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QGIS By Example

You're reading from   QGIS By Example Leverage the power of QGIS in real-world applications to become a powerful user in cartography and GIS analysis

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781782174677
Length 316 pages
Edition 1st Edition
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Toc

Table of Contents (12) Chapters Close

Preface 1. Handling Your Data FREE CHAPTER 2. Visualizing and Styling the Data 3. Presenting Data on a Print Map 4. Publishing the Map Online 5. Answering Questions with Density Analysis 6. Answering Questions with Visibility Analysis 7. Answering Questions with Suitability Analysis 8. Automating Analysis with Processing Models 9. Automating Analysis with Processing Scripts 10. Developing a Python Plugin – Select by Radius Index

Step 3 – define the criteria of analysis


According to the description of hurricane_evacuation_zones, there are six zones, ranked in the attribute field zone by risk of storm surge impact, with zone 1 being the region most likely to be flooded. In the event of a hurricane or tropical storm, residents in these zones may be ordered to evacuate. Areas with a zone value of X are not in any evacuation zone. Areas with a zone value of 0 are any of the following: water, small piers, or uninhabited islands. For the purpose of analysis, this layer should be rasterized and ranked according to the risk of hurricane impact, with rank values descending from areas that are not in any evacuation zone to those most likely to be flooded.

The hurricane_inundation_zones polygon layer contains information about the risk of storm surge inundation in the category attribute field, in which the value is the surge height in feet. Areas that are most likely to be inundated are assigned a value of 1, and areas that...

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