[gdal-dev] OGRGeometry Distance

Mateusz Loskot mateusz at loskot.net
Wed Sep 23 04:55:01 EDT 2009

Christopher Barker wrote:
> 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 
> earth"
> In which case, what you are looking for is referred to as the geodesic 
> distance:
> http://www.vterrain.org/Misc/distance.html
> 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 
> here:
> http://home.comcast.net/~gevenden56/geodesy/project/

Here is another interesting article on that subject:


Best regards,
Mateusz Loskot, http://mateusz.loskot.net

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