Golden Oak Drive (East side), Portola Valley map

Statistics:

Max. grade: 19%
Main climb:
Avg. grade: 10.2% (elev. gain/dist)
Length: 0.65 miles (1.05 km)
Elev. gain: 350 feet (107 m)
Entire profile:
Avg. grade: 10.1%
Length: 0.77 miles (1.24 km)
Climb: 380 feet (116 m)
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:

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.