PostGIS in an award-winning core part of most of open source webGIS solutions. We are using PostGIS from the beginning of our GIS activity an we collect wide knowledge about it. That’s why we are so proud and happy that cofounder of GIS Support – Michał Mackiewicz – is sharing his knowledge and become a coauthor of “Mastering PosGIS. Create, deliver and consume spatial data using PostGIS“. Congratulations to Michał and a rest of the team.