[R-sig-Geo] spplot : varying dots for multiple parameters

Edzer Pebesma edzer.pebesma at uni-muenster.de
Mon Dec 14 08:02:24 CET 2009

servet ahmet çizmeli wrote:
> Dear all,
> I am new to R and sp. Thanks for your patience. I did several hours of research
> in various places. This list is my last resort.
> I am trying to plot on a spatial map the punctual measurements of the
> data located in the file (https://opengeo.metu.edu.tr/test.csv). I'd like to do
> that with the tools in the lattice package as I will add more parameters on the
> same graph later. When I call spplot using the code given below, I get the
> warning:
> Warning messages:
> 1: In if (!x$aspect.fill) panel.height[[1]] <- x$aspect.ratio * panel.width[[1]]
> :
>   the condition has length > 1 and only the first element will be used
> 2: In if (layout.respect) { :
>   the condition has length > 1 and only the first element will be used
> 3: In heights.x[pos.heights[["panel"]]] <- heights.settings[["panel"]] *  :
>   number of items to replace is not a multiple of replacement length
> Question 1 : I did several trials but could not eliminate this warning. Is this
> serious?
I don't see them, maybe update the sp package helps?
> Question 2 : Only the dots of the parameter "SPM" varies with its magnitude. How
> to make the other parameters also have varying dot sizes?
I don't think spplot allows this; you'd have to use lattice' function
xyplot, to which spplot (for points) is a rather thin wrapper.

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

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