Tollgate Road, Saratoga map

Statistics:

Max. grade: 17%
Main climb:
Avg. grade: 9.8% (elev. gain/dist)
Length: 0.52 miles (0.84 km)
Elev. gain: 270 feet (82 m)
Entire profile:
Avg. grade: 9.8%
Length: 0.52 miles (0.84 km)
Climb: 270 feet (82 m)
Descent: 0 feet (0 m)

Description:

Starting from Hwy 9 (the flat section before the climbing begins), Tollgate begins with its worst grades, at 16-17% for 200 yards. Then it flattens out for a while, and then climbs a little more at a more modest 12-14%. Beyond this profile, Tollgate continues as a dead-end, but Saratoga Heights will take you to Pierce Road in another half mile.

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     8%     580	start - Highway 9                        
0.02    16%     590	"speed limit 25" sign                    
0.08    17%     650	21196 Tollgate                           
0.12    16%     680	end of steep section -- flattens out     
0.17     7%     700	gentle grade, rolling now                
0.30     0%     750	21359 Tollgate                           
0.41    14%     780	just started climbing again              
0.48    14%     840	"limited sight distance - 20 MPH" sign   
0.52     0%     850	Saratoga Heights                         


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