Total elevation change in central park

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Anonymous's picture

does anyone know the aggregate elevation change for one lap in central park?

Anonymous's picture
Adam Jacobson (not verified)
That would be zero. (nm)
Anonymous's picture
andrew messick (not verified)

ha. ha. i didn't ask for net elevation change.

Anonymous's picture
Bob Shay (not verified)
Stats according to Delorme Topo 5.0 (2005 version)

For the full loop: not worth writing home about...
The highest points - just before tavern on the Green: 127.4 feet, at Engineers gate: 122feet (90th and 5th), and at 105th on the west side just after the peak of the hill: 123 feet. Lowest point at 110th street by the pool.

Distance - 6.37 miles
Climbing Distance - 3.30 miles
Decending Distance - 3.06 miles
Elevation Gain - -.5 feet (because I couldn't start/stop at the same point)
Climbing Elevation - 396.8 feet
Decending Elevation - 397.3 feet
Minimum Elevation - 27.9 feet
Maximum Elevation - 127.4 feet

Anonymous's picture
ted (not verified)

And someone posted on a different BB that delorme quoted harlem hill as an 18% grade.

Anonymous's picture
Bob Shay (not verified)
Grade of Harlem Hill

"I checked the Delorme 5.0 software for the grade of Harlem hill. This measure is from where the Fred Douglas Circle road intersects central park road(bottom of hill)to the top of the hill. It is a 44.9 foot vertical climb and a horizontal distance of 734.5 feet. Therefore, the grade is 6.1. Here is the calculation 44.9/734.5.

Hope this helps.


Definition (not mine) of Grade is below:

Grade -- steepness of hill
Most of us find that climbing up a 200-foot hill which is steep takes more out of us than a 200-foot hill which is gentle. A simple and very useful measure of steepness is ""grade"":

grade = vertical_climb / horizontal_distance

where both vertical_climb and horizontal_distance are both converted to the same measurement units. So if a hill goes up 264 feet in 2 miles, then we can first convert 2 miles to 10560 feet -- so the grade is then 0.025 = 264 feet / 10560 feet, which is 2.5%.

What does this ""grade"" number mean?

0% grade is exactly flat (and a negative grade, less then zero, is downhill).
2% grade does not seem very steep, but it's enough to substantially reduce forward speed, and for most riders it will absorb more than half their power output.
6% grade is enough to cut speed to well under half, and absorb more than 80% of a rider's power output (leaving less than 20% to fight air resistance and rolling friction).
10% grade, and anyone who is not a fit and frequent rider is off their bike walking -- and anyone who is not a racer is reaching for all the extra power they've got.


Anonymous's picture
rjb (not verified)

Harlem hill is not 6.1%. (4.4%, see Hank's stats for regional hill grades on this site). For what it's worth, my own HAC4 measurements consistently confirm this.

Anonymous's picture
Bob Shay (not verified)
Grade is a calculation...

Hank is right too. It all depends on where you want to measure the start of the hill.

Grade is a mathematical calculation of vertical distance over horizontal distance. Depending on where you start the measures will alter the result. I used the steepest part of the hill, starting at where the Fred Douglas Circle road intersects central park road, not the whole hill which really begins where the road exits the park right after the pool.

I checked Hank's calculation. It looks like he began the hill at it's lowest point, after the pool. The calculation at that start point, which by the way is very close to the minimum elevation of the loop, is 1,909 feet of horizontal distance and 84 feet of vertical distance - 84/1,909=.044. That is a 4.4 percent grade.

So, it all depends on what you want to call the beginning of the hill.


Anonymous's picture
Sonny (not verified)
Polar Reading

According to my polar altimeter, 220 feet of climbing per full lap around the park. While the readings on the polar can be inaccurate, the 220 feet of climbing is a consistent result after several hundred laps around the park.

Anonymous's picture
Christian Edstrom (not verified)
Accuracy vs. Precision

Trouble is, the several hundred laps proves the precision of the measuring instrument, not accuracy of the measurement.

That said, 220 feet sounds somewhat reasonable. Does anyone have an Avocet 50?

- Christian

Anonymous's picture
ted (not verified)

My usual is 210 to 230 feet on Avocet 50, Suunto, and Polar. I have seen as low as 180, so they are not perfect, but 220 sounds about right to me.

Anonymous's picture
af (not verified)
it's in the ride ;ibrary

Elevation for CP based on Delorme is in the NYCC ride library. (It shows 250 feet.)

Anonymous's picture
Basil A (not verified)
More opinions at..
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