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python QGIS二次开发说明文档.pdf

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    QGIS Python Programming Cookbook - Second Edition
    Credits
    About the Author
    About the Reviewer
    www.PacktPub.com
    Why subscribe?
    Customer Feedback
    Preface
    What this book covers
    What you need for this book
    Who this book is for
    Sections
    Getting ready
    How to do it…
    How it works…
    There's more…
    See also
    Conventions
    Reader feedback
    Customer support
    Downloading the example code
    Downloading the color images of this book
    Errata
    Piracy
    Questions
    1. Automating QGIS
    Introduction
    Installing QGIS 2.18 for development
    Getting ready
    How to do it...
    Installing PyQGIS using the Debian package manager
    Installing PyQGIS using the RPM package manager
    Setting the environment variables
    Setting the environment variables on Windows
    Setting environment variables on Linux
    How it works...
    There's more...
    Finding the PyQGIS path on Windows
    Finding the location of the QGIS Python installation on other platforms
    Using the QGIS Python console for interactive control
    How to do it...
    How it works...
    Automatically starting the Python console
    Getting ready
    How to do it...
    How it works...
    Using the Python's Script Runner plugin
    Getting ready
    How to do it...
    How it works...
    There's more...
    Setting up your QGIS IDE
    Getting ready
    How to do it...
    Adding the Python interpreter to Windows
    Adding the PyQGIS module paths to the interpreter
    Adding the PyQGIS API to the IDE
    Adding environment variables
    How it works...
    Debugging QGIS Python scripts
    How to do it...
    Configuring QGIS
    Configuring Eclipse
    Testing the debugger
    How it works...
    Navigating the PyQGIS API
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a traditional QGIS plugin
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a Processing Toolbox plugin
    Getting ready
    How to do it...
    How it works...
    There's more...
    Distributing a plugin
    Getting ready
    How to do it...
    How it works...
    Building a standalone application
    Getting ready
    How to do it...
    How it works...
    There's more...
    Storing and reading global preferences
    Getting ready
    How to do it...
    How it works...
    There's more...
    Storing and reading project preferences
    Getting ready
    How to do it...
    How it works...
    There's more...
    Accessing the script path from within your script
    Getting ready
    How to do it...
    How it works...
    There's more...
    2. Querying Vector Data
    Introduction
    Loading a vector layer from a file sample
    Getting ready
    How to do it...
    How it works...
    Loading a vector layer from a geodatabase
    Getting ready
    How to do it...
    How it works...
    Examining vector layer features
    Getting ready
    How to do it...
    How it works...
    Examining vector layer attributes
    Getting ready
    How to do it...
    How it works...
    There's more...
    Filtering a layer by geometry
    Getting ready
    How to do it...
    How it works...
    Filtering a layer by attributes
    Getting ready
    How to do it...
    How it works...
    Buffering a feature
    Getting ready
    How to do it...
    How it works...
    Measuring the distance between two points
    Getting ready
    How to do it...
    How it works...
    Measuring distance along a line
    Getting ready
    How to do it...
    How it works...
    Calculating the area of a polygon
    Getting ready
    How to do it...
    How it works...
    Creating a spatial index
    Getting ready
    How to do it...
    How it works...
    Calculating the bearing of a line
    Getting ready
    How to do it...
    How it works...
    Loading data from a spreadsheet
    Getting ready
    How to do it...
    How it works...
    There's more...
    Accessing layer metadata
    Getting ready
    How to do it...
    How it works...
    3. Editing Vector Data
    Introduction
    Creating a vector layer in memory
    Getting ready
    How to do it...
    How it works...
    Adding a point feature to a vector layer
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding a line feature to a vector layer
    Getting ready
    How to do it...
    How it works...
    Adding a polygon feature to a vector layer
    Getting ready
    How to do it...
    How it works...
    Adding a set of attributes to a vector layer
    Getting ready...
    How to do it...
    How it works...
    Adding a field to a vector layer
    Getting ready
    How to do it...
    How it works...
    Joining a shapefile attribute table to a CSV file
    Getting ready
    How to do it...
    How it works...
    There's more...
    Changing vector layer geometry
    Getting ready
    How to do it...
    How it works...
    Changing a vector layer feature's attribute
    Getting ready
    How to do it...
    How it works...
    Removing data from a vector layer
    Getting ready
    How to do it....
    How it works...
    Deleting a vector layer feature's attribute
    Getting ready
    How to do it...
    How it works...
    Reprojecting a vector layer
    Getting ready
    How to do it...
    How it works...
    Converting a shapefile to KML or GeoJSON
    Getting ready
    How to do it...
    How it works...
    There's more...
    Merging shapefiles
    Getting ready
    How to do it...
    How it works...
    There's more...
    Splitting a shapefile
    Getting ready
    How to do it...
    How it works...
    Generalizing a vector layer
    Getting ready
    How to do it...
    How it works...
    Dissolving vector features
    Getting ready
    How to do it...
    How it works...
    Performing a union on vector shapes
    Getting ready
    How to do it...
    How it works...
    Rasterizing a vector layer
    Getting ready
    How to do it...
    How it works...
    Exporting a layer to the GeoPackage format
    Getting ready
    How to do it...
    How it works...
    4. Using Raster Data
    Introduction
    Loading a raster layer
    Getting ready
    How to do it...
    How it works...
    Loading a NetCDF file
    Getting ready
    How to do it...
    How it works...
    Getting the cell size of a raster layer
    Getting ready
    How to do it...
    How it works...
    Obtaining the width and height of a raster
    Getting ready
    How to do it...
    How it works...
    Counting raster bands
    Getting ready
    How to do it...
