[R-sig-Geo] Lightning density map

[Edzer Pebesma]

On 02/25/2013 11:00 PM, Adrian Antonescu wrote:
> Hi,
>
> Two weeks ago I have asked a question regarding the use of R for plotting lightning density maps. Thanks to you answers I was able to go one step further.
> Attached is the .R script and a sample of the data. The script is counting the number of lightning strikes in hexagons, and then is plotting the hexagons over Europe.
> To obtain the lightning density I need the area of the hexagons. Could you please help me on how to calculate the area of the hexagons? Also, how can I obtain the
> number of days with lightning  in each hexagons?

 > unique(sapply(HexPolsDf at polygons, function(x) x at area))
[1] 6393744806 6393744806 6393744806 6393744806

I believe the number of days query was mentioned earlier on this list, 
Today -- you've ignore time so far, right?

>
> Thank you very much.
>
> Cheers,
> Bogdan
>
>
>
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de