Well... my reason is that I don't really understand the use case :) but the
approach sounds reasonable to me.
On Thu, Mar 29, 2012 at 1:48 PM, Andrea Aime
<[email protected]>wrote:
> On Tue, Mar 27, 2012 at 7:39 PM, Andrea Aime <[email protected]
> > wrote:
>
>> Hi,
>> I'm looking into a funding opportunity that might bring some measured
>> geometries support in Geotools.
>>
>> The requirement I have is to be able to handle measured linestring,
>> stored in postgis, the measure in question is a time,
>> feature also has, as explicit attributes, the absolute times of start and
>> end,
>> while the measure is teh relative time in seconds since the start point.
>> Those need to play in a GeoSever WMS + time support so that when
>> a time interval is chosen, the features intersecting it are selected
>> (this we already have) but also that they are sliced so that only the
>> points within the linestring that are between the chosen stand and end
>> time show up (time based geometry slicing)...
>> and oh, possibly using a native postgis function to do the slicing, too
>> :-)
>>
>> Laundry list:
>> - be able to advertise that a geometry is measured and eventually
>> load the measure, at least in postgis, but with a mechanism that
>> is not postgis specific. For this one I was thinking to mimim the
>> "partial 3d support"
>> http://docs.codehaus.org/display/GEOTOOLS/Partial+3D+data+support,
>> adding a new metadata entry in the geometry descriptor, "MEASURED",
>> marking that the geometry is measured
>> - slice natively, but also recognize native slicing is not there, and
>> be able to do it in memory instead. For this I was thinking about
>> a query hint, that can be either supported by the store, or not.
>> SLICE_INTERVAL would be the name and the value is a bean
>> with (startMeasure,endMeasure,attributeWithStartValue)
>>
>> Do you believe something like the above would be ok to implement
>> on trunk?
>>
>>
> Shall I assume the lack of feedback means there is no particular
> opposition to the plan above? :-)
>
> Cheers
> Andrea
>
> --
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> Ing. Andrea Aime
> GeoSolutions S.A.S.
> Tech lead
>
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>
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>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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