Descent: 20 feet (6 m)
Description:
Joaquin Road is a short but steep road near the top of the paved
section of Alpine Road (east of Skyline). It climbs about 250 feet in
1/3 of a mile. The first few meters are gentle, but most of the
climbing hovers between 14% and 18%, with one short stretch hitting
20%.
Altimeter altitude
(Altitude linearly interpolated from altimeter
samples, and smoothed with a 0.04mi gaussian.)
Each horizontal line is 100 feet. Each vertical
line is 0.2 miles. Gradiometer grade
(Grade linearly interpolated from gradiometer
samples, and smoothed with a 0.04mi gaussian.)
Each horizontal line is 2% grade. Each vertical
line is 0.2 miles. Altimeter grade
(Grade linearly interpolated from altimeter
samples, and smoothed with a 0.20mi gaussian.)
Each horizontal line is 2% grade. Each vertical
line is 0.2 miles. Comparison of grades
(Green grade is from the gradiometer, magenta grade
is from the altimeter, and white is where they
overlap.)
Each horizontal line is 2% grade. Each vertical
line is 0.2 miles.
Overall (averaging my first 20 hills),
the gradiometer grade averages 0.63 (% grade)
higher than the altimeter grade, with a standard
deviation of 4.5 (% grade per road).
This error may be due to:
-
Uneven sampling -- I take more samples when the
hill gets steep.
-
Calibration error (of the gradiometer or
altimeter).
In the end, though, I think that each individual
sample is accurate to within about 2% for that
instantaneous segment of road. My results may
not always agree with my altimeter, but they are
generally repeatable within 1%. I think that
I just need to take more samples to generate
more accurate graphs.
Raw Data:
Dist Grade Alti. Location
---- ----- ------ --------
0.00 0% 1130 start - alpine Road
0.01 12% 1130
0.03 16% 1140
0.05 15% 1160
0.07 14% 1180 30 Joaquin - left turn
0.09 12% 1190
0.11 17% 1210
0.12 17% 1220 right turn
0.13 16% 1230
0.15 15% 1240 50 Joaquin
0.18 15% 1260
0.20 16% 1280 60 Joaquin
0.22 20% 1300
0.23 17% 1310
0.25 11% 1320 75 Joaquin
0.26 17% 1330 right turn
0.28 16% 1340
0.30 15% 1360
0.32 16% 1380
0.33 15% 1380
0.34 9% 1390
0.36 0% 1400
0.37 -13% 1390
0.38 0% 1380
Back to
Lucas's
cycling gradiometer page.
