[Geotools-devel] Measured geometries and dimension based slicing

[Andrea A. <and...@ge...>]

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?

Cheers
Andrea


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Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead

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