[R-sig-Geo] class for georeferenced time series

[Edzer Pebesma]

Dear Wouter,

as to your question on related work, Blair Christian has started two
threads on this list:

https://stat.ethz.ch/pipermail/r-sig-geo/2009-September/006435.html
https://stat.ethz.ch/pipermail/r-sig-geo/2009-September/006491.html

and the resulting work is now at r-forge, called spt, see
http://r-forge.r-project.org/projects/spt

it is a mix of classes and methods for spatio-temporal data and
functions that are needed for his particular research domain. It has a
vignette.

For the two suggestions you make I cannot say much; if you have running
prototypes I'd be happy to look at them.

Simply adding an sp object to a time series (as attribute) [or a set of
time stamps to an sp object] means that you'll sacrifice the
multi-atribute space for multiple spatial entities [time entities], so
your objects become univariable. That might only work as a short-term
solution; next time you'll want to work with water chemistry data.

Best regards,
--
Edzer

Wouter Buytaert wrote:
> 
> Hi all,
> 
> this question is mainly aimed at the developers of sp, but any feedback
> is welcome.
> 
> We are designing some classes for hydrological modelling in R (the
> r-hydro package on R-Forge) and facing the decision of how to design a
> class for georeferenced time series (e.g., a precipitation or river flow
> series, the first referring to a point and the second to an area).
> 
> We're considering an xts time series with an sp object as attribute, but
> there may be other options (xts as data slot in an sp object for
> instance) that may be preferrable for reasons beyond my knowledge. Also,
> there may be similar efforts underway of which we have no knowledge.
> 
> cheers
> wouter
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de