[OSM-talk] Imagery parallax error in high altitude areas

Russ Nelson nelson at crynwr.com
Tue Apr 10 04:01:52 BST 2012


Nathan Edgars II writes:
 > It's not as bad as it seems. Imagery is adjusted using an elevation 
 > dataset. Since this data doesn't (and shouldn't) include buildings and 
 > bridges, these appear distorted. You'll also see problems where recent 
 > heavy construction has caused changes in topography.

Or where the elevation dataset doesn't include a deep canyon, which
causes a straight bridge to appear curved. If it's a railroad, you can
be pretty sure it isn't. If it's a road bridge, you have to rely on
what you saw when you were there.

-- 
--my blog is at    http://blog.russnelson.com
Crynwr supports open source software
521 Pleasant Valley Rd. | +1 315-600-8815
Potsdam, NY 13676-3213  |     Sheepdog       



More information about the talk mailing list