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Practical GIS

You're reading from   Practical GIS Learn novice to advanced topics such as QGIS, Spatial data analysis, and more

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781787123328
Length 428 pages
Edition 1st Edition
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Author (1):
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G√°bor Farkas G√°bor Farkas
Author Profile Icon G√°bor Farkas
G√°bor Farkas
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Table of Contents (15) Chapters Close

Preface 1. Setting Up Your Environment FREE CHAPTER 2. Accessing GIS Data With QGIS 3. Using Vector Data Effectively 4. Creating Digital Maps 5. Exporting Your Data 6. Feeding a PostGIS Database 7. A PostGIS Overview 8. Spatial Analysis in QGIS 9. Spatial Analysis on Steroids - Using PostGIS 10. A Typical GIS Problem 11. Showcasing Your Data 12. Styling Your Data in GeoServer 13. Creating a Web Map Appendix

Matching the rest of the criteria

We have two additional tasks to complete in order to match the common preferences of our customers. If you do not remember the exact preferences, here they are again:

  • They should be less than 500 meters away from a park with a playground
  • They should be less than 500 meters away from a restaurant
  • They should be less than 500 meters away from a bar or a pub
  • There should be at least two markets within their 500 meters vicinity

The first three criteria can be easily matched building on the queries of the previous section. We only have to create three CTE tables or subqueries; one for the parks with playgrounds in their 200 meters vicinity, one for the restaurants, and one for the bars and pubs. After that, we only have to match our houses by using distance checks. Such a query can be formulated as follows:

    WITH parks_with_playgrounds AS (
...
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