class for georeferenced time series
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 M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de http://www.52north.org/geostatistics e.pebesma at wwu.de