Book Image

Mastering PostGIS

By : Dominik Mikiewicz, Michal Mackiewicz , Tomasz Nycz
Book Image

Mastering PostGIS

By: Dominik Mikiewicz, Michal Mackiewicz , Tomasz Nycz

Overview of this book

PostGIS is open source extension onf PostgreSQL object-relational database system that allows GIS objects to be stored and allows querying for information and location services. The aim of this book is to help you master the functionalities offered by PostGIS- from data creation, analysis and output, to ETL and live edits. The book begins with an overview of the key concepts related to spatial database systems and how it applies to Spatial RMDS. You will learn to load different formats into your Postgres instance, investigate the spatial nature of your raster data, and finally export it using built-in functionalities or 3th party tools for backup or representational purposes. Through the course of this book, you will be presented with many examples on how to interact with the database using JavaScript and Node.js. Sample web-based applications interacting with backend PostGIS will also be presented throughout the book, so you can get comfortable with the modern ways of consuming and modifying your spatial data.
Table of Contents (9 chapters)

Summary


PostGIS can store and analyze vector data not only in the Simple Feature model, but also in a topological model. This model is a good fit for data such as networks and boundaries, where connectivity and topological consistency are important. The toolset available is not as rich as Simple Feature's toolset, but all common processing tasks, such as creating, editing, merging, and splitting, can be accomplished with available functions. A very useful feature is the ability to simplify features while maintaining the topological integrity. Also, just by importing data into topology, some minor inconsistencies, such as unconnected lines, can be automatically fixed.