File:Northern Hemisphere snow cover.svg

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Summary[edit]

Self created image from public domain data found at http://climate.rutgers.edu/snowcover/files/wkcov.nhland.txt

Plot was generated by first calculating a simple average (A) for each week over the period 1980-2000. Then the weekly values where converted to anomalies by subtracting A.

The plot was then generated by gnuplot:

set terminal svg 
set font "Helvetica"
set output "plot.svg"
set multiplot
set xzeroaxis
set xlabel "Year"
set ylabel "Snow-cover\n5*10**6"
set title "Northern Hemisphere snow cover"
plot 'plot2' using 1:($2/5e6) with lines title "Anomalies" lt 1,\
     'plot2' using 1:($2/5e6) with lines smooth bezier title "Bezier smooth" lt 3

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