Hmmm... I'd be more inclined to just make the time a new attribute.
You can hardcode the attribute name, like we do in shapefiles with
'the_geom', call it 'timestamp' or something. If time is just an
attribute then we can use it straight away with GeoServer's KML Time
support - we have a template thing that lets you just enter the name of
the attribute to use. Raster data often does the time thing with 4
dimensions, but I feel like if you're working with vector data, as GPX
is, then you should just throw an extra attribute on. Elevation should
likely be handled the same way, perhaps in addition to doing it as a
third coordinate. But an attribute can make it clear that it's in fact
elevation, and not another type of 3d thing, like distance above the
ground or something.
best regards,
Chris
Bolla Péter wrote:
Hi,
I've comitted a new version of the gpx data store, that now uses
Justin's xml parser (so xstream and xpp dependency dropped). It's still
r/o, but write support is the next step.
I tried to add it to uDig, but failed to do so, so tested only with a
simple test case (loading a file, and printing the loaded feature).
If you feel like testing, give it a try!
I also had a discussion with Jody on how to implement the temporal data.
(in the gpx file every point of a track, so the nodes of a line segment,
has lon, lat, elevation and time data). This could be used when
visualizing the features. The easiest way might be to extend the JTS
Coordinate class, to support a 4. dimension, which can be the Date, and
create the geometries using these extended coordinates.
Has any of you worked with temporal data like this, or with any 4D data?
Or just any idea on how this could be best implemented?
Best,
Peter
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