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  • Book Overview & Buying QGIS By Example
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QGIS By Example

QGIS By Example

By : Daria Svidzinska
4.5 (4)
Buy this Book
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QGIS By Example

QGIS By Example

4.5 (4)
By: Daria Svidzinska
Buy this Book

Overview of this book

If you are a beginner or an intermediate GIS user, this book is for you. It is ideal for practitioners, data analysts, and application developers who have very little or no familiarity with geospatial data and software.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Handling Your Data
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1. Handling Your Data
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Installing QGIS
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GUI elements and customization
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Extending functionality through plugins
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Loading data into QGIS
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Dealing with projections
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Loading layers to a spatial database
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Summary
2
2. Visualizing and Styling the Data
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2. Visualizing and Styling the Data
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Loading layers from the spatial database
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Grouping and reordering layers
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Developing your own styles
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Adding labels
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Managing styles
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Adding base maps
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Summary
3
3. Presenting Data on a Print Map
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3. Presenting Data on a Print Map
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Print composer
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The initial setup – page format and other essentials
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Adding and customizing a map
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Adding and customizing a legend
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Other map items
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Working with multiple maps and overviews
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Managing print composers
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Summary
4
4. Publishing the Map Online
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4. Publishing the Map Online
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Registering for the QGIS Cloud service
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The QGIS Cloud plugin
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Creating a database
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Publishing the map
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Viewing your map in QGIS and a browser
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Deleting unused maps
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Summary
5
5. Answering Questions with Density Analysis
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5. Answering Questions with Density Analysis
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Density analysis and heatmaps
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Creating heat maps with the Heatmap plugin
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Mapping density with a hexagonal grid
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Summary
6
6. Answering Questions with Visibility Analysis
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6. Answering Questions with Visibility Analysis
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The basics of visibility analysis
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Step 1 – converting a buildings' vector layer to raster
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Step 2 – combining the DEM and buildings layers
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Step 3 – defining observation points
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Step 4 – creating viewshed coverages
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Step 5 – finding scenic points
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Step 6 – styling the results in 3D
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Summary
7
7. Answering Questions with Suitability Analysis
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7. Answering Questions with Suitability Analysis
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Basics of suitability analysis
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Step 1 – define the goal and objectives of our analysis
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Step 2 – analyze the available data and define its relevance
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Step 3 – define the criteria of analysis
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Step 4 – Analyze and prepare the data
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Step 5 – overlay the data and interpret the results
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Summary
8
8. Automating Analysis with Processing Models
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8. Automating Analysis with Processing Models
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The QGIS Processing framework
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Graphical Modeler
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Adding inputs
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Implementing the workflow
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Filling model metadata and saving
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Editing models
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Sharing models
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Summary
9
9. Automating Analysis with Processing Scripts
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9. Automating Analysis with Processing Scripts
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Python scripts in Processing
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Defining inputs and outputs
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Implementing the algorithm
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Writing help and saving
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Sharing scripts
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Summary
10
10. Developing a Python Plugin – Select by Radius
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10. Developing a Python Plugin – Select by Radius
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QGIS plugins
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Creating the plugin's skeleton
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Designing the plugin's GUI
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Using Designer UI files in the plugin
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Implementing feature selection
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Adding translations
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Preparing the plugin for publishing
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Summary
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Index
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Index

Chapter 5. Answering Questions with Density Analysis

We often need to work with large and dense datasets in which there is a lot of overplotting and features experience significant overlap. Such datasets may be very slow at rendering because they contain thousands, or even millions, of features, and very difficult to interpret because overlaps make it difficult to detect any clusters or distribution patterns. In this chapter, you will learn the techniques that allow you to visualize such datasets in a more readable and faster way by displaying feature density instead of the features themselves. By the end of this chapter, you will be able to perform density analysis of your data and extract information from density maps.

In this chapter, we will go through the following topics:

  • Density analysis and heat maps
  • Creating heat maps with the Heatmap plugin
  • Mapping density with a hexagonal grid
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Programming languages
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QGIS By Example
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