[Talk-ca] Intro and a question

[Connors, Bernie (SNB)]

>  Also too it is OK to use Bing data to create a way if used in 
>  conjunction with local knowledge and/or GPS tracks?

Bing has granted OSM permission to use the Bing imagery for digitizing OSM data.  There are no restrictions that I am aware of.

Bernie.
--
Bernie Connors, P.Eng
Service New Brunswick
(506) 444-2077
45°56'25.21"N, 66°38'53.65"W
www.snb.ca/geonb/

-----Original Message-----
From: Steve Roy [mailto:steve at ssni.ca] 
Sent: Friday, 2012-03-02 21:15
To: "Bégin, Daniel"
Cc: Connors, Bernie (SNB); Talk-CA OpenStreetMap
Subject: Re: [Talk-ca] Intro and a question

Thanks for the feedback.  So it's then safe to assume that in most cases 
my GPS track will be more accurate than the  NRCan highway=footway and 
really it's up to the person adding data/ways on the map as to whether 
they should keep the existing NRCan way or modify or add to it.  A lot 
of the area has been logged due to pine beetle kill of the trees so GPS 
data is better than when it was forested.

Also too it is OK to use Bing data to create a way if used in 
conjunction with local knowledge and/or GPS tracks?

In the area there is the Gus Johnson trail which circles the lake and is 
for foot and bicycle traffic only (no motorized vehicles of any kind - 
also a X-country ski trail system which also allows hiking and biking in 
summer along with numerous forestry and 4x4 roads and dozens of small 
foot tracks connecting them all.  I'm going to see if some of the other 
local Geocachers can help with GPS tracks.

Cheers
Steve

On 3/1/2012 11:19 AM, Bégin, Daniel wrote:
> Bonjour Steve and Bernie,
>
> Agreed with Bernie, I'll go a bit deeper in what has already been said...
>
> NRCan highway=(vehicle) were obtained using GPS (better than 5 meters 90%)
> NRCan highway=footway have been obtained from aerial photography (30 meters 90%) and are usually more that 30 years old.
>
> Standard GPS device will usually give an accuracy better than 10 meter 90% in good conditions (no obstacles - mountains, buildings, trees)
>
> It would not be unusual to get a GPS track off by quite a few meters in forest/mountain area. Imagery can also be affected by distortion in such areas - if no appropriate corrections were done.
>
> However, if you have many GPS tracks that seem glued together, take yours !-)
>
> Best regards,
> Daniel
>
>
> -----Original Message-----
> From: Connors, Bernie (SNB) [mailto:Bernie.Connors at snb.ca]
> Sent: March 1, 2012 14:04
> To: 'Steve Roy'; Talk-CA OpenStreetMap
> Subject: Re: [Talk-ca] Intro and a question
>
> Steve,
>
> 	I have had a look at your GPS trace and the OSM data in the Lac Le Jeune area with the Potlatch 2 editor.  It appears to me that your GPS trace matches quite well with the Bing imagery in the area.  Since you are familiar with the area you could accomplish more by simply digitizing from the Bing imagery and supplementing with GPS traces when necessary.  I would trust your GPS trace to be more accurate than the CanVec data in the area.  It is really up to you to decide if you want to reposition existing data or delete it and digitize new features.  I find that sometimes the CanVec data has many nodes and it is time consuming to reposition each node.  The CanVec data is using the tag "highway = footway" where it appears that it is suitable for vehicles.  I suggest "highway = track" is more appropriate.  It looks like another user has already digitized some "highway = track" in this area and created some duplicate ways such as this one:
>
> http://www.openstreetmap.org/user/SRW/traces/1187039
>
> 	With your local knowledge it should be easy to identify these duplicate ways and remove the less accurate data.
>
> Bernie.
> --
> Bernie Connors
> New Maryland, NB
> bernie.connors at unb.ca
>
> -----Original Message-----
> From: Steve Roy [mailto:steve at ssni.ca]
> Sent: Thursday, 2012-03-01 14:14
> To: Talk-CA OpenStreetMap
> Subject: [Talk-ca] Intro and a question
>
>
> Hi
>
> I thought I'd introduce myself and also ask a couple of questions. I
> live in New Westminster BC and spend a lot of time in the Lac Le Jeune
> area as we have a family cabin there.
>
> I want to start adding data in the Lac Le Jeune area that I collect with
> my GPS when out hiking, biking, 4x4ing, sledding etc. There are numerous
> trails and roads in the area that aren't on OSM.
>
> I have managed to add a couple of forestry roads so far but want to know
> the best way to combine my edits with current roads and tracks on the
> map.There are parts of existing roads and tracks shown on the map and
> they are from NRCan-CanVec-7.0.Some match with my GPS track, others are
> off by quite a few meters.
>
> Should I:
>
> -Leave the existing NRCandata as is and add my data (i.e. my track lays
> over the NRCan track)
>
> -Combine the two and move the nodes of the NRCan?
>
> -Or leave the existing NRCan track as-is and join bits of my track to
> nodes on the NRCan data?
>
> This is the area where I want to add tracks and trails:
>
> http://www.openstreetmap.org/?lat=50.4798&lon=-120.4541&zoom=14&layers=M
> <http://www.openstreetmap.org/?lat=50.4798&lon=-120.4541&zoom=14&layers=M>
>
> This is a GPS trace I have uploaded:
>
> www.openstreetmap.org/user/SRW/traces/1187039
> <http://www.openstreetmap.org/user/SRW/traces/1187039>
>
> Thanks
>
> Steve
>
>



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