[Talk-ca] Modifying GeoBase Ways.

[James Ewen]

On Mon, Nov 16, 2009 at 6:48 PM, john whelan <jwhelan0112 at gmail.com> wrote:

> Multiple approximations can often be very accurate when averaged.

I agree... put a commercial grade GPS on a spot, and record the
results over a long enough period, you can come up with a close
approximation of where they device was located.

However, driving up and down a road 5 or 6 times is not going to give
you a superior representation of where the real road is located. You
are not going to get the exact same locations recorded on each
subsequent trip down the road, so each location has to be looked at as
a point of dubious quality.

The OSM project is always going to be of "dubious quality" because of
the equipment used to capture the data, and the abilities of the
person doing the data entry.

Those needing super accurate data need to be looking elsewhere. This
project will never be able to provide sub-metre accuracy.

>From my observations, the GPS accuracy that I regularly observe puts
me within 5 to 15 feet or 2 to 5 meters of reality. This would be in
line with the GeoBase stated accuracy factor as well.

James
VE6SRV