Descent: 0 feet (0 m)
Description:
Summit Springs is a dead-end road that starts from Tripp
Road in Woodside, between 84 and King's Mountain. The steepest
section is a sweeping left-hand turn about 3/4 of the way up. The
grade on the uphill side of the road (outside of the turn) hits 23%,
and the grade on the inside of the turn is 26%. The beautiful scenery
and very low traffic make this a very nice climb.
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 5% 440 start - Tripp Rd.
0.03 15% 460 430 Summit Springs
0.08 16% 490
0.12 12% 520 450
0.17 13% 560 460
0.20 10% 570
0.22 2% 570 before right turn
0.25 17% 590 470 (right turn)
0.26 20% 600 still right turn
0.27 21% 610 end of right turn
0.29 17% 620 start straightaway
0.32 19% 660 end straightaway
0.36 13% 680 after left bend
0.38 10% 690 at Patrol Road
0.42 11% 720 505
0.44 17% 740 right bend
0.47 14% 750 515
0.53 12% 780 entering steep left turn
0.56 17% 810 560
0.58 23% 830 555 (26% on inside of turn)
0.60 21% 850
0.62 18% 870 leaving left turn
0.64 14% 880 entering right turn
0.66 16% 910 595
0.71 14% 940 dead end
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Lucas's
cycling gradiometer page.
