[R-sig-Geo] really slow plot of Portugal

[Jon Skoien]

Hi Augustin,
I guess this is related to the complexity of the border. Switzerland is 
defined by some nice lines (although not as simple as some of the 
borders in Sahara), Portugal and Spain have coastlines which can be 
rather complex, including their islands. Setting
prt = gadm
che = gadm
after downloading each of them, I get:
 > object.size(che)
63296 bytes
 > object.size(prt)
8013800 bytes
The SpatialPolygonsDataFrame-object of Portugal is 126 times the 
corresponding of Switzerland, additionally I guess there is also some 
non-linear scaling of the plotting time. To reduce plotting time for 
Portugal and Spain, you can try gSimplify from rgeos.

Cheers,
Jon





On 9/16/2014 2:11 PM, Agustin Diez Castillo wrote:
> Hi,
> I don�t know if this is related with the crisis, but Switzerland works wether Portugal or Spain take forever and even freezes R. Same with spplot. Any clues?
> # Switzerland
> library(sp)
> con <- url("http://gadm.org/data/rda/CHE_adm0.RData")
> print(load(con))
> [1] "gadm"
> close(con)
> plot(gadm)
> system.time(plot(gadm))
>    user  system elapsed
>   0.026   0.001   0.028
> system.time(spplot(gadm))
>    user  system elapsed
>   0.022   0.000   0.022
>
> #Portugal, sometimes the session got halted for a while, even with the system claiming that R is not responding (in mac)
> con <- url("http://gadm.org/data/rda/PRT_adm0.RData")
> print(load(con))
> close(con)
> [1] "gadm"
> system.time(plot(gadm))
>    user  system elapsed
> 556.032   1.133 565.243
>
> #Spain
> con <- url("http://gadm.org/data/rda/ESP_adm0.RData")
> print(load(con))
> [1] "gadm"
> close(con)
> system.time(plot(gadm))
>    user  system elapsed
> 62.595   0.237  62.974
>
> sessionInfo()
> R version 3.1.1 Patched (2014-07-13 r66131)
> Platform: x86_64-apple-darwin10.8.0 (64-bit)
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] rgeos_0.3-6     maptools_0.8-30 sp_1.0-15
>
> loaded via a namespace (and not attached):
>   [1] colorspace_1.2-4 digest_0.6.4     dismo_0.9-3      foreign_0.8-61   ggplot2_1.0.0    grid_3.1.1       gtable_0.1.2     lattice_0.20-29  MASS_7.3-33
> [10] munsell_0.4.2    plyr_1.8.1       proto_0.3-10     raster_2.2-31    Rcpp_0.11.2      reshape2_1.4     scales_0.2.4     stringr_0.6.2    tools_3.1.1
>
>
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>
>
>
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-- 
Jon Olav Skøien
Joint Research Centre - European Commission
Institute for Environment and Sustainability (IES)
Climate Risk Management Unit

Via Fermi 2749, TP 100-01,  I-21027 Ispra (VA), ITALY

jon.skoien at jrc.ec.europa.eu
Tel:  +39 0332 789205

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