[Openstreetmap] Vehicle hardware tracking setup--city centers

wabanstar waban_star at yahoo.com
Tue Jan 31 15:52:28 GMT 2006


The setup I've been testing works very well and collects tracks and points, accuracy is 6-11 meters which is very good for in car, Trimble will give you cm accuracy which is not needed for street mapping and their unit are in the thousands of $. I have an old Garmin GPS2+ with a data cable port. These types of units are prefered for data collection by some US state agencies such as Cali. and Mich. due to ruggedness, accuracy, dataport. It contains a 12 channel sat. reciever. (tracks up to 12 satellites).
  I bought a data/power cable that plugs into the cigarette lighter an power both the Garmin and a Palm Pilot 500 series I got on Ebay for a good price. A plastic dash mount made for the Garmin keeps it in place, Velcro for the Palm on dash. I bought a new rooftop magnetic antenna that hooks by cable to the Garmins antenna port ( you remove the one that comes with, a simple twist connection), it was listed on line for 120$ but got on Ebay for $20. I use Cetus GPS palm free/shareware to record tracks and points, it is well written and you can store a lot of data on the palm with it, when you sync to desktop you go to palm/user/archive and convert the DB using GPS TrackData--a companion APP found at the Cetus site. 
  For City centers all I can contribute is that overhead orthorectified quarter quadrangles would be the best solution if you have access to them. If not the above setup was working well in a six story rock canyon this week. You could also capture known feature that have a good sat fix like intersections in parks and at the edge of the poor reception area and then use city engineering plans or ordance maps to calculate true 
  distances along known orientations and aligned with knowpoints, digitize from the drawings and rubbesheet or stretch to fit known accurate intersection node data.
  Waban ,* ) 
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Today's Topics:

1. Re: Zooming in editor moves the focus (SteveC)
2. Re: Inner city accuracy (Lars Aronsson)
3. Re: Inner city accuracy (Christian van den Bosch)
4. Re: Inner city accuracy (Thomas Walraet)


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Message: 1
Date: Mon, 30 Jan 2006 12:26:13 +0000
From: SteveC 
Subject: Re: [Openstreetmap] Zooming in editor moves the focus
To: Andy Robinson 
Cc: openstreetmap at vr.ucl.ac.uk
Message-ID: <20060130122613.GB22743 at asklater.com>
Content-Type: text/plain; charset=us-ascii

Yes upon switchover I had to also install libxml which left some time
where it was returning 500's.

Sorry.

* @ 29/01/06 11:49:12 PM Andy_J_Robinson at blueyonder.co.uk wrote:
> Has the libxml speedup implementation had an impact on the API call? I'm
> getting 500 errors with JOSM tonight when trying to fetch the nodes and
> segments. GPX points arrived ok.
> 
> Andy
> 
> Andy Robinson
> Andy_J_Robinson at blueyonder.co.uk 
> 
> >-----Original Message-----
> >From: openstreetmap-bounces at vr.ucl.ac.uk [mailto:openstreetmap-
> >bounces at vr.ucl.ac.uk] On Behalf Of SteveC
> >Sent: 29 January 2006 22:07
> >To: Erik Johansson
> >Cc: openstreetmap at vr.ucl.ac.uk
> >Subject: Re: [Openstreetmap] Zooming in editor moves the focus
> >
> >* @ 29/01/06 02:50:27 PM erjohan at gmail.com wrote:
> >> On 1/28/06, Oliver White wrote:
> >> > In the java-applet editor, when using [ and ] to zoom the map, it seems
> >to
> >> > return to the "start" of your current tracklog (i.e. the location it
> >first
> >> > showed when you selected a GPS trace and clicked "edit")
> >> >
> >> > Is this intentional? It takes quite a while to get back to the
> >location of
> >> > interest, and for those of us with an unreliable or slow internet
> >connection,
> >> > the applet often stops responding in the meantime.
> >>
> >> Yes that feels like a bug, very annoying to. I filed a report at:
> >>
> >> http://www.openstreetmap.org/trac/ticket/132
> >
> >fixed.
> >
> >also deployed the libxml speedup.
> >
> >have fun,
> >
> >SteveC steve at asklater.com http://www.asklater.com/steve/
> >
> >_______________________________________________
> >Openstreetmap mailing list
> >Openstreetmap at vr.ucl.ac.uk
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> 
> 
> 
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have fun,

SteveC steve at asklater.com http://www.asklater.com/steve/



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Message: 2
Date: Mon, 30 Jan 2006 23:03:48 +0100 (CET)
From: Lars Aronsson 
Subject: Re: [Openstreetmap] Inner city accuracy
To: openstreetmap at vr.ucl.ac.uk
Message-ID: 

Content-Type: TEXT/PLAIN; charset=utf-8

Thomas Walraet wrote:

> I just bought a Garmin Nüvi for my dad today (don't tell him, it's his
> birthday tomorrow!)

Can this (very nice looking) unit (or indeed any model intended 
for car mounting) output tracklog files, or NMEA raw data? I 
found neither when I browsed through the user's manual online.

When I ask car radio dealers (who sell GPS receivers) about 
tracklog dumps they look like nobody ever asked that question. 
That surprises me, because I would imagine that professional 
drivers would be interested in getting an exact log of their daily 
driving.


-- 
Lars Aronsson (lars at aronsson.se)
Aronsson Datateknik - http://aronsson.se



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Message: 3
Date: Tue, 31 Jan 2006 10:03:21 +0000
From: Christian van den Bosch 
Subject: Re: [Openstreetmap] Inner city accuracy
To: openstreetmap at vr.ucl.ac.uk
Message-ID: <43DF35E9.6070509 at cjb.ie>
Content-Type: text/plain; charset=UTF-8; format=flowed

Lars Aronsson wrote:

> Can this (very nice looking) unit (or indeed any model intended 
> for car mounting) output tracklog files, or NMEA raw data? I 
> found neither when I browsed through the user's manual online.

I gather the Sirf Star III chipset used will talk NMEA as well as its 
own proprietary protocol; I don't know whether it supports any form of 
logging itself, or if you'd need to get a PDA doing it in real time via 
bluetooth, USB, RS232 cable, whatever.

I would presume - naively perhaps - that any GPS unit with some form of 
serial connection will talk to a host in a useful way.

I'm trying to find out the same about the Holux 236, which is looking 
very cheap on eBay lately, but will be useless to me unless it does its 
own logging (I am _not_ mounting a PDA beside it on my handlebars...!)

Cheers,

Christian / cjb

http://www.cjb.ie/



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Message: 4
Date: Tue, 31 Jan 2006 11:14:32 +0100
From: Thomas Walraet 
Subject: Re: [Openstreetmap] Inner city accuracy
To: openstreetmap at vr.ucl.ac.uk
Message-ID: <43DF3888.9080609 at walraet.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Christian van den Bosch a écrit :
> Lars Aronsson wrote:
> 
>> Can this (very nice looking) unit (or indeed any model intended for 
>> car mounting) output tracklog files, or NMEA raw data? I found 
>> neither when I browsed through the user's manual online.
> 
> I would presume - naively perhaps - that any GPS unit with some form of 
> serial connection will talk to a host in a useful way.

The Nüvi is shipped with an USB cable. But when connected to a computer, 
it is just detected as a hard drive. (two drives in fact : SD card and 
internal memory)


There's no option on the unit config screens for tracklog...



------------------------------

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