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 work with ArcGis 10.2. I need to find the longest vector in a couple of parallel vectors. They are extracted from an Intersect of Streets buffer and a flooding limit. So I have sometimes only one ...