[R] sppolot: fill below minimum legend value

[Paul Hiemstra]

emorway wrote:
> In the plot below, there are some grid cells that have values below 10, which
> is the lowest "cut" value I have specified.  Is there a way, without
> adjusting the number of cuts, to tell R to fill in those cells with the
> lowest possible color (in this case greeen)?  There is a white "hole" in the
> image about a quarter of the way in from the left side, this is what I would
> like to correct.  Thanks...Eric
>
> The code:
> pts<-list("sp.points",K.dat,pch=3,col="black")
> cuts<-c(10,20,30,40,50,60,70,80,90,100,200,300,400,500,600,700,800,900,1000)
> spplot(lzm.krige.dir["var1.pred"],at=cuts,colorkey=list(at=log10(cuts),at=log10(cuts),labels=as.character(cuts)),scales=list(draw=TRUE),
> xlab="Easting",ylab="Northing",key.space="right",cex=1.1,col.regions=terrain.colors(30),main="Hydraulic
> Conductivity of Layer 2",sp.layout=list(pts))
>
> The image:
> http://www.nabble.com/file/p25392472/Image3.jpeg 
>   
Hi Eric,

As far as I know you need to set the lower value of cuts to the minimum 
of the dataset to prevent this white space from occuring. If you don't 
want to see this in the colorbar, you need to adjust it using the 
colorkey argument.

And a non-technical note, you e-mail doesn't give a lot of background 
regarding your problem. spplot is a function that is only used by people 
working with geographic data, which is probably a small subset of the 
total community. See the posting guide for some hints about what kind of 
information is necessary in an e-mail to r-help, for example a 
reproducible example. In addition, there is a mailing list specifically 
meant for geographic data, r-sig-geo, where you are more likely to get 
the answers you are looking for.

cheers and good luck,
Paul

-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul