Descent: 20 feet (6 m)
Description:
Melendy Drive is yet another residential street that
climbs from Alameda up to Hillcrest. The grade varies widely, from
17% sections to flat sections. It even ends with a downhill.
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% 210 start - Alameda
0.01 3% 210
0.03 3% 210
0.05 11% 220
0.09 11% 240
0.12 13% 260
0.14 13% 280 2428 Melendy
0.17 12% 290
0.19 13% 300
0.22 15% 320 2452 Melendy
0.25 8% 340 Heather Drive
0.26 14% 340
0.30 15% 370 2504 Melendy
0.32 10% 380
0.34 2% 380
0.38 3% 390
0.40 6% 400
0.42 14% 410
0.45 15% 430
0.47 5% 430
0.49 9% 440
0.53 9% 460
0.56 11% 480
0.58 14% 490
0.61 15% 520
0.64 17% 540 right bend above 2780
0.65 13% 550
0.67 8% 560 Portofino Road
0.68 14% 560
0.69 16% 570
0.71 8% 580
0.73 6% 590
0.77 6% 590
0.80 1% 600
0.85 1% 600
0.91 0% 610
0.93 8% 610
0.94 15% 620
0.97 15% 640 before Peccadilly Court
1.00 14% 660
1.04 15% 690
1.06 16% 700 3730 Melendy
1.08 12% 710
1.10 7% 720 Cabot Court
1.11 15% 730
1.13 16% 750 3308 Melendy
1.15 16% 760
1.19 16% 780
1.22 0% 800
1.33 1% 810
1.36 5% 810
1.38 4% 810
1.39 0% 820 top
1.42 -10% 810
1.45 -11% 800 end - Crestview Drive
Back to
Lucas's
cycling gradiometer page.
