Hello Tim,
Hello,
often, geographical data has a time component. Some examples:
* timeseries of water levels at rain gauges within a catchment area
* development of a population in a town
Is there already a plugin in place which lets the users associate such
type of feature data to a geographic feature such as a point (showing
the location of the rain gauge or the city)?
Are you able to store your data in a PostGIS database? If so, you could
certainly have tables of your time series, and tables for your
geographic attributes, and link them together with a common ID or attribute.
I am not talking of the "normal" GIS attribute table because these refer
to the geographic attribute data. they normally do not contain a time
component (4 dimesion).
What I've always done in the past is simply stored the time series as a
series of fields in the attribute table. This only allows you to store a
time series of a single variable in the table, but if that's all you
need it works fine. This is what I do for the majority of my spatial
time-series work when not using PostGIS tables.
Finally, you could certainly do this is R, where you store a time-series
object in the data.frame of the layer. However, this may not be a viable
solution for extremely large layers, as the layer (and data) must fit
into memory.
Cheers,
Carson
--
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation (NCG),
Email: [email protected]
Web: http://www.carsonfarmer.com/
http://www.ftools.ca/
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