On Fri, Nov 23, 2012 at 11:28 AM, Pierre Béland wrote:
> And it is suggested to deactivate the option Lock on road.
If you leave the "snap to road" function enabled in the GPS, you can
conceivably be violating copyright law. If the map database in the GPS
is protected under copyright, and you ar
t;Envoyé le : Mardi 20 novembre 2012 21h11
>Objet : Re: [Talk-ca] GPS inaccuracy
>
>I redid some of my survey yesterday following Pierre and Bernie's suggestions.
>The results are more reasonable. After averaging, some of my points were
>showing error of +/- 2 m or less.
>
>
:42
> To: talk-ca@openstreetmap.org
> Subject: Re: [Talk-ca] GPS inaccuracy
>
> I redid some of my survey yesterday following Pierre and Bernie's
> suggestions. The results are more reasonable. After averaging, some of
> my points were showing error of +/- 2 m or less.
>
ssage-
From: Tom Taylor [mailto:tom.taylor.s...@gmail.com]
Sent: November-20-12 22:42
To: talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] GPS inaccuracy
I redid some of my survey yesterday following Pierre and Bernie's
suggestions. The results are more reasonable. After averaging, som
I redid some of my survey yesterday following Pierre and Bernie's
suggestions. The results are more reasonable. After averaging, some of
my points were showing error of +/- 2 m or less.
In working on the new trace, I learned to shift the Bing images as
necessary. Then I found that some buildin
" ;
>"talk-ca@openstreetmap.org"
>Envoyé le : Lundi 19 novembre 2012 10h29
>Objet : Re: [Talk-ca] GPS inaccuracy
>
>I will do a resurvey in the way you suggest. It was really disappointing to
>find I couldn't trust my GPS at all (well, I did some mental a
On Sun, Nov 18, 2012 at 10:43 AM, Tom Taylor wrote:
> I had a frustrating experience last night, sorting out an area in my
> neighbourhood. I laid down a GPS track totalling some 4 km. The whole track
> was about 10 meters to the west of the Bing and Canvec data already in
> place. North-south acc
, Bernie (SNB); talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] GPS inaccuracy
Other things you could do: check if the Canvec data has been moved after being
imported. As I've said, Bing imagery can be improperly aligned, but not
everybody is aware of that. So it's possible that a we
Tom,
Your results are not unusual. A newer handheld navigation-grade
receiver has an accuracy of 3 to 5 meters at best (older ones without
WAAS have an accuracy of 10 m). Slowly changing (over hours)
atmospheric effects can introduce an systematic offset into your
coordinates of 3 to 5 or ev
Other things you could do: check if the Canvec data has been moved
after being imported. As I've said, Bing imagery can be improperly
aligned, but not everybody is aware of that. So it's possible that a
well-meaning mapper has moved the Canvec data to match the imagery.
Did you check your GPS devic
I will do a resurvey in the way you suggest. It was really disappointing
to find I couldn't trust my GPS at all (well, I did some mental
adjustment of waypoints to place building entrances), and being off by a
constant amount for 4 km certainly makes one suspicious.
A bit to the north, my GPS
Who said Bing and/or Canvec are accurate?
On 18 November 2012 19:31, Tom Taylor wrote:
> Mostly the buildings were two stories only. A high-voltage transmission
> line runs behind them, the width of the buildings and more away, but maybe
> it had some effect.
>
>
> On 18/11/2012 11:23 AM, Pierr
Mostly the buildings were two stories only. A high-voltage transmission
line runs behind them, the width of the buildings and more away, but
maybe it had some effect.
On 18/11/2012 11:23 AM, Pierre Béland wrote:
Tom
You can try to repeat the experience with this same GPS and compare your
res
'Talk-CA OpenStreetMap'
>Envoyé le : Dimanche 18 novembre 2012 10h43
>Objet : [Talk-ca] GPS inaccuracy
>
>I had a frustrating experience last night, sorting out an area in my
>neighbourhood. I laid down a GPS track totalling some 4 km. The whole track
>was about 10 mete
I had a frustrating experience last night, sorting out an area in my
neighbourhood. I laid down a GPS track totalling some 4 km. The whole
track was about 10 meters to the west of the Bing and Canvec data
already in place. North-south accuracy varied, but wasn't anywhere near
so bad.
It doesn
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