Vector operation functions can be used as a rich geoprocessing toolbox, all without leaving the database environment. Using nothing but Spatial SQL, one can split and merge features, reproject them, create buffers and hulls, offset geometries, and much more. And when it comes to querying, PostGIS offers fine-grained spatial relationship functions to pick only specific features. This wouldn't be possible without a rich open source GIS ecosystem; the geoprocessing and spatial relationship functions are available thanks to the GEOS library, and reprojections are done with the help of the PROJ.4 library. Other database vendors often choose to implement spatial functions from scratch, and stick to a moderate set of functions defined in the OGC specification. The geoprocessing toolbox is one of PostGIS's greatest strengths. This toolbox is not limited to vector data manipulation. In the next chapter, we will discuss the functions available for raster data processing.
Mastering PostGIS
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Mastering PostGIS
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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.
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Current Title:
Mastering PostGIS
Table of Contents (9 chapters)
Free Chapter
Importing Spatial Data
Spatial Data Analysis
Data Processing - Vector Ops
Data Processing - Raster Ops
Exporting Spatial Data
ETL Using Node.js
PostGIS – Creating Simple WebGIS Applications
PostGIS Topology
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