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If you are running PostgreSQL as a service from a cloud provider (not installing it yourself) then you probably already have PostGIS installed, and you just need to enable it in your database. Connect to your database as the postgres user or another super-user account, and run:

About PostGIS PostGIS extends the capabilities of the PostgreSQL relational database by adding support for storing, indexing, and querying geospatial data. PostGIS features include: Spatial Data Storage: Store different types of spatial data such as points, lines, polygons, and multi-geometries, in both 2D and 3D data. Spatial Indexing: Quickly search and retrieve spatial data based on its locatio