Hi, See this example on how I do that in Julia. At the bottom it’s GDAL functions that are being used.
https://www.generic-mapping-tools.org/GMTjl_doc/examples/misc/buffer/#example_2628794262856115982 Joaquim From: gdal-dev <gdal-dev-boun...@lists.osgeo.org> On Behalf Of Schumacher, Mia via gdal-dev Sent: Friday, June 20, 2025 11:31 AM To: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] Buffer in geodetic space 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. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org> https://lists.osgeo.org/mailman/listinfo/gdal-dev
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