Replacing existing geometry in QGIS 3

Question

In QGIS 3 does anyone know how to copy the geometry of one feature and paste it into another selected feature to just override the geometry?

Within PostGIS I did this with an update, but I'm looking for a visual way in QGIS. Simply copy and paste.

The only solution I found, is to insert the copy of a feature as a new entry, edit the missing attributes and delete the old one.

Answer 1

There is the Geometry Paster Plugin

Turns out we had a task for this too, so here we go:

• https://www.youtube.com/watch?v=NMs5hDf5ndE (EN)
• https://www.youtube.com/watch?v=Mw9y-_HBmko (RU)

Answer 2

not so visual, but it works

1. Select feature, copy it
2. Paste in a text doc, remove all except WKT geom
3. Add stuff around your WKT: geom_from_wkt('YOUR WKT GEOM HERE')
4. Select feature to replace geometry
5. Use resulting line in Field calculator to replace geometry with a new one (text from 3)

Answer 3

You can select the source feature and copy ("Edit > Copy Features" or "CTRL + C"), then, in edit mode with the destination feature selected, use the "Delete Part" tool and click on the geometry you want to replace. After that, with the feature still selected (you can have the attribute table open to be sure because your feature will no longer have a geometry), use the "Add Part" tool and paste the copied geometry.

You can use the method to replace some or all parts of multipart geometry or the geometry of single part geometries.

• Copy source geometry
• Select destination feature
• Delete Part
• Add Part

Answer 4

Just to document an alternative solution, which I had to come up with because I found that the Geometry Paster plugin had some limitations with geometries that had large numbers of vertices.

There are also some different situations which required a bit more flexibility, or less map interaction, which the solution below allowed me to have.

I use the Field Calculator on a single record selection. Select the 'Update Existing Field' and under there, there is '' available as an option.

Then - it depends on where the source of the geometry is coming from, but lets say, the source is from another layer which has a record that contains the geometry I want in the destination layer.

The following expression will work.

geometry(get_feature_by_id(layer,feature_id))

Where 'layer' is simply the name of the layer as derived from the Map Layers listing. eg: 'permit_5ce54d18_5c0b_4297_930f_2212956c9e78' feature_id is just the fid, or other record ID.