?hexbin may get you started.
Clint Bowman INTERNET: cl...@ecy.wa.gov
Air Quality Modeler INTERNET: cl...@math.utah.edu
Department of Ecology VOICE: (360) 407-6815
PO Box 47600 FAX: (360) 407-7534
Olympia, WA 98504-7600
USPS: PO Box 47600, Olympia, WA 98504-7600
Parcels: 300 Desmond Drive, Lacey, WA 98503-1274
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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