[Qgis-user] points to polygons conversion

[Nicolas Cadieux]

Hi,

Unfortunately,  the $geometry field with the original polygons no longer 
exists.  Layers only have one geometry field at a time unless you 
specifically create something like a wkt of wkb field.

If it's was a regular grid, then yes, you could recreate it using 
vector/research tools/create grid.  As suggested, a Voronoi Polygons 
could work or maybe a tin mesh...  If you are on Windows 10 and have 
activated the file versioning, maybe you have an old copy of the file.

Nicolas

On 2022-03-16 12:08 p.m., chris hermansen via Qgis-user wrote:
> Francesca and list,
>
> On Wed, Mar 16, 2022, 03:06 Francesca Parente via Qgis-user 
> <qgis-user at lists.osgeo.org> wrote:
>
>     Hello group,
>
>     I'd have a question I hope it doesn't sound too nonsense to you:
>     I'm working on a points shapefile, which I know has been created
>     by centroids of polygons- but I don't have access to polygonal areas.
>     I would need to select just those in some locations and recover
>     their original area within polygonal borders.
>
>     Is there a chance I can get it done by having this shapefile of
>     centroids only?!
>
>
> Polygon centroids aren't necessarily inside polygons, so selecting 
> centroids that fall within other areas doesn't mean the original 
> polygons would also lie within those areas.
>
> Also if you are trying to determine the proportion of the original 
> polygons within the other areas (the intersections of the two sets) 
> you must have the original polygons.
>
> I doubt that answers achieved with only the centroids would provide 
> any meaningful results.
>
> Chris
>
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-- 
Nicolas Cadieux
https://gitlab.com/njacadieux
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