Good morning. My global lightning data is just two columns labeled latitude
and longitude. Using library(maps), I plotted the world map and plotted
latitude and latitude as points. However, the frequency of lightning
occurrence and hence the points is so high that the plot looks more or less
like a blurred image, and makes it impossible for me to compare the
lightning flash density of the regions of the earth.

Instead of plotting these latitude and latitude as points on the surface of
the earth, lightning frequency per (number) region of the earth would make
more meaning to me.

 Is there a way I could divide the surface of the earth  and my longitude
and latitude data into equal-angle grid such that the number of lightning
events per a cell or a region of the earth are calculated and plotted. In
the expected plot, it would be easy for one to see at a glance that there is
say 200 or so lightning events at this part of the earth and 420 or so in
the other location of the earth. May I please paste part of the data here.

Whatever guide would be much appreciated.
Best wishes
Ogbos

lat          long
0.8312 95.2156
-3.3851 -65.3236
-3.2696 -65.2364
-3.2679 -65.2349
-17.6404 164.7025
-4.8285 148.8214
2.6477 -67.6568
-0.2350 -73.4833
-16.8655 40.9587
8.1179 -61.6474
-0.2755 93.3401
-17.1733 119.9011
1.1245 -69.7640
-20.0035 -149.3088
-3.4200 177.8753
3.0133 -67.5590
15.4684 -21.9331
-17.6166 120.2656
-17.3888 165.9368
-17.6953 164.7335
-1.8623 -74.0017
-3.3562 -71.1195
-11.5775 130.1496
-11.5720 130.4004
18.7159 -21.0251
-9.3788 -75.0815
-2.8341 -71.9095
-2.8276 -71.9380
-19.0845 166.5715
1.3692 -69.8615
1.0989 -69.8881
1.0351 -69.9390
1.3306 -69.9484
13.4238 -83.6240
-18.2490 165.4406
2.8831 -67.6648
3.0405 -67.4912

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