spacetime::stplot: problem overlaying a SpatialLines object over a STIDF points map

Hi Edzer,


Thanks for your answer.

stplot(ciotat.t) gives a good result:
http://www.imagup.com/data/1128936911.html

It represents evolution of urbanization along time, each point being the
date and location of the first building for the city "La Ciotat".

The object is irregular because each spatial location appears one time. I'd
like to overlay the city contour of "La Ciotat" to better vizualize it.
http://data.imagup.com/10/1128936911.png

I've sent on your email my STIDF object ciotat.t and my SpatialLines object
contour I want to be overlaid, if you have some time to look after it.

Thanks a lot,


Mathieu

2011/8/25 Edzer Pebesma <edzer.pebesma at uni-muenster.de>

Hi Mathieu,

the idea behind stplot is indeed that it should be as easy as spplot,
hence its name. This idea is however much easier than practice, as the
number of possible (and useful) plots for S/T data might be quite large.

I would be helpful if you could provide (or generate) a simple data set
of your type (STIDF), explain what it represents, and tell how you'd
want it to be plotted. Does stplot(ciotat.t) give what you want, i.e. is
passing the sp.layout the only problem?

Best regards,
--
Edzer


On 08/25/2011 10:12 AM, Mathieu Rajerison wrote:

Hi,


I have a STIDF points object named ciotat.t that I've tried to plot with

a

city contour named contour.

I tried this but it doesn't work:

stplot(ciotat.t, sp.layout= list("sp.lines", contour))

Also, this doesn't work:

stplot(ciotat.t, panel=function(...) {

   sp.lines(contour)
   panel.pointsplot(...)
 })

I thought it was as easy as with spplot.The documentation tells that
arguments are passed on to spplot in case of stplot.STFDF, and to xyplot

in

case of
stplot.STIDF. So, the method may be a little different in my case

(STIDF)?

Any help would be appreciated,

Mathieu

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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

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