[Talk-ca] Ground Truthing protocol? --- Re: Accuracy of CanVec vs Yahoo?

[Regie Alam]

Hello,

   My name is Regie Alam, from Ottawa. This is my first post on the list 
although I've been receiving the messages for quite some time now.

   I am just wondering if there is an accepted protocol for ground truthing the 
data (Canvec, etc.)? I would find it interesting doing some ground truthing.

Regie

 



________________________________
From: "Bégin, Daniel" <Daniel.Begin at RNCan-NRCan.gc.ca>
To: G. Michael Carter <mikey at carterfamily.ca>; talk-ca at openstreetmap.org
Sent: Tue, July 6, 2010 1:50:53 PM
Subject: Re: [Talk-ca] Accuracy of CanVec vs Yahoo?


Bonjour Michael
 
About accuracy: Canvec should usually be better than 10m (90%) for road network 
and 30m for other features.  We know that Yahoo imagery often have offsets.  
However, you better have plenty of gps tracks to take a decision.
 
By the way, there is no park boundaries in Canvec product -for the moment.
 
About contents: Yahoo imagery is usually more up-to-date than Canvec - except 
for road network and for hydrography in some provinces.
 
I agree with Richard, the details always matter.  You may sometime have to 
choose between accuracy and completeness...
 
Daniel


________________________________
From: talk-ca-bounces at openstreetmap.org 
[mailto:talk-ca-bounces at openstreetmap.org] On Behalf Of G. Michael Carter
Sent: 6 juillet 2010 12:12
To: talk-ca at openstreetmap.org
Subject: [Talk-ca] Accuracy of CanVec vs Yahoo?

When importing the data do we favour yahoo existing data in OSM (which is 
obviously traced from satellite imagery)  or CanVec?   I'm assuming CanVec for 
parks would be based on official park boundaries rather than yahoo, line of site 
on open spaces.   So parks would be better coming from CanVec.  But what about 
buildings?

Mikey



-- 
G. Michael Carter
Contact: H: 1-519-940-8935 | W: 1-905-267-8494 | M: 1-519-215-1869 | F: 
1-519-941-0009 

Google Talk: xmpp:mikeycarter1974 at gmail.com

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