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GPS Units = Show road steepness?
Ralph Barone writes:
Radey Shouman wrote: Zen Cycle writes: On Sunday, March 10, 2019 at 6:35:02 PM UTC-4, Roger Merriman wrote: Sir Ridesalot wrote: Talking about GPS units on another thread reminded me of something else I wondered if they do. Does a bicycle GPS unit show you the steepness of roads? There's an area that I frequently ride where on road has short but very steep hills, another road a mile or so east of it has much more gradual hills whilst a third road to the west of the first one is a major highway that can be ridden with a bicycle. What I'm wondering is this: if someone unfamiliar with the area got there and used a GPS unit to show those three roads, would the GPS unit show them the different gradients of the roads? Or is that another function that they'd need to download or otherwise install? Cheers Various mapping sites will show the gradient, and some GPS units will show the gradient, in the same way that it can give improbable maximum speeds they can also give improbable max gradients or sometimes on very short ramps not notice it, there is a nasty little ramp nr my folks place, which is the software flattens claiming 12% when it’s a fair cruel 25/30% even more cruel this weekend with a 50mph headwind. It's probably an averaging issue - taking enough samples before and after the section so that it flattens the pitch. It's the same basic issue as the speedometer kerfluffle. Numerical differentiation amplifies noise. I would think it was the opposite. Numerical integration suppresses spikes. I would call that the converse. But turning altitude data, which is what is actually measured, into a gradient is differentiation. -- |
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