Descent: 10 feet (3 m)
Description:
La Barranca connects Purissima Rd. and Elena. The climbing doesn't
start until near the the 280 underpass. It rises briefly before
the underpass, then drops briefly on the other side before beginning
the short steep run up to Elena.
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 -3% 410 start - Purissima
0.12 11% 430 12903 - short rise up to underpass
0.17 6% 450 under 280
0.21 -7% 450 short drop after underpass
0.23 6% 440 climbing starts
0.27 14% 470 gentle left bend
0.31 16% 490 gentle right bend
0.35 13% 530 13119 La Barranca - flattens here
0.38 2% 530 end - Elena Rd
Back to
Lucas's
cycling gradiometer page.
