step-0 and step-1
step 2 - load csv
step 3 - join cities with population
step 4 - park centroids
step 5 - distances
step 6 - calculate where people go hiking
save output file
load polygons from postgis
calculate borders
save borders
save hikers for each park
calculate hiker density
create layer with hiker density
missing import
more text for hello world
parametrize the script
add missing imports
parametrize hiker_fraction too
fix step titles
rename step files