[postgis-users] distance between two POINTM

[Brent Wood]

--- Paul Ramsey <pramsey at refractions.net> wrote:

> Excellent sleuthing Michael.  If you want to get consistent results  
> between a GPS track and a point-to-point measurement, M. Welter,  
> attach your GPS unit to a crow :)

Anecdote:

Getting a taxi from an airport to a city, where the road ran around a harbour
coastline. It used to cost about 80c more going to town, because it was about
300m further. 

Which distance would show up by measuring a road centerline?
Which way were you going when you measured the distance using GPS?

Cheers,

  Brent Wood