[OSM-newbies] Data layer doesn't look like track shape

[Anne Wilson]

On Wednesday 23 April 2008 21:27:54 Andy Robinson (blackadder) wrote:
> Anne Wilson wrote:
> >Sent: 23 April 2008 9:01 PM
> >
> >To: newbies at openstreetmap.org
> >
> >Subject: Re: [OSM-newbies] Data layer doesn't look like track shape
> >
> >On Wednesday 23 April 2008 20:10:08 Thomas Wood wrote:
> >> >  > Track log interval is set (from the main menu - press 'find' twice)
> >
> >by
> >
> >> >  > picking tracks, then set-up, then 'auto' & 'most often'.
> >> >
> >> >  I can't see that.  Set-up offers me time, display, units, interface
> >
> >and
> >
> >> >  system.  None of them refer to interval.
> >>
> >> Its under Traces and then Setup (It is confusing, I also hadn't found
> >>
> >> the option there until after owning the unit for a year!)
> >
> >By Traces, do you mean the screen that shows the shape?  The options there
> >
> >are
> >
> >orientation, autozoom, hide waypoints and show bearing line.
> >
> >
> >
> >The good news, though, is that the manual definitely says 'Update Rate:
> >
> >1/second, continuous'.
> >
> >> The USB stuff doesn't apply here, I think the confusion is that you're
> >>
> >> using a serial to usb device? You should use whatever linux /dev/ that
> >>
> >> is created when plugged in.
> >>
> >> gpsbabel expects the unit to be in Garmin data transfer mode.
> >
> >Which is where I started :-)  So, the trace produced by the gpsbabel
> >
> >command
> >
> >should download the whole log?
>
> Anne, just to be clear, according to the manual for your eTrex H
> (http://www8.garmin.com/manuals/eTrexH_OwnersManual.pdf) on page 18 it
> confirms that you can set the tracklog defaults. 

It looks as though I did find it when I first went through.  It is set to 
00:00:01.  So far, so good.

> The spec for the unit also 
> confirms you can store 10,000 trackpoints. 

I remember checking that before I bought it.

> All good. The norm for a 
> detailed track as has been said before is to set the "Record Interval" to
> "Time" and a 1 second interval. Make sure the "wrap log when full" is not
> ticked. 

Yes, that's correct as well.

> This means that when the log is full (after just under 3 hours of 
> mapping) the tracklog will turn off and you will no longer see your trace
> continuing on the trace screen. Mostly we download the tracklog after each
> trip out mapping and the clear the log back to zero before we go out
> mapping again. This keeps the tracklogs clear as to what they cover and
> reduces unnecessary duplication.
>
That is my feeling.  I had an empty log when I set out.
>
> Others hold the view that you can use the devise over a longer period of
> time by leaving the device tracklog settings at "auto". This means you can
> get a much longer use from the unit before the log is full. The alternative
> is to adjust to 2, 3 or 5 sec etc to ensure you the unit will be logging
> for the duration you are out. I would recommend you only change back to
> "auto" once you can see how the log is working and get the visual feedback
> in the OSM editors.
>
I'm happy to clear each time.
>
> Note though that converting a 1sec interval tracklog directly to an osm
> data layer doesn't really work. Too many nodes and fluctuation. Yes you can
> filter the track when its converted to GPX with gpsbabel but that's just an
> extra task you shouldn't have to do unless you want to do it that way. Much
> easier, especially for areas of the map that already have some data, to use
> the tracklog (gpx trace) as a guide to the drawing of ways over the top of
> it.
>
> Hope this helps clarify a few things.
>
Thanks.  It does.  However, it doesn't tell me what went wrong when I 
downloaded with gpsbabel and got very little data.  The commands I used were

gpsbabel -t -i garmin -f /dev/ttyUSB0 -o gpx -F track1.gpx and gpsbabel -w -i 
garmin -f /dev/ttyUSB0 -o gpx -F tracl1-waypoints.gpx
>
>
>
> In case you need to compare, this gpsbabel command takes the tracklog (-t)
> and the waypoints (-w) from the device (I too am using a serial to USB
> converter but under windoze)
>
>
>
> -w -t -i garmin -f com3: -o gpx -F "path\filename.gpx"
>
Right.  I'll try that one tomorrow, thanks.

> Hope this helps narrow down any remaining questions.
>
Thanks for your patience.

Anne
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