[Gta04-owner] Advance OpenStreetMap surveying with GTA04?

Dr. H. Nikolaus Schaller hns at goldelico.com
Sun Mar 18 18:46:28 CET 2012


Am 18.03.2012 um 18:39 schrieb Mayeul Kauffmann:

> Thanks a lot ed!
> Having a gpx extract is great (I'm currently playing with it).
> Yes, 'hdop', 'fix' and 'sat' are the 3 main fields I need for precision.
> What is "course"? I found "Instantaneous course at the point" (in
> degrees) [1] but I do not understand.

course is the direction of movement relative to the north-direction.

> 
> Anybody could confirm that GTA04 gives this as well? (I've just asked
> the gta04-owner list too). Also: What about orientation?

Yes, the GTA04 chip provides all these NMEA records:

$GPRMC
$GPGSA
$GPGSV
$GPGGA

Nikolaus

> Thanks!
> Mayeul
> 
> 
> [1] http://www.topografix.com/gpx_manual.asp#course
> 
> 
> Le dimanche 18 mars 2012 à 17:57 +0100, Ed Kapitein a écrit :
>> On 03/18/2012 02:25 PM, Mayeul Kauffmann wrote:
>>> Le dimanche 18 mars 2012 à 14:34 +0200, Timo Juhani Lindfors a écrit :
>>> 
>>>> I used another GTA02 to make audio notes and a cheap and small digital
>>>> camera to take photos. As long as all clocks are synchronized you can
>>>> combine all the data with your netbook later.
>>> Thanks a lot Timo! I already do this with my Garmin and gpscorrelate
>>> (GNU/GPL), but without HDOP nor heading.
>>> Can you save the HDOP [1] with the GTA02?
>>> Do you have access to heading in the command line (with possibility to
>>> pipe it)?
>>> 
>>> Thanks!
>>> Mayeul
>>> 
>>> [1] http://en.wikipedia.org/wiki/Dilution_of_precision_%28GPS%29
>> Hi Mayeul,
>> 
>> If, on  a GTA02, you use a nmea log  and gpsbabel to translate it to gpx
>> format, you get:
>> 
>> <trkpt lat="51.987431167" lon="4.337932667">
>>  <ele>-16.800000</ele>
>>  <time>2012-03-17T14:01:21Z</time>
>>  <course>61.230000</course>
>>  <speed>1.071073</speed>
>>  <fix>3d</fix>
>>  <sat>8</sat>
>>  <hdop>1.580000</hdop>
>>  <vdop>2.140000</vdop>
>>  <pdop>2.660000</pdop>
>> </trkpt>
>> 
>> Would that give you all the info you need? HDOP and course  are present.
>> ( the above is just one sample of a track i walked yesterday, with a GTA02 )
>> 
> 
> 
> 
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