plotKML on linux

On 30/04/2012 03:45, Daniel Arribas-Bel wrote:

Dear R-sig-geo list,

I have succesfully installed 'plotKML' 0.1-6 under Ubuntu 11.10-32bit
running R 2.15. I run into an error when I try to replicate one of the
examples in the documentation, particularly that of kml-methods
(http://plotkml.r-forge.r-project.org/kml-method.html). The first one
runs fine but when I try to plot a SpatialPixelsDataFrame:

## End(Not run)
# Plotting a SpatialPixelsDataFrame or a Raster* object
data(eberg_grid)
coordinates(eberg_grid)<- ~x+y
gridded(eberg_grid)<- TRUE
proj4string(eberg_grid)<- CRS("+init=epsg:31467")
## Not run:
kml(eberg_grid, colour = DEM, file ="eberg_grid-0.kml")



I run into the following error:

Error in paths(show.paths = TRUE) :
could not find function "shortPathName"


In fact, simply typing 'paths()' returns the same error. A bit of
googling seems to reveal the method 'shortPathName' appears to only
exist in the Win version of R, but not for linux/Mac.

Is plotKML supposed to work only under Windows? If not, am I mising
something? Is there any workaround?

plotKML is suppose to work on all operating systems. I do not have any
linux system at the moment at my disposal but only a Windows OS. Our
second developer (Pierre) only works on the Linux, so he should be able
to help you with this problem.

I discovered that the PNG file needs to be fixed for transparency
because there is a bug in Google Earth that does not allow transparency
of PNGs:
http://groups.google.com/group/earth-free/browse_thread/thread/1cd6bc29a2b6eb76/62724be63547fab7

The best I could figure out is to add transparency using ImageMagick.
See the source code at:

https://r-forge.r-project.org/scm/viewvc.php/pkg/R/layer.Raster.R?view=markup&root=plotkml


I think if your installation of the animation package is correct (if it
detects ImageMagick correctly) then your plotKML should not need to run
the 'paths' function.

I will try to test the scripts on Linux as soon as I come back to my
office next week.

thanks for your feedback!

T. Hengl
http://www.vcard.wur.nl/Views/Profile/View.aspx?id=37263

Any comment/suggestion is mostly welcome. Thanks very much in advance,

]d[


--
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Daniel Arribas-Bel, PhD.
Url: darribas.org <http://darribas.org/>
Mail: darribas at asu.edu <mailto:darribas at asu.edu>

GeoDa Center for Geospatial Analysis and Computation
(geodacenter.asu.edu <http://geodacenter.asu.edu/>)
Arizona State University (USA)
============================================================