[R-sig-Geo] SpatialPolygonsDataFrame visualization

[Mathieu Basille]

Thanks Rick for the hints.

I have to admit, however, that it is so far a huge failure. I have been 
able to play a bit with the color key (arg 'colokey' that sets the 
position, the colors, the tick marks, height & width, etc.) and the 
color of one map (arg 'col.regions', for finite values of the layer), 
but I'm still unable to
1) have different scales for different layers (i.e. one color key per 
layer);
2) color NA with a non-contiguous color from other finite values. From 
my different tests, NA are always white (I wish I could fill them in red 
for example, with finite values in a gradient of grey).

In addition, I'm totally lost in the help pages of xyplot and levelplot 
(lattice), and the graph gallery of sp didn't help neither.

Any other resource or tutorial for this?
Thanks in advance,
Mathieu.


Rick Reeves a écrit :
> Mathiu:
> 
> The attached use case might help: It is not exactly what you are looking 
> for, but the last map
> demonstrates use of the spplot function to create a 'display list' that 
> plots vector and raster
> data layers on a single map. Also some hints on creating a map scale and 
> legend.
> 
> http://nceas.ucsb.edu/scicomp/GISSeminar/UseCases/MapProdWithRGraphics/OneMapProdWithRGraphics.html 
> 
> 
> Regards,
> Rick Reeves
> 
> Mathieu Basille wrote:
>> Hello everyone,
>>
>> I'm not very familiar with visualization of spatial objects in R, 
>> especially with the possibilities of the spplot function...
>>
>> I have a SpatialPolygonsDataFrame and I'd like to obtain a map with a 
>> specific scale for each layer (not in the geographic space, but in the 
>> data), instead of the same one for every one. In my case, the layers 
>> represent different variables, not on the same scale (e.g. elevation 
>> and rain).
>>
>> Additionally, I'd like to represent NA's with a particular color (say 
>> black so that we can see immediately where they occur).
>>
>> I guess these 2 issues are somehow related, but I didn't manage to 
>> solve them. The help pages of spplot or xyplot didn't really help...
>>
>> Any hint how to do that?
>> Thanks in advance,
>> Mathieu.
>>
>>
>>  > version
>> platform       i486-pc-linux-gnu
>> svn rev        43537
>> version.string R version 2.6.1 (2007-11-26)
>> sp: sp_0.9-19


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                                                 ]
  Mathieu BASILLE -- PhD Student                 ]
                                                 ]
  Laboratoire de Biométrie et Biologie Évolutive ]
  Université Claude Bernard Lyon 1 - France      ]
   http://lbbe.univ-lyon1.fr/                    ]
                                                 ]
  My resume:                                     ]
   http://mathieu.basille.net/pro/               ]
  Habitat web-site:                              ]
   http://biomserv.univ-lyon1.fr/spip_habitat/   ]
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