[R-sig-Geo] Long time listener, first time caller

[Michael Sumner]

I see the same on Windows 7 64-bit, with 32-bit R and 64bit R.

There's no need for the transpose/flip btw:

image(volcano)

but raster graphics don't product it, so it's the underlying image C
code (which is rect under the hood)

image(volcano, useRaster = TRUE)

plot(0, xlim = c(0, 1), ylim = c(0, 1))

rasterImage((volcano - min(volcano, na.rm = TRUE)) /
diff(range(volcano, na.rm = TRUE)), 0, 0, 1, 1, interpolate = FALSE)

plot(0, xlim = c(0, 1), ylim = c(0, 1))

rasterImage((volcano - min(volcano, na.rm = TRUE)) /
diff(range(volcano, na.rm = TRUE)), 0, 0, 1, 1)

I'd like to investigate more, but will have to wait for now.

Cheers, Mike.


On Fri, Jul 15, 2011 at 10:40 AM, Robert Hijmans <r.hijmans at gmail.com> wrote:
>> Lines appear to be a GUI issue, went back to 2.13.0 and plot of raster
> looks fine.
>
> When plotting a Raster* object, raster calls the 'image' function. spplot
> uses 'levelplot'. Both are affected by these white lines in R 2.13.1 on
> Windows, I think (anyone seeing this on Mac or Linux? or not seeing this on
> Windows?). Here is a simple test:
>
> image(t(volcano)[ncol(volcano):1,])
>
> In some cases there are only lines such that it seems that there are no data
> values. I would expect that this will be fixed soon, but I am changing
> 'raster' so that the next version calls 'rasterImage' (which is not affected
> and should be more efficient) in stead of 'image'.
>
> Please correct me if I am wrong, but I think that for now one should not use
> R 2.13.1 on Windows (and perhaps other OSs) if you want to plot raster data.
> Robert
>
>> sessionInfo()
> R version 2.13.1 (2011-07-08)
> Platform: i386-pc-mingw32/i386 (32-bit)
>
>
> --
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>
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-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner at gmail.com