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Re: intersection of two tracks(lat,lon) [message #75232 is a reply to message #75069]

Mon, 21 February 2011 06:05

guillermo.castilla.ca is currently offline

guillermo.castilla.ca
Messages: 27
Registered: September 2008

Junior Member

> Am 17.02.2011 09:22, schrieb Kai Muehlbauer:
>
> Actually I do (as Guillermo suggested) check the heights of the two
> tracks at intersection point. This is sufficiently fast and suits fine.
Then why make it complicated by going for the brute force solution??
The latter would only make sense if your tracks consisted of GPS
waypoints measured say every millisecond. Otherwise the fact that two
waypoints from different tracks are close (i.e., a local minimum in
the distance array) is no guarantee that the tracks actually intersect
(they could run in parallel and be a narrowing in that section).
Conversely, if the tracks are measured at different time lags, or if
the objects have very different speed, an intersection does not need
to translate into a local minimum in the distance array (the waypoints
could be far away from the intersection). So the fact that you are
still considering the other solution makes me curious, what in earth
are you tracking??

Cheers

Guillermo

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[Message index]

		intersection of two tracks(lat,lon) By: Kai Muehlbauer on Wed, 16 February 2011 00:59
		Re: intersection of two tracks(lat,lon) By: Kenneth P. Bowman on Thu, 17 February 2011 07:11
		Re: intersection of two tracks(lat,lon) By: guillermo.castilla.ca on Thu, 17 February 2011 07:02
		Re: intersection of two tracks(lat,lon) By: Kai Muehlbauer on Thu, 17 February 2011 00:22
		Re: intersection of two tracks(lat,lon) By: Kai Muehlbauer on Sun, 20 February 2011 23:59
		Re: intersection of two tracks(lat,lon) By: kisCA on Wed, 16 February 2011 12:39
		Re: intersection of two tracks(lat,lon) By: Kai Muehlbauer on Mon, 21 February 2011 22:51
		Re: intersection of two tracks(lat,lon) By: guillermo.castilla.ca on Mon, 21 February 2011 06:05

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