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Geospatial Analysis with SQL

Geospatial Analysis with SQL

By : Bonny P McClain
4.7 (14)
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Geospatial Analysis with SQL

Geospatial Analysis with SQL

4.7 (14)
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)
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Section 1: Getting Started with Geospatial Analytics
6
Section 2: SQL for Spatial Analytics

SRIDs

Each spatial instance or location has an SRID due to the earth being a non-standard ellipsoid. We talk about the surface of the earth, but what does this mean exactly? Do we plunge to the depths of the ocean floor or the highest mountains? The surface of the earth varies depending on where you are on the surface of the earth.

Spatial reference systems (SRS) allow you to compare different maps. If they are superimposable, they have the identical SRS. The European Petroleum Survey Group (EPSG) is the most popular.

Figure 1.1 visually demonstrates the discrepancy in mapping distances on the surface of the earth. Rotational forces at the poles flatten the earth, creating bulging at the equator. This phenomenon complicates the accurate calculation of the distance between two points located at different latitudes and longitudes on the Earth’s surface. The coordinate system helps to standardize spatial instances:

Figure 1.1 – Ellipsoid shape of the earth

Figure 1.1 – Ellipsoid...

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Geospatial Analysis with SQL
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