    How it works...
    Swapping raster bands
    Getting ready
    How to do it...
    How it works...
    There's more...
    Querying the value of a raster at a specified point
    Getting ready
    How to do it...
    How it works...
    Reprojecting a raster
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating an elevation hillshade
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating vector contours from elevation data
    Getting ready
    How to do it...
    How it works...
    Sampling a raster dataset using a regular grid
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding elevation data to a line vertices using a digital elevation model
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a common extent for rasters
    Getting ready
    How to do it...
    How it works...
    Resampling raster resolution
    Getting ready
    How to do it...
    How it works...
    Counting the unique values in a raster
    Getting ready
    How to do it...
    How it works...
    Mosaicing rasters
    Getting ready
    How to do it...
    How it works...
    Converting a TIFF image to a JPEG image
    Getting ready
    How to do it...
    How it works...
    Creating pyramids for a raster
    Getting ready
    How to do it...
    How it works...
    Converting a pixel location to a map coordinate
    Getting ready
    How to do it...
    How it works...
    Converting a map coordinate to a pixel location
    Getting ready
    How to do it...
    How it works...
    Creating a KML image overlay for a raster
    Getting ready
    How to do it...
    How it works...
    There's more...
    Classifying a raster
    Getting ready
    How to do it...
    How it works...
    Converting a raster to a vector
    Getting ready
    How to do it...
    How it works...
    Georeferencing a raster from control points
    Getting ready
    How to do it...
    How it works...
    Clipping a raster using a shapefile
    Getting ready
    How to do it...
    How it works...
    5. Creating Dynamic Maps
    Introduction
    Accessing the map canvas
    Getting ready
    How to do it...
    How it works...
    Changing the map units
    Getting ready
    How to do it...
    How it works...
    Iterating over layers
    Getting ready
    How to do it...
    How it works...
    Symbolizing a vector layer
    Getting ready
    How to do it...
    How it works...
    Setting a transparent layer fill
    Getting ready
    How to do it...
    How it works...
    Using a filled marker symbol
    Getting ready
    How to do it...
    Rendering a single band raster using a color ramp algorithm
    Getting ready
    How to do it...
    How it works...
    Setting a feature's color using a column in a CSV file
    Getting ready
    How to do it...
    How it works...
    Creating a complex vector layer symbol
    Getting ready
    How to do it...
    How it works...
    Using icons as vector layer symbols
    Getting ready
    How to do it...
    How it works...
    Using an outline for font markers
    Getting ready
    How to do it...
    How it works...
    Using arrow symbols
    Getting ready
    How to do it...
    How it works...
    Creating a graduated vector layer symbol renderer
    Getting ready
    How to do it...
    How it works...
    Creating a categorized vector layer symbol
    Getting ready
    How to do it...
    How it works...
    Using live layer effects
    Getting ready
    How to do it...
    How it works...
    Creating inverted polygon shapeburst fills
    Getting ready
    How to do it...
    How it works...
    Creating a map bookmark
    Getting ready
    How to do it...
    How it works...
    Navigating to a map bookmark
    Getting ready
    How to do it...
    How it works...
    Setting scale-based visibility for a layer
    Getting ready
    How to do it...
    How it works...
    Using SVG for layer symbols
    Getting ready
    How to do it...
    How it works...
    Using pie charts for symbols
    Getting ready
    How to do it...
    How it works...
    There's more...
    Using the 2.5D renderer
    Getting ready
    How to do it...
    How it works...
    Using XYZ tiled map services
    Getting ready
    How to do it...
    How it works...
    Using Esri ArcGIS map services
    Getting Ready
    How to do it...
    How it works...
    Labeling a feature
    Getting ready
    How to do it...
    How it works...
    Using null symbols
    Getting ready
    How to do it...
    How it works...
    Change map layer transparency
    Getting ready
    How to do it...
    How it works...
    Adding standard map tools to the canvas
    Getting ready
    How to do it...
    How it works...
    Using a map tool to draw points on the canvas
    Getting ready
    How to do it...
    How it works...
    Using a map tool to draw polygons or lines on the canvas
    Getting ready
    How to do it...
    How it works...
    Building a custom selection tool
    Getting ready
    How to do it...
    How it works...
    Creating a mouse coordinate tracking tool
    Getting ready
    How to do it...
    How it works...
    6. Composing Static Maps
    Introduction
    Creating the simplest map renderer
    Getting ready
    How to do it...
    How it works...
    There's more...
    Using the Map Composer
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding labels to a map for printing
    Getting ready
    How to do it...
    How it works...
    Adding a scale bar to a map
    Getting ready
    How to do it...
    How it works...
    Adding a North arrow to the map
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding a logo to the map
    Getting ready
    How to do it...
    How it works...
    Adding a vertical legend to the map
    Getting ready
    How to do it...
    How it works...
    Adding a horizontal legend
    Getting ready
    How to do it...
    Adding a custom shape to the map
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding a grid to the map
    Getting ready
    How to do it...
    How it works...
    Adding a table to the map
    Getting ready
    How to do it...
    How it works...
    Adding a world file to a map image
    Getting ready
    How to do it...
    How it works...
    Saving a map to a project
    Getting ready
    How to do it...
    How it works...
    Loading a map from a project
    Getting ready
    How to do it...
    How it works...
    7. Interacting with the User
    Introduction
    Using log files
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a simple message dialog
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a warning dialog
    Getting ready
    How to do it...
    How it works...
    Creating an error dialog
    Getting ready
    How to do it...
    How it works...
    Displaying a progress bar
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a simple text input dialog
    Getting ready
    How to do it...
    How it works...
    Creating a file input dialog