[gdal-dev] Buffer in geodetic space

[Schumacher, Mia]

Hi Javier,

there is a QGIS plugin called 'Beeline' that measures great circle 
distances: https://plugins.qgis.org/plugins/Beeline/

Hope that helps?

Cheers,
Mia

On 20.06.25 12:06, Javier Jimenez Shaw via gdal-dev wrote:
> Hi
>
> Yesterday I read an article in a newspaper with an image showing 
> distances from a country that was not considering that the Earth is 
> spheric. It is not the first time; it will not be the last one. As we 
> all (should) know, measuring large distances (thousands of kilometers) 
> in projected coordinates is wrong.
>
> Is there any way to do it properly in GDAL or QGIS? What I mean is 
> that the distance (in meters) for a buffer (or parallel line) is 
> measured along greatest circles perpendicular to the source geometry.
>
> If not, should we implement it somewhere? (GDAL, QGIS, somewhere else)
> I guess that we need PROJ for that algorithm to compute the distance 
> along a great circle.
>
> Thanks
> Javier
>
> PS trying in QGIS, I see it uses ST_Buffer from an sqlite query. But 
> it is not what I am talking about. That is the "wrong" solution for 
> large distances.
>
>
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