Club Drive, San Carlos map

Statistics:

Max. grade: 17%
Main climb:
Avg. grade: 8.8% (elev. gain/dist)
Length: 1.25 miles (2.01 km)
Elev. gain: 580 feet (177 m)
Entire profile:
Avg. grade: 8.4%
Length: 1.30 miles (2.09 km)
Climb: 580 feet (177 m)
Descent: 0 feet (0 m)

Description:

Club starts at Alameda and climbs up to Crestview. It starts at a maneageable 10% grade, flattens for a while, zooms up to 15-17%, and then flattens out again at the top. As you grunt up the steep section, you can admire the view of one of the few (the only?) remaining undeveloped canyons in Belmont. Overall, it would be a nice climb, if not for the often-speeding traffic, as it is one of the main access roads up to Crestview.

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:

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	 9%	 270	start - Alameda
0.03	14%	 290
0.06	 5%	 300	Bayview
0.10	 8%	 310
0.13	 9%	 320
0.15	11%	 340
0.19	 7%	 360
0.22	10%	 370
0.26	10%	 390
0.29	 8%	 400
0.31	 5%	 410
0.34	11%	 420
0.36	13%	 430
0.38	13%	 440
0.40	 3%	 460	5-way intersection
0.42	10%	 460
0.45	 8%	 470
0.49	 9%	 480
0.53	11%	 500
0.56	14%	 520	Shratton Ave.
0.58	13%	 530
0.60	 6%	 540
0.64	 8%	 550
0.66	13%	 560
0.68	10%	 570
0.70	 7%	 580
0.77	 5%	 600
0.83	 6%	 610
0.87	 9%	 630
0.89	17%	 640
0.91	16%	 660	296 Club Drive
0.93	15%	 670	above Witheridge Road
0.95	15%	 690
0.97	16%	 700
0.99	15%	 710
1.01	15%	 720
1.03	15%	 740
1.05	14%	 750	Nice view
1.08	10%	 770
1.11	 9%	 790
1.14	 9%	 800
1.19	 9%	 820
1.22	 8%	 840
1.25	 7%	 850
1.28	 4%	 850
1.30	 3%	 850	end - Crestview

Back to Lucas's cycling gradiometer page.