Before going further into this book, you will want to install latest versions of PostgreSQL and PostGIS (9.6 or 103 and 2.3 or 2.41, respectively). You may also want to install pgAdmin (1.18) if you prefer a graphical SQL tool. For most computing environments (Windows, Linux, macOS X), installers and packages include all required dependencies of PostGIS. The minimum required dependencies for PostGIS are PROJ.4, GEOS, libjson and GDAL. A basic understanding of the SQL language is required to understand and adapt the code found in this book's recipes.
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