OpenStreetMap
I'm mapping the town of Williams Lake, British Columbia, Canada. After uploading my tracks and adding my roads I like to see how it looks compared to some of the online commercial options. It's always satisfying to see errors in commercial road data when mine is right :) I've already found at least 3 gross errors that my map _won't_ have (especially roads going over water or through buildings). Here's one road I won't want to take (see imagery):
http://maps.google.com/?ie=UTF8&ll=52.119953,-122.121813&spn=0.003538,0.009999&t=h&z=17
Discussion
Commentaire de spatialguru le 2 avril 2008 à 5 h 23
Arg.. here's a better link:
http://tinyurl.com/2jlh4w
Commentaire de Mourner le 2 avril 2008 à 12 h 51
Great work :) Very accurately done.
Commentaire de Deelkar le 3 avril 2008 à 13 h 13
This comparison shows that some google tiles seem to lack that error
http://geo.topf.org/comparison/index.html?mt0=tah&mt1=googlehybrid&lon=-122.1243611&lat=52.120836&z=15
Commentaire de spatialguru le 3 avril 2008 à 16 h 30
Thanks guys. Thanks also for the comparison check - I find some strange behaviour about which scales and tiles have the error. I'm going to probably finish up that area today just to make mine more complete around that problem :)