[gdal-dev] OGRGeometry Distance

Christopher Barker Chris.Barker at noaa.gov
Mon Sep 21 14:32:10 EDT 2009

Yilmaz Arslanoglu wrote:
> I wanted to compute the distance between two points,

you need to be clear by what you mean here: I suspect you mean:

"The shortest distance between two points following the surface of the 

In which case, what you are looking for is referred to as the geodesic 


To do this accurately (and you may not need much accuracy!) on an 
ellipsoid requires a fair bit of math. I don't know if it's built in to 
OGR or PROJ at this point, but there are a few libraries out that that 
do it, including Gerald I. Evenden's "geodesic" lib, which can be found 



Christopher Barker, Ph.D.

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chris.Barker at noaa.gov

More information about the gdal-dev mailing list