qgisqgis-3
I have received a polygon layer as a shapefile in which the number of features is shown in brackets in the name. (QGIS3.16.10)
When I copied the layer, this feature disappeared and I have searched unsuccessfully to find it in the settings. Does anyone know how I can make it work?
To update Curlew above, as of QGIS 2.18, you would use the built-in Advanced Digitizing Toolbar, which can be accessed via View > Toolbars > Advanced Digitizing Toolbar. The toolbar will look like this and the "Split Features" button is the fifth from the right:
With that loaded, and the respective later selected and in Edit mode, select the "Split Features" tool and use it to draw through the place(s) where you want to create segments. You can then use the "Node Tool" to select vertices and move them wherever the new segments should be positioned. A quick summary looks like this:
In the end, each segment will then become an independent feature in your vector layer. Be sure to save your edits!
For more information, see the QGIS user manual section on advanced digitizing.
Is there a field in the attribute table you can use to group the smaller sets by? If so, you can use ogr2ogr's -sql switch to specify a query that will pull just those records and export them to their own shapefile.
Boston GIS's site has a nice ogr2ogr cheatsheet if you need an example to work from
http://www.bostongis.com/?content_name=ogr_cheatsheet
That said, with a million records I would stuff that sucker into a PostGIS database. It would almost certainly be faster to work with, especially if those features are complex.
Best Answer
Right-click the layer name and select Show Feature Count - Thank You Matt