[OSM-talk] New "Highways" view in OSM Inspector

[Frederik Ramm]

Hi,

Frederik Ramm wrote:
> Because of that, it is a very pragmatic choice to say 
> "let's not have distances of more than a few kilometres between nodes" 
> because that will then reduce the error between the three different 
> types of "straight line" discussed above to something very small[*].

I had intended to add:

[*] I haven't computed this myself due to lack of mathematical genius 
but if someone feels so inclined, I would be interested to know the 
answer to the following question: "Given that OSM accuracy is very 
seldom better than 1 metre, how far apart would two nodes have to be so 
that the difference between "straight line on mercator", "straight line 
on EPSG:4326", and "great circle" exceeds that accuracy? - The answer 
will probably be latitude dependent, so it would be good to know the 
value for some example countries.

Bye
Frederik