[postgis-users] how to create holes in polygon

Hi, I am trying to punch holes into a polygon - can someone tell me how to achieve this? I have a large database of polygon geometries. I am now trying to "invert" these polygons area to receive a big polygon, that covers everything that is *not* covered in my existing polygons. The result shou

[postgis-users] distance between multiple polygons

Hello! I have to find out which polygons have the longest distance between any two polygons (or points of them) from a set of multiple polygons. For example: I have 5 polygons. Find out where's the biggest distance between them and give back the two points. I need this to be able to zoom in/o