Hi Nicolas, Il giorno dom 1 gen 2023 alle ore 04:53 Nicolas Cadieux < njacadieux.git...@gmail.com> ha scritto:
> > > Try decimal with commas. Check your local system settings. Could this be > a wrong CRS problem? Try zoom to layer extent to see if they pop up in the > wrong place. Share a few examples so we can check. Try exporting the > geometries to Wkt in a new field to see what happens…. > Thank you for your suggestions, particularly the "geom_to_WKT", it let me discover problem. IMHO this is a bug in "geometry by expression" algorithm. By my exoeriences, this algorithm works _only_ if source layer has at almost one feature. If so, you can add new feature by this expression: make_point(to_real(@Long),to_real(lat)) where @Long and @Lat are two project variables. Everything works as expected. Otherwise, e.g. when the source layer has no feature (empty layer), the geometry by expression fails and return <null> geometry, even if the preview in expression generator is correct. In my test, i was usual to truncate the source layer before generate new geometry. This caused the fail of geometry by expression algorithm. Instead, if i don't truncate source layer (and it has at almost one geometry before running the model), then the algorithm works. This is a bit confusing, because in the "geometry by expression" documentation there is no reference to this condition. Could this be a bug? Is it possible to add new features to a empty layer with geometry by expression? Again, thank you to everyone and have a nice year! Francesco
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