[Talk-ca] CanVec misalignment? Ottawa end of Portage Bridge

[William Rieck]

There is no gospel, although surveys and GPS traces may be close, but
certainly not Bing and CanVec imports.

The map should represent what you see on the ground, so make whatever
adjustments are needed, using deduction from your primary source (a
survey), that aligns with traces (absolute position) and any other sources
(Bing, Canvec) if they are helpful.


On Tue, Dec 18, 2012 at 11:04 AM, Tom Taylor <tom.taylor.stds at gmail.com>wrote:

> I've been continuing to work on validation errors in the Ottawa area. One
> complaint was of buildings projecting into the Ottawa River on the west
> side of the Portage Bridge, by the dam between the Ottawa side of the river
> and Victoria Island. When I look, the buildings (source CanVec 6.0) are way
> out of line (up to 7 m) with the Bing imagery, but lots of GPS traces show
> that Bing has put the Portage Bridge in the right place.
>
> Do we take CanVec as gospel in this case and shift the river boundary, or
> should I just tiptoe away and leave it alone?
>
> Tom Taylor
>
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