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
1
Section 1: Getting Started with Geospatial Analytics
6
Section 2: SQL for Spatial Analytics

Building SQL Queries Visually in a Graphical Query Builder

In the previous chapter, you were introduced to topological spatial queries such as distance, buffers, and proximity to characteristics of a variety of entities.

In this chapter, we will continue exploring the tools and concepts available for learning about SQL and applying this knowledge to geospatial analysis. Writing SQL queries into QGIS allows you to visualize output directly on a map. pgAdmin also allows a quick look at a snapshot of your data using Geometry Viewer but without a lot of customization.

Discovering quick and efficient tools for integrating database queries with the SQL query builder builds on the query language you are already scripting.

In this chapter, you will learn about the following topics:

  • How to access the Graphical Query Builder (GQB)
  • How to write complex queries in the SQL query builder
  • Beginning to build advanced frameworks for our data exploration