[R-sig-Geo] 3d surface plot of large data

[Alexander.Herr at csiro.au]

Dear list,

I am trying to plot a grid with an overlayed height. I have a dataframe
with four variables:
x,y,gridvalue,height. The dataframe has 2.5mio observations (ie grid
points),

I assign colors through the gridvalue using map_color_gradient thus
producing:
x,y,gridvalue,height,gridcol as variables of the dataframe.

My attempts with surface3d fail, mainly because I cannot produce the
matrix required for the height input. 

Any ideas/help appreciated
Thanks
Herry

Dr Alexander Herr
Spatial and statistical analyst
CSIRO, Sustainable Ecosystems
Davies Laboratory,
University Drive, Douglas, QLD 4814 
Private Mail Bag, Aitkenvale, QLD 4814
 
Phone/www 
(07) 4753 8510; 4753 8650(fax)
Home: http://herry.ausbats.org.au
Webadmin ABS: http://ausbats.org.au
Sustainable Ecosystems: http://www.cse.csiro.au/