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File:population-earth1.png: Difference between revisions
→Summary
(An Term:isochromic map of the world population, superimposed on a pastel-color background that shows land, water, and borders. Everything in black is population. Note: Some border lines may be completely obscured by populations (especially India's borders with Bangladesh, Pakistan, and Bhutan). Still better than the opposite (letting the border lines obscure the populations).) |
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Note: Some border lines may be completely obscured by populations (especially India's borders with Bangladesh, Pakistan, and Bhutan). Still better than the opposite (letting the border lines obscure the populations). | Note: Some border lines may be completely obscured by populations (especially India's borders with Bangladesh, Pakistan, and Bhutan). Still better than the opposite (letting the border lines obscure the populations). | ||
==Methodology== | |||
[[Code:isochromic.c|Image generator]] code: | |||
# load files | |||
pop << data/[[:File:population.data-float64-8640x4320|population.data-float64-8640x4320]] | |||
earth << data/[[:File:blue-marble-posterized.png|blue-marble-posterized.png]] | |||
borders << data/[[:File:borders-black-on-white.png|borders-black-on-white.png]] | |||
borders @@ negative | |||
# resize things to fit the 'earth' background | |||
pop :: _earth.r # the '_' preserves the total population | |||
borders :: earth.r | |||
borders *= 6 # brighten the lines | |||
# lighten the background | |||
earth.r += 0.6 | |||
earth.g += 0.6 | |||
earth.b += 0.6 | |||
# show the borders in white | |||
earth.r >= borders | |||
earth.g >= borders | |||
earth.b >= borders | |||
# show the population in black | |||
pop /= 800000 # max people per pixel | |||
pop @@ spread | |||
pop @@ negative | |||
earth.r <= pop | |||
earth.g <= pop | |||
earth.b <= pop | |||
# save | |||
earth >> data/population-earth1.png | |||