Book Image

Geospatial Analysis with SQL

By : Bonny P McClain
Book Image

Geospatial Analysis with SQL

By: Bonny P McClain

Overview of this book

Geospatial analysis is industry agnostic and a powerful tool for answering location questions. Combined with the power of SQL, developers and analysts worldwide rely on database integration to solve real-world spatial problems. This book introduces skills to help you detect and quantify patterns in datasets through data exploration, visualization, data engineering, and the application of analysis and spatial techniques. You will begin by exploring the fundamentals of geospatial analysis where you’ll learn about the importance of geospatial analysis and how location information enhances data exploration. Walter Tobler’s second law of geography states, “the phenomenon external to a geographic area of interest affects what goes on inside.” This quote will be the framework of the geospatial questions we will explore. You’ll then observe the framework of geospatial analysis using SQL while learning to create spatial databases and SQL queries and functions. By the end of this book, you will have an expanded toolbox of analytic skills such as PostGIS and QGIS to explore data questions and analysis of spatial information.
Table of Contents (13 chapters)
Free Chapter
Section 1: Getting Started with Geospatial Analytics
Section 2: SQL for Spatial Analytics

Configuring and authenticating PostGIS in QGIS

Although the focus of this chapter is PostGIS and the pgAdmin interface, as a macOS user, I rely on the integration of both to upload data to PostgreSQL. When initially downloading PostGIS, you are required to set a password. This is how you can link databases to QGIS and write spatial queries across platforms. Thankfully, if you do happen to forget or lose it, all is not lost.

In QGIS, head over to Settings and scroll down to Options. On the left-hand side vertical menu, go to Authentication and select Configurations, as shown in Figure 7.1. Here, click on Utilities, erase the authentication database, and recreate your configurations:

Figure 7.1 – Authentication of PostGIS configuration

Figure 7.1 – Authentication of PostGIS configuration

Now that PostGIS has been enabled across platforms, you can work with spatially enabled datasets.

Loading data into PostGIS

The island of Puerto Rico has been hit by island-wide power outages, storms, hurricanes...