PostGIS is a powerful extension to the PostgreSQL database that adds support for geometry types and geospatial functions such as point, line, polygon, distance, area, union, intersection, etc. PostGIS can handle large amounts of data. It is at the core of CartoDB and plays nicely with QGIS, Tilemill / Mapbox Studio and GDAL. In this tutorial, we will see how to install PostGIS … Continue reading How to install PostGIS on Mac OS X