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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 5 – overlay the data and interpret the results


Now we have everything ready for overlaying the rasters and generating a cumulative suitability assessment. In the following table, you can see the full list of layers, weighted by their importance for general suitability. Weights are simple coefficients within a range of 0 to 1, and they are used to modify the rank properly.

No.

Raster layer name

Raster layer type

Rank min

Rank max

Weight coefficient

Max possible value = max rank * weight

1

athletic_facilities_proximity_ranks

Proximity

1

5

0.04

0.2

2

bike_routes_proximity_ranks

Proximity

1

3

0.06

0.18

3

hurricane_evacuation_zones

Zoning

1

7

0.16

1.12

4

hurricane_inundation_zones

Zoning

1

5

0.16

0.8

5

Museumart_ranked

Density

1

4

0.05

0.2

6

Noise_ranked

Density

1

5

0.13

0.65

7

Parks_proximity_ranks

Proximity

1

3

0.12

0.36

8

Schools_proximity_ranks

Proximity

1

4

0.15

0.6

9

subway_entrances_proximity_ranks

Proximity

1

4

0...

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