Kings Mountain Road, Woodside map

Statistics:

Max. grade: 14% (16% on switchbacks)
Main climb:
Avg. grade: 6.8% (elev. gain/dist)
Length: 4.31 miles (6.93 km)
Elev. gain: 1540 feet (469 m)
Entire profile:
Avg. grade: 6.8%
Length: 4.32 miles (6.95 km)
Climb: 1540 feet (469 m)
Descent: 0 feet (0 m)

Description:

Starting at Greer Road, 0.1 mi and 20 feet above Tripp Road, Kings Mountain climbs through the redwoods of Huddart Park, up to Skyline. It offers plentiful shade, moderate grades, and occasional views. On weekdays, this can be a glorious climb, and a fun descent. On weekends the traffic can be annoying, but the scenery makes it worthwhile.

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	 3%	450	Greer Road
0.01	 7%	450
0.04	 8%	460
0.06	10%	470
0.07	10%	480	Entrance Way
0.09	 8%	490
0.11	 7%	500
0.16	 5%	515
0.18	10%	520
0.20	 6%	530
0.23	 6%	545
0.26	 7%	555
0.32	 7%	570
0.38	 8%	590
0.41	 8%	605
0.48	 8%	625
0.52	10%	640
0.55	 8%	650
0.58	 7%	670
0.64	 7%	680
0.67	 8%	700
0.70	 5%	710
0.73	 8%	720
0.77	 7%	730
0.81	 7%	750
0.87	 7%	770
0.92	 6%	790	right turn -- crosses over the creek
0.96	 4%	795	wooden water tank
0.98	14%	810	short rise
1.00	 6%	810
1.03	10%	820	short rise
1.05	 6%	830
1.09	 3%	840
1.12	 1%	850
1.16	 3%	850
1.19	 5%	860
1.25	 6%	860	first view
1.30	 8%	890
1.33	 6%	900
1.36	 6%	905	Huddart Park entrance
1.39	 8%	915
1.43	 5%	930
1.45	 6%	935
1.52	 6%	955
1.58	 7%	970
1.62	 4%	990	10mph left switchback
1.64	 6%	990
1.69	 7%	1010
1.72	 8%	1020
1.76	 5%	1035
1.78	 7%	1040
1.83	 6%	1060
1.89	 7%	1080
1.94	 8%	1100
1.98	 6%	1120
2.02	 4%	1130	rocky stream (staircase-like) to the right
2.06	 6%	1135
2.11	 8%	1150
2.16	 8%	1170
2.18	 5%	1180	approaching 15 mph right switchback cut into hill
2.19	16%	1180
2.20	 8%	1190
2.23	 6%	1195
2.26	 6%	1210
2.29	10%	1215	short rise
2.30	 4%	1220
2.33	 6%	1230
2.38	 8%	1245
2.40	 9%	1260	right switchback over creek
2.41	 7%	1260
2.45	 6%	1280
2.51	 8%	1300
2.54	 7%	1315
2.57	 8%	1320
2.62	 9%	1340
2.66	 8%	1360
2.68	 6%	1370
2.71	 8%	1380
2.75	 6%	1395
2.79	 8%	1410	road widens
2.83	 7%	1430
2.93	 8%	1465	large turnout on left
3.00	 7%	1500	road narrows
3.03	 8%	1510
3.06	 6%	1520
3.08	 8%	1530
3.10	 6%	1535
3.12	10%	1540
3.14	 7%	1550
3.20	 6%	1570
3.21	13%	1580	15mph right switchback
3.23	 4%	1580
3.26	 5%	1590
3.28	 7%	1590
3.31	 7%	1600
3.34	 7%	1610
3.37	 8%	1620
3.41	 8%	1640	zig to left
3.42	 3%	1650
3.43	16%	1655	zag to right
3.44	11%	1670
3.46	 7%	1670
3.49	 7%	1680
3.52	10%	1690
3.54	 6%	1710
3.57	 7%	1720
3.59	12%	1730
3.61	 9%	1740
3.64	 9%	1750	left turn 15mph, gated dirt road off to right
3.67	 4%	1760
3.70	 9%	1770
3.73	 8%	1780
3.77	 7%	1790
3.84	 6%	1820
3.90	 6%	1830
3.98	 4%	1860	white-post fence on right
4.00	 6%	1860
4.05	 7%	1885
4.10	 7%	1900
4.15	 7%	1915
4.17	12%	1920	short rise
4.19	 4%	1930
4.23	 4%	1950
4.25	 7%	1960
4.28	 8%	1965
4.31	 9%	1975
4.32	 9%	1990	Skyline

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