[R-sig-Geo] plotKML coerce levels ?

[Tomislav Hengl]

Thanks Tom,

That is correct. If you use the "cut" command to convert to factors and 
then assign the labels, then you can assign any colours you like 
following the example from the plotKML tutorial:

 > data(worldgrids_pal)
 > pal = 
as.character(worldgrids_pal["corine2k"][[1]][c(1,11,13,14,16,17,18)])
 > plotKML(eberg_grid["LNCCOR6"], colour_scale=pal)

http://gsif.isric.org/lib/exe/detail.php?id=wiki%3Atutorial_plotkml&media=wiki:plot_factorvar.png

T. Hengl
http://www.wageningenur.nl/en/Persons/dr.-T-Tom-Hengl.htm

On 6-8-2013 20:14, Tom Philippi wrote:
> Florence--
> I might misunderstand your question, but I think that your problem is the
> type in your SpatialPixelsDataFrame, not your call to plotKML.  From what
> you describe, I assume that the values in your SpatialPixelsDataFrame are
> numeric.  If you want a specific color legend, you need to use a factor
> instead of a numeric.
>
> If your values in the SpatialPixelsDataFrame take exactly
> {2,4,10,30,60,100}, you may need to convert the values from numeric to a
> factor with factor().  If your values are numeric but take any value (e.g.,
> from 0 to 100), you may want to convert it to a factor using cut() with
> c(0,2,4,10,30,60,100).
>
> I hope that this helps and points you in the right direction.
> Tom
>
>
> On Tue, Aug 6, 2013 at 8:48 AM, TROUDE Florence
> <FTroude at air-rhonealpes.fr>wrote:
>
>> Dear list,
>>
>> I use the plotKML library to plot maps of simulation results (pollen maps).
>> It's quite great but I'd like to have some colors at some defined levels
>> such as :
>> 2 -> white
>> 4 -> green
>> 10 -> yellow
>> 30 -> orange
>> 60 -> red
>> 100 -> black
>>
>> my object is a SpatialPixelsdataframe or a SpatialGriddataframe.
>>
>> When I use plotKML with for instance data range from 0 to 10, I don't
>> menage to coerce the levels/colors of the map :
>> the color_scale always fit to the min/max of the data and don't fellow the
>> levels (2,4,10,30,60,100)...
>> I have tried colour_scale, colour, levels options but it doesn't work.
>>
>> Does anyone have encountered the same problem and fixed it ?
>>
>> Regards,
>>
>> Florence
>>
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