[Talk-ca] aerial imagery for missing roads

[Stewart C. Russell]

Hi Martijn,

> I am wondering if you know of any more recent aerial imagery that may be
> available? Or other suggestions to fill in these missing roads? (We have
> found many, many cases in Canada alone)

We don't have a national mapping agency in Canada that gives everything
away for free. Aerial imagery is typically carried out every couple of
years by the provinces, but in agricultural areas only. This is not free
and tends to cost anything from $10-150 / sq km just to see. Coverage is
spotty, and depends on the province's priorities.

Within 10 miles of the Great Lakes (so, not in your example) we used to
have access to wonderful USGS imagery. We can no longer see it in
Canada, although I suspect the images are still collected and may be
geofenced. Can't have free data getting in the way of Provincial cost
recovery, can we?

cheers,
 Stewart