[R-sig-Geo] plot points in grid-plot with sp.layout

[Paul Hiemstra]

Paul Hiemstra wrote:
> Tom Gottfried wrote:
>> Hi list,
>>
>> the last plot in the following code ends up with error messages in 
>> the plot:
>>
>> data(meuse.grid)
>> data(meuse)
>> coordinates(meuse.grid) <- ~x+y
>> coordinates(meuse) <- ~x+y
>> meuse.grid <- as(as(meuse.grid, "SpatialPixelsDataFrame"),
>>     "SpatialGridDataFrame")
>>
>> spplot(meuse) # works
>> spplot(meuse, sp.layout=list(sp.points,
>>     meuse, col="red")) # works
>>
>> spplot(meuse.grid) # works
>> spplot(meuse.grid, sp.layout=list(sp.points, meuse)) # does not work
>>   
> works:                  ___________
> spplot(meuse.grid, sp.layout=list("sp.points", meuse))
>
> use quotes around sp.points. Or else it will look for the R object 
> sp.points, which is not present.
>
> cheers,
> Paul
in addition:

look at:

http://wiki.r-project.org/rwiki/doku.php?id=tips:spatial-data:spatial_data_visualization

for some more info.

cheers,
Paul
>
>>
>> What can I do to make the points being plotted on top of the grid?
>>
>> Thanks in advance!!
>>
>> Tom
>>
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>>   
>
>


-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul