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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