Re: [R] How to plot raster obtained from readRAST6 in grey scale?

From: Roger Bivand <Roger.Bivand_at_nhh.no>
Date: Sat, 08 Mar 2008 12:09:55 +0000 (UTC)

Uwe Ligges <ligges <at> statistik.tu-dortmund.de> writes:

>
>
> Rainer M Krug wrote:
> > Hi
> >
> > I have a raster which I would like to plot in a greyscale instead of
> > colour. Is this possible, and how?
>
> Probably, and we may tell you how given you tell us what "raster" means:
>
> > ?raster
> No documentation for 'raster' in specified packages and libraries:
> you could try 'help.search("raster")'

It is possible that this is a spatial object, like a digital picture, so the function or method used may have been image(), and the relevant argument was col=. It would help greatly if the question was rendered in R:

"I have an object X:

str(X, max.level=1, give.attr=FALSE)

which I would like to plot in a greyscale instead of colour:

image(X)

Which arguments to method "image" should I use?"

However, re-phrasing answers the question to ?image and probably then to "Where are greyscale colours?" then to help.search("grey") so to gray.colors?, and avoids the posting altogether.

If the method is spplot in package sp, the same would hold. In any case, for spatial data (raster is a rather spatial incantation) the R-sig-geo list might be more suitable.

Roger

>
> Uwe Ligges
>
> >
> > Thanks
> >
> > Rainer
> >
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sat 08 Mar 2008 - 12:16:12 GMT

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