It's pretty simple and fun to compute these for your own use cases. Openstreetmap data is really useful here. One implementation: http://notes.secretsauce.net/

It's pretty simple and fun to compute these for your own use cases. Openstreetmap data is really useful here. One implementation: http://notes.secretsauce.net/notes/2015/05/06_poles-of-inaccessibility-in-the-san-gabriel-mountains.html http://notes.secretsauce.net/notes/2015/05/06_poles-of-inacc...