Descent: 0 feet (0 m)
Description:
The southern end of Crestview climbs up from Edgewood to Melendy in
San Carlos. The street is very wide and fairly straight, so the 30+
mph traffic can leave you room to climb. Over the summit, it drops
back down to Ralston Ave in Belmont. There is a barricade at the
Belmont/San Carlos border (where the name changes to Hallmark), but
bikes can pass through.
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 6% 280 start - Edgewood Road
0.04 9% 300
0.13 5% 330 1461
0.21 11% 350 speed limit 30 sign
0.26 15% 370 1347
0.30 15% 400 1325
0.35 16% 440 1307
0.42 15% 490 1291
0.45 15% 520 1261
0.50 16% 550 1231
0.54 1% 570 La Mesa
0.59 1% 580
0.65 1% 580 Brittan Ave
0.69 9% 590 1081
0.75 4% 610 1041
0.81 7% 630 1001
0.83 15% 640 995
0.88 13% 670 969
0.95 10% 720 935
1.00 11% 740 915
1.02 16% 760 909
1.05 14% 780 879
1.07 12% 790 Melendy
1.13 12% 820 795
1.17 6% 840 Coventry
1.27 10% 870 Normandy
1.31 5% 890 nice view
1.37 7% 900 Lewis Ranch Road
1.44 0% 910 top - 707 Crestview
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Lucas's
cycling gradiometer page.
