[OSM-talk] GeoEye Haiti imagery Ok'd

[Andy Allan]

On Fri, Jan 15, 2010 at 4:11 PM, Simone Cortesi <simone at cortesi.com> wrote:
> On Fri, Jan 15, 2010 at 17:07, John F. Eldredge <john at jfeldredge.com> wrote:
>> You may be seeing the earthquake damage, since it damaged or collapsed thousands of buildings, and may well have caused some coastal changes via landslides, the raising or lowering of land, etc.
>
> so, the image is correctly placed and I can safely move the coast
> around to match it?

The imagery isn't rectified using ground control points obtained via
GPS units, if that's what you're asking, so no, it's not going to be
100% accurate. I'm not certain what was used to rectify it, but I
suspect either Yahoo imagery or OSM data itself.

If you find an area where all the OSM data is off by a fixed amount,
then don't worry about moving the data, move the imagery instead. And
don't worry about it overly much, since anyone on the ground with a
GPS unit will be able to cope with a 5-10m displacement.

Cheers,
Andy