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File:food-crop-production1-if-crop-choices.png: Difference between revisions
File:food-crop-production1-if-crop-choices.png (view source)
Revision as of 16:52, 5 March 2024
, 5 MarchUpdated the "preserve sums" syntax (it's '$' now, not '_')
(Food crop production - what it would be if mainly high-yielding crops were chosen. (Isochromic world map) (Projection: equirectangular/geographic)) |
(Updated the "preserve sums" syntax (it's '$' now, not '_')) |
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(Isochromic world map) (Projection: equirectangular/geographic) | (Isochromic world map) (Projection: equirectangular/geographic) | ||
==Methodology== | |||
Made from data: | |||
* [[:File:population.data-float64-8640x4320]] | |||
* [[:File:cropland.data-float32-4320x2160]] | |||
* [[:File:countries.data-int16-8640x4320]] | |||
* [[:File:yields-if-crop-choices.data-float64-895x1]] | |||
[[Code:isochromic.c|Image generator]] code: | |||
# load files | |||
pop << data/population.data-float64-8640x4320 # population counts | |||
crop << data/cropland.data-float32-4320x2160 # cropland fraction of land | |||
yield << data/countries.data-int16-8640x4320 # country codes | |||
yields << data/yields-if-crop-choices.data-float64-895x1 # crop yields in scenario (average kalories/day/acre) by country code | |||
yield [] yields # now 'yield' is a map of crop yields | |||
borders << data/borders-black-on-white.png | |||
# fill in blanks (default values) | |||
crop _= 0 | |||
crop >= 0 | |||
yield _= 12546.6943934817 # from food1.sql: SELECT SUM(production_kalories_per_day)/SUM(farmland_acres) FROM main WHERE region_name="World"; | |||
# scale everything to 2160x1080 | |||
pop @@ $width/4 | |||
pop @@ $height/4 | |||
crop @@ width/2 | |||
crop @@ height/2 | |||
yield @@ width/4 | |||
yield @@ height/4 | |||
borders @@ width/4 | |||
borders @@ height/4 | |||
# make the borders a bit fainter | |||
borders -= 1 | |||
borders *= 0.4 | |||
borders += 1 | |||
# calculate food production | |||
crop @@ density_to_quantity # now 'crop' is crop land in km^2 | |||
crop *= 247.10538 # now 'crop' is crop land in acres | |||
crop *= yield # now 'crop' is crop production in kalories/day | |||
# generate output... | |||
out.r := pop | |||
out.r /= 500000 # max people per pixel | |||
out.r @@ spread | |||
out.r @@ negative | |||
out.b := crop | |||
out.b /= 1250000000 # max kalories/day per pixel | |||
out.b @@ spread | |||
out.b @@ negative | |||
out.g := out.r | |||
out.g *= 3 | |||
out.g += out.b | |||
out.g /= 4 | |||
out.r *= borders | |||
out.g *= borders | |||
out.b *= borders | |||
out >> data/food-crop-production1-if-crop-choices.png | |||
Legend (html): | |||
<syntaxhighlight lang="html"> | |||
<table style="font-family:sans-serif"><tr style="line-height:2em"><td> | |||
<span style="background-color:#003FFF; border:1px solid"> </span> | |||
</td><td> | |||
Population | |||
</td><td> | |||
Total: 7.9 billion | |||
</td></tr><tr><td style="vertical-align:top"> | |||
<span style="background-color:#FFC000; border:1px solid"> </span> | |||
</td><td> | |||
Food crop production primary,<br /> | |||
if mostly high-yielding<br /> | |||
crops were chosen.<br /> | |||
<small>Read scenario:<br />https://<b>olam.wiki/Crop_choices</b></small> | |||
</td><td> | |||
Total: 74.6 trillion kalories/day | |||
</td></tr></table> | |||
</syntaxhighlight> | |||