[Talk-ca] Geobase vs. Yahoo...

[Sam Vekemans]

Hi,

On Fri, Jun 4, 2010 at 6:23 AM, Tyler Gunn <tyler at egunn.com> wrote:
>
> I was looking around winnipeg's downtown
> (http://www.openstreetmap.org/?lat=49.89162&lon=-97.14226&zoom=16&layers=B000FTF)
> and noticed that the street grids don't align all too well to what is in
> Geobase.  It looks like the original outline of the street grid was done as
> a tracing from Yahoo.  Looking at the yahoo imagery I've noticed it is
> quite difficult to see where some of the roads actually are since the
> perspective of the imagery is such that the roads are covered.  As a result
> I'm noticing some areas where buildings are overlapping the road, or where
> the roads aren't straight despite me knowing they're straight.
>
> So I'm curious if I should consider the GeoBase data more correct and
> attempt to clean up accordingly?  There's not a lot of good GPS trace data
> in the area so perhaps I just need to drive out myself to get some
> readings.

I think you answered that yourself :)

Once a few road have gps tracks, its easy to see which is off.
And Once for features are added, like sidewalks and post boxes by
others, over time the map quality will get better.
Yahoo imagery is also old, so it's hard to say which is better.

Cheers,
Sam

>
> Thanks,
> Tyler
>
>
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