On Fri, 2008-02-22 at 12:23 -0800, [EMAIL PROTECTED] wrote:
> Hi- I've just joined up and I'd like to help out cleaning up the map for
> my area in Beaverton/Portland Oregon.
>
> It looks like it is completely covered already by the Tiger data. But
> I've noticed many displacement problems where
On Fri, Feb 22, 2008 at 11:05 PM, Matthew Perry <[EMAIL PROTECTED]> wrote:
> > I'm sure the correct fix is some real GPS readings, and align both the
> > photos and tiger tracks to them. But I don't have a GPS so I'm just
> > working off the Yahoo photos.
> >
>
> Don't assume that the GPS is a
Thanks everyone for the feedback.
> Don't assume that the GPS is any more accurate than either the aerial
> photos or TIGER. Often times it takes many tracks over the same area
> to get a good lock on the average centerline.
Ah, now there's something I didn't think about. Good advice. Thanks!
[EMAIL PROTECTED] wrote:
> Any advice or suggestions? Thanks.
In my area, the Yahoo! photos are wildly inaccurate (shifted east by at
least 30 meters).
TIGER data is highly variable, getting some roads perfectly correct in
some places, being completely wrong in others, missing old roads in
ot
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