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Re: Filter out low speed
by RsH-4
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One way that will work with minimal compromise is to use
RouteConverter.exe, which is an interface to Gpsbabel.
As an example, 2 miles per hour is .894 meters per second, and the GPS
data I get is in second intervals.
So I can say 'Delete Positions' and enter 1 meter in the first option
and run RouteConverter and it will remove any reading that was reported
that was within 1 meter of the prior record. or, effectively, a bit over
that 2 miles per hour.
You need to calculate the distance in meters that you want to remove,
and then run this against the track recorded.
If you set it to 0 meters you will delete any reading where the car or
whatever was tracked was standing still, except for the first instance
at that point. If you then run it with the 1 meter per second you remove
anything moving at 3.6 kilometres per hour or less. Since I do not know
if any GPS unit records in factions of a meter, I suspect this is the
smallest interval you can actually remove... 1 second at 3.6 km per
hour.
Anyway, I do not know if this suits, but it is an approach that will
sort of work for you if the speed handled that way is okay.
RsH
----------------------------------------------------------------
On Mon, 30 Apr 2012 09:04:20 -0500, you wrote:
>On Sat, Apr 28, 2012 at 4:44 AM, Harry Matthiesen Jensen
><freebsd@...>wrote:
>
>> Can someone tell me how to filter out records with a speed lower than
>> for example 2km/h?
>>
>> I am working on a Garmin Dakota 20 "Current.gpx" file, and the filter
>> options are = -x track,pack,speed,course,split=300s,title=%Y-%m-%dT%T
>>
>> Everything working perfectly ;-)
>> ..except that I want to remove all records with speed below 2 km/h
>>
>
>I can't think of a way to do that specifically, but if most of your motion
>is faster than that (2km/h is a pretty slow walk) you can get similar
>results with the 'simplify' filter
>http://www.gpsbabel.org/htmldoc-development/filter_simplify.html That'll
>get rid of the noise at a stop light if you're a cyclist, for example.=======================================================
R. S. (Bob) Heuman <robert.heuman@...>
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RouteConverter.exe, which is an interface to Gpsbabel.
As an example, 2 miles per hour is .894 meters per second, and the GPS
data I get is in second intervals.
So I can say 'Delete Positions' and enter 1 meter in the first option
and run RouteConverter and it will remove any reading that was reported
that was within 1 meter of the prior record. or, effectively, a bit over
that 2 miles per hour.
You need to calculate the distance in meters that you want to remove,
and then run this against the track recorded.
If you set it to 0 meters you will delete any reading where the car or
whatever was tracked was standing still, except for the first instance
at that point. If you then run it with the 1 meter per second you remove
anything moving at 3.6 kilometres per hour or less. Since I do not know
if any GPS unit records in factions of a meter, I suspect this is the
smallest interval you can actually remove... 1 second at 3.6 km per
hour.
Anyway, I do not know if this suits, but it is an approach that will
sort of work for you if the speed handled that way is okay.
RsH
----------------------------------------------------------------
On Mon, 30 Apr 2012 09:04:20 -0500, you wrote:
>On Sat, Apr 28, 2012 at 4:44 AM, Harry Matthiesen Jensen
><freebsd@...>wrote:
>
>> Can someone tell me how to filter out records with a speed lower than
>> for example 2km/h?
>>
>> I am working on a Garmin Dakota 20 "Current.gpx" file, and the filter
>> options are = -x track,pack,speed,course,split=300s,title=%Y-%m-%dT%T
>>
>> Everything working perfectly ;-)
>> ..except that I want to remove all records with speed below 2 km/h
>>
>
>I can't think of a way to do that specifically, but if most of your motion
>is faster than that (2km/h is a pretty slow walk) you can get similar
>results with the 'simplify' filter
>http://www.gpsbabel.org/htmldoc-development/filter_simplify.html That'll
>get rid of the noise at a stop light if you're a cyclist, for example.
R. S. (Bob) Heuman <robert.heuman@...>
Copyright retained. My opinions - no one else's...
If this is illegal where you are, do not read it!
Candian Anti-Spam Legislation applies.
Retention of this message in violation of Canadian
Privacy Laws will be prosecuted.
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Gpsbabel-misc mailing list http://www.gpsbabel.org
Gpsbabel-misc@...
To unsubscribe, change list options, or see archives, visit:
https://lists.sourceforge.net/lists/listinfo/gpsbabel-misc
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