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Re: Distance - geodesic - Vincenty - very accurate [message #25947 is a reply to message #25944]

Sun, 21 March 2010 10:41

nlneilson is currently offline

nlneilson
Messages: 644
Registered: January 2010
Location: U.S. California. Mojave &...

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Mindtraveller wrote on Sun, 21 March 2010 08:44

Cool.
What is the accuracy/drift of your calculations?

The Vincenty formulas are VERY accurate. With the Python code running it through a series of locations using the
Inverse formula and the returned values input to the Direct formula the result coincided usually to 10 decimal places
but did not exceed +/- 1 in the 9th decimal place. 9 decimal places is one billionth of a meter. The accuracy will not be
affected by the calculations. The accuracy of data input for locations, distance and starting angle, for all intent and
purposes, will determine the accuracy of the output.

The calculations are just math, no drift. Any "drift" would come from the input data.

Here is data on Tectonic Plate velocity or "drift"
http://hypertextbook.com/facts/ZhenHuang.shtml
using 5 cm per year
.05 / (365 * 24 * 60 * 60) = meters per second so the code
Distance<<=Format("m/sec %.9f", .05 / (365 * 24 * 60 * 60));
returns m/sec 0.000000002
2 in the 9th decimal place so it would take only 5 sec to make a
change in the 8th decimal place. 8 decimal places is the highest I have in the Distance app.

[Updated on: Sun, 21 March 2010 10:43]

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[Message index]

		Distance - geodesic - Vincenty - very accurate By: nlneilson on Thu, 18 March 2010 03:37
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 20 March 2010 02:24
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Sat, 20 March 2010 08:23
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 20 March 2010 15:39
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Sat, 20 March 2010 21:31
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 20 March 2010 22:21
		Re: Distance - geodesic - Vincenty - very accurate By: Didier on Sat, 20 March 2010 22:29
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 21 March 2010 00:52
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Sun, 21 March 2010 07:57
		Re: Distance - geodesic - Vincenty - very accurate By: Mindtraveller on Sun, 21 March 2010 08:44
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 21 March 2010 10:41
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Sun, 21 March 2010 18:11
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 21 March 2010 20:22
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 21 March 2010 22:10
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 21 March 2010 10:12
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Mon, 22 March 2010 22:20
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Mon, 22 March 2010 22:24
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Mon, 22 March 2010 22:57
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Mon, 22 March 2010 23:11
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Mon, 22 March 2010 23:44
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Tue, 23 March 2010 02:49
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Tue, 23 March 2010 03:37
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Tue, 23 March 2010 11:57
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Thu, 25 March 2010 10:35
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Fri, 26 March 2010 11:09
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Fri, 26 March 2010 12:30
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Fri, 26 March 2010 13:08
		Re: Distance - geodesic - Vincenty - very accurate By: koldo on Fri, 26 March 2010 20:07
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 27 March 2010 01:56
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 27 March 2010 05:31
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sat, 27 March 2010 08:05
		Re: Distance - geodesic - Vincenty - very accurate By: dolik.rce on Sat, 27 March 2010 10:23
		Re: Distance - geodesic - Vincenty - very accurate By: nlneilson on Sun, 28 March 2010 14:25

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