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PostGIS Essentials by Angel Marquez

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Why PostGIS?

PostGIS is an extension of the powerful PostgreSQL, one of the most reliable open source DBMS available, which has spent a lot of time on the market, but what makes it such a good platform for PostGIS is the fact that it implements something called Generic Index Structure (GIST), which allows it to build indexes in almost any kind of data type. Given this flexibility and the fact that the structure of PostgreSQL gives you the chance to build custom functions very tightly to the core, PostGIS could by developed in a natural way. This is because it basically adds spatial data, spatial indexes, and spatial functions to the existing features of PostgreSQL without any complicated, intermediate, or special conversion processes. The other ...

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