Database Reference
In-Depth Information
Inthepreviousscreenshot,wecanseethedifferencebetweenthebicyclingdistance
acrosstherealroadnetwork,shadedinblue,andtheequivalent4milebuffer,or"as
thecrowflies"distance.Let'sapplythistoourdemographicanalysis,usingthefol-
lowing script:
SELECT
ROUND(SUM(chp02.proportional_sum(ST_Transform(a.geom,3734),
