I'm creating a fictive map and so I need to create lots of points, lines and for sure polygons. Later on I export my data as geojson. But before that I aways have to go and give every element an unique ID.
I don't need a special sorting, like the biggest polygon gets the smallest ID or so. I just need all polygons with an ID at the end, without doing it manually like I have to do now.
Would be great if someone knows how to do that. Thanks.