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rochoa/speed.sql

Forked from javisantana/speed.sql
Last active August 29, 2015 14:27
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speed from a track table
Raw
speed.sql
WITH deltas as (
SELECT
st_distance(the_geom::geography, lag(the_geom::geography, 1) over(order by timestamp)) as ddist,
timestamp - lag(timestamp, 1) over(order by timestamp) as dt
from out_2 offset 1000
)
select avg(ddist/dt) as speed from deltas
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