Descent: 0 feet (0 m)
Description:
Together, these two short roads climb from Francis
Rd. (off Fremont) to Viscaino. Ascension has one steep turn to the
right that hits 22% on the inside for a few meters, but only 17% on
the outside. Anacapa has a straight run of about 100 yards at a
steady 17% grade.
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 4% 240 start - Concepcion Rd.
0.08 6% 270 26491 Ascension - getting steeper
0.14 13% 300 26451 Ascension
0.18 8% 320 before right bend
0.21 15% 340 before sharp right turn
0.23 17% 360 26444 (sharp right) 22% on inside
0.25 15% 370 flattening out
0.29 2% 390 before turning onto Anacapa
0.31 17% 400 26390 Anacapa (straightaway)
0.36 17% 440 end of steepest section of straightaway
0.41 13% 470 easing slightly
0.46 9% 500 flattens here
0.55 0% 520 top - Viscaino
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Lucas's
cycling gradiometer page.
