osgeo.org
Subject: RE: [fdo-users] Basic FDO questions.



Sorry for the delay in replying.
For me, being able to get the layer abstracts, and all meta properties is
essential.  The abstract could probably be easily made as a base property
along side the id and raster?

[GB2] The idea of exposing the Abstract as a new schema property has some merit. I would not be opposed to discussing this further.

>[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.

Are there any technical reasons for this?  For me this means sadly i cant
use FDO, for WMS at least.

[GB2] There are no explicit technical reason why additional WMS properties have not been exposed. If you would like to propose changes either to the exposed schema, or additions to the set of custom commands that the provider supports (in addition to the ones we added in FDO 3.3.0) I would be open to discussing those.

But is this a trend on the other providers as well?

>[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?

The exposed capabilities is adequate, just require access to all the
metaproperties of a layer.

[GB2] When you say metaproperties, the issue becomes a little clouded in my mind. The term is a little ambiguous. Which properties specifically are you looking to access? Can you provide examples? Are these properties common across all WMS servers?

The 2 wms servers i referenced:
http://onearth.jpl.nasa.gov/wms.cgi?
http://labs.metacarta.com/wms-c/Basic.py?

Thanks.



gregboone wrote:
>
> [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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