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  • Book Overview & Buying Mastering QGIS
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Mastering QGIS

Mastering QGIS

By : Kurt Menke, GISP
4.6 (12)
Buy this Book
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Mastering QGIS

Mastering QGIS

4.6 (12)
By: Kurt Menke, GISP
Buy this Book

Overview of this book

If you are a GIS professional, a consultant, a student, or perhaps a fast learner who wants to go beyond the basics of QGIS, then this book is for you. It will prepare you to realize the full potential of QGIS.
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. A Refreshing Look at QGIS
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1. A Refreshing Look at QGIS
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QGIS download and installation
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Tour of QGIS
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Loading data
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Working with coordinate reference systems
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Working with tables
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Editing data
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Composing maps
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Adding functionality with plugins
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Summary
2
2. Creating Spatial Databases
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2. Creating Spatial Databases
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Fundamental database concepts
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Creating a spatial database
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Importing data into a SpatiaLite database
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Exporting tables out of SpatiaLite as a shapefile
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Managing tables
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Creating queries and views
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Summary
3
3. Styling Raster and Vector Data
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3. Styling Raster and Vector Data
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Choosing and managing colors
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Managing color ramps
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Styling single band rasters
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Styling multiband rasters
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Creating a raster composite
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Raster color rendering
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Raster resampling
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Styling vectors
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Vector layer rendering
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Using diagrams to display thematic data
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Saving, loading, and setting default styles
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Summary
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4. Preparing Vector Data for Processing
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4. Preparing Vector Data for Processing
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Merging shapefiles
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Creating spatial indices
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Checking for geometry errors
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Converting vector geometries
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Using basic vector geoprocessing tools
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Defining coordinate reference systems
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Advanced field calculations
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Complex spatial and aspatial queries
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Summary
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5. Preparing Raster Data for Processing
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5. Preparing Raster Data for Processing
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Reclassifying rasters
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Rescaling rasters
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Creating a raster mosaic
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Generating raster overviews (pyramids)
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Converting between raster and vector data models
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Creating raster surfaces via interpolation
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Summary
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6. Advanced Data Creation and Editing
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6. Advanced Data Creation and Editing
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Creating points from coordinate data
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Geocoding address-based data
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Georeferencing imagery
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Checking the topology of vector data
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Repairing topological errors via topological editing
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Summary
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7. The Processing Toolbox
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7. The Processing Toolbox
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About the processing toolbox
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Performing raster analyses with GRASS
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SAGA
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Exploring hydrologic analyses with TauDEM
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R
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Summary
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8. Automating Workflows with the Graphical Modeler
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8. Automating Workflows with the Graphical Modeler
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An introduction to the graphical modeler
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Opening the graphical modeler
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Configuring the modeler and naming a model
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Adding inputs
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Adding algorithms
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Running a model
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Editing a model
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Documenting a model
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Saving, loading, and exporting models
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Executing model algorithms iteratively
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Nesting models
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Using batch processing with models
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Converting a model into a Python script
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Summary
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9. Creating QGIS Plugins with PyQGIS and Problem Solving
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9. Creating QGIS Plugins with PyQGIS and Problem Solving
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Webography - where to get API information and PyQGIS help
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The Python Console
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Exploring iface and QGis
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Exploring a QGIS API in the Python Console
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Creating a plugin structure with Plugin Builder
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A simple plugin example
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Setting up a debugging environment
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Debugging session example
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Summary
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10. PyQGIS Scripting
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10. PyQGIS Scripting
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Where to learn Python basics
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Loading layers
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Vector structure
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Iterating over features
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Editing features
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Running processing toolbox algorithms
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Running an external algorithm or command
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Interacting with the map canvas
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Summary
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Index
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Index

Nesting models

As we previously covered, when a model is saved to the Models folder, it will appear in the Models category of the Processing Toolbox panel. What we didn't mention earlier was that it will also appear in the Algorithms tab of the Processing modeler window. This means that a previously written model can be used as an algorithm in another model.

Note

Models won't appear as algorithms if some of their component algorithms are not available. This can happen if an algorithm provider is deactivated in Providers, and you can find this by navigating to Processing | Options. For example, if you have used a SAGA tool in a model but have subsequently deactivated SAGA tools, that model will not be available. As long as all the algorithms in a model are visible in the Processing Toolbox panel, a model will be available as an algorithm.

To demonstrate this feature, we will build on the model that we used in the previous section. The model clipped elevation data by watershed boundaries. With...

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