Descent: 30 feet (9 m)
Description:
The east side of Golden Oak Drive climbs up from Alpine Road (just
above Arastradero) to Peak Lane (which connects with Cervantes
Road). After Peak Lane, Golden Oak goes back down the hill to Alpine (see
Golden Oak (west)). Peak Lane, after a brief 30-foot rise, connects
with Cervantes, which can be descended (with Westridge) west to
Portola Valley Road.
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% 410 start - Alpine Road
0.02 8% 420
0.05 11% 430
0.08 10% 440
0.11 12% 460 465 Golden Oak
0.14 13% 480
0.17 18% 500 before Minoca Road
0.20 17% 520
0.22 19% 540 530 Golden Oak
0.24 17% 560
0.26 16% 580
0.28 13% 590 Bear Gulch Drive
0.30 13% 610
0.33 15% 630 415 Golden Oak
0.36 15% 650 405 Golden Oak
0.38 11% 660
0.42 8% 680
0.44 3% 690
0.46 2% 690
0.48 10% 690
0.50 16% 700
0.52 13% 720
0.54 7% 730
0.56 0% 730
0.59 0% 740 Tagus Court
0.61 6% 740
0.62 9% 740
0.63 15% 750
0.65 0% 760 top
0.68 -10% 760
0.71 -9% 740
0.73 0% 730
0.75 14% 740
0.77 15% 760 Peak Lane
Back to
Lucas's
cycling gradiometer page.
