I have about 50,000 linestrings in PostGIS. They represent routes along roads. But I want them to be (roughly) pavements (aka sidewalks) instead. So I need to move all the lines 3 metres to the left ...
I am aware of the "Copy Parallels" option from the editing toolbar. It works fine when I'm dealing with 1000 roads or so, but when I need to create parallels for 300,000 roads it takes a long time, as ...
I have a problem with copy parallel. it gives me an error saying "the features couldn't be copied". I already have the new feature layer. The thing is when i select very few lines for example 2 or 3 ...