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
<[email protected]> 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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