I'm looking for the best ways to 'group' a budge of block polygons in a new polygon that should be the town.
My block layer is something like this:
And I'm looking to get something like this polygon (the left one):
Could somebody tell me some indications of how to get something like this? I'm not looking for the best accuracy, but something close to town or city polygons.
I thought in a convex hull, but the problem is that the block layer are a lot of polygons, instead of an irregular one.
I'm sure that PostGIS has some process that approximates to my goal, but I can't find it.