On Tue, 16 Sept 2025 at 10:37, Nyall Dawson <nyall.daw...@gmail.com> wrote:
> Hi list, > > While tracking down the failures from > https://github.com/qgis/QGIS/pull/63180, it's revealed that using QGIS > with libspatialindex >= 2.0 gives completely misleading results for nearest > neighbour geometry searches. > > The root cause is an optimisation from the upstream library ( > https://github.com/libspatialindex/libspatialindex/commit/6fe9ff769243579ed74f7f27409dd1dda6591634) > that breaks how downstream clients could previously implement custom > nearest neighbour comparators. From my research I don't think this is > fixable in QGIS, and will need an upstream fix. > Sorry -- to clarify, that should have been >= 2.1 . 2.0 did not include the offending commit. Nyall
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