[Qgis-user] How I solved my "Polygon" to "Mutipoligons" problem

[Richard McDonnell]

Andrea,
I believe what Riccardo is getting at is that while an "ESRI Shapefile" (*.shp) always will have MultiPolygon as its Geometry Type, the "Polygons" within the shapefile are unique individual geometries.
We have this requirement in our own organisation, in reaction to Shapefiles, there can be no Multipart Geometries. To explain a little further, we don’t allow Multiple Geometries linked by a single row in a Table, each geometry has its own row.
I hope that clarifies things.
Kind Regards,

Richard.





——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://gov.ie/opw

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——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://www.opw.ie

——
To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie

Email Disclaimer: https://www.opw.ie/en/disclaimer/
> -----Original Message-----
> From: QGIS-User <qgis-user-bounces at lists.osgeo.org> On Behalf Of Andrea
> Giudiceandrea via QGIS-User
> Sent: 10 May 2023 14:23
> To: qgis-user at lists.osgeo.org
> Cc: Andrea Giudiceandrea <andreaerdna at libero.it>
> Subject: Re: [Qgis-user] How I solved my "Polygon" to "Mutipoligons"
> problem
>
> > Riccardo riccardopani at hotmail.com
> > Wed May 10 01:10:00 PDT 2023
>
> > The problem was that the shape file I created, had the “multipoligon”
> property while in those of the standard delivery there was the simple
> “polygon” property .
> > Based on what you told me, this property cannot be changed in a shape file
> already created.
>
> Hi Riccardo,
> this make no sense to me.
> If with "shape file" you actually mean "ESRI Shapefile" (*.shp), then, as
> previously written, an ESRI Shapefile polygon layer is always a MultiPolygon
> layer which can always stores multi-part geometries. It is not possible to
> create an ESRI Shapefile polygon layer that can store only single-part
> geometries.
>
> Maybe with "shape file" do you mean a vector layer of a format other then
> "ESRI Shapefile"?
>
> Best regards.
>
> Andrea
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