[R-sig-Geo] First thoughts on spatio-temporal classes...

[Mauricio Zambrano]

Hi Blair,

I'm sorry but my late answer, but this is a complicated period for me ...

2009/9/18 Blair Christian <blair.christian at gmail.com>:
> Hi all,
>
> This is in response to an earlier post of mine inquiring about options for
> spatio-temporal classes in R.
>
> Thank you to all who replied for your interest in spatio-temporal data
> classes and methods.  There were many excellent comments in your emails.  I
> have been attending the SAMSI conference on space-time
> analysis<http://www.samsi.info/programs/2009spatialprogram.shtml>this
> week and have put together a summary (a working draft) of some
> thoughts<http://www.isds.duke.edu/%7Ejbc30/SpatioTemporal/workGroupComp.pdf>I
> have about classes.
>
> I also started a bare bones webpage:
> http://www.isds.duke.edu/~jbc30/SpatioTemporal/
>
> A also put up the latex source code and bib file I used if you are
> interested in making additions, corrections, or other.  Please email me any
> changes, and I'll maintain an RCS version of it.
>
> I'll put some plots up there when I have time to give you all an idea of
> what my context is.  Ironically, I can't ssh to the webserver from work (at
> the US EPA), so I can only update it from home.
>
>
> Here are some questions to you all:
>
> - What data do you have interest in analyzing?

I want to analyse long-term daily/monthly/annual hydrological time
series of temperature and precipitation, measured in point gauging
stations.

>
> - What type of code do you have to contribute?

I'm developing a package for management and interpolation of this type
of data, in which the temporal functions use the zoo package as
building block, and the spatial functions are mainly wrappers to the
krige function of the 'gstat' package and the autoKrige function of
the 'automap' package, aiming at easing this tasks to people with good
knowledge in hydrology and GIS, but little or no experience in R.
>
> - Are you interested in writing classes/methods?  If so, what is your
> background?  (I can provide several tutorials on S4 classes on the web that
> I found useful).

I'm interested in writing classes, but I have some experience with S3
classes and no experience with S4 classes, and I would appreciate if
you could share any material for reading about this.

>
> I will pass along these related packages as being related to spatio-temporal
> data:
> trip (trip class extends SpatialPointsDataFrame), pastecs, tripEstimation,
> hydrosalinity(?), PBSmapping(?), RadioSonde, STARIMA(?), Bayesian Vector
> Accumulation(?), spBayes(?), INLA (Havard Rue website)
>
> I skimmed a fair number of time related packages (more than just timeDate
> and chron), including xts, zoo, (tseries, timeSeries, ts, its, etc) as well,
> and came to the conclusion that it would best to allow either a time series
> type package (regular or irregular times) as well as a package for
> continuous time (functional data, like paths of animals, in the trip
> library), and I'm a fan of the fda
> library<http://ego.psych.mcgill.ca/misc/fda/>.
> It would be nice to have easy spline/FDA access for datasets where time is
> collected in a continuous manner rather than in the usual arima grid
> setting.

The very basic idea that I have in mind for implementing the
spatio-temporal classes for regular time series located in point
objects is to add a slot of 'zoo' and/or 'xts' type to the
'SpatialPointsDataFrame' class, but I have no idea about how to do it.

>
> With that information dump, I'll try and get another update out in about two
> weeks depending on my schedule, which should include any progress I've made
> that I'm satisfied with.  I will respond to individual emails as well.
>
>
> Cheers,
> Blair
>
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>
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>

So, if I can help in some way, you can count on me.

Kinds,

Mauricio Zambrano B.
-- 
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Ph.D. Candidate, 3rd year
University of Trento
Dept. of Civil and Env. Engineering
Trento / Italy
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