[R-sig-Geo] Lightning density map

[Clint Bowman]

?hexbin may get you started.

Clint Bowman			INTERNET:	clint at ecy.wa.gov
Air Quality Modeler		INTERNET:	clint at math.utah.edu
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On Fri, 15 Feb 2013, Bogdan Antonescu wrote:

> Hi ,
>
> I am trying to plot a cloud-to-ground lightning density map for Romania. The 
> data set contains: date(year/month/dat), time(hh/mm/ss), latitude, and 
> longitude for each lightning flash. The density maps were based on dividing 
> the study area into a grid cells (e.g., 20-km to correspond with the audible 
> range of thunder). I have used ArcGIS to calculate a density value for each 
> cell by counting the number of lightning flashes within the cell and dividing 
> by the cell area. The density value (flashes km−2) is then assigned to each 
> cell.
>
> Can someone help me on how to do this in R?
>
> Thank you very much,
>
> Bogdan
>
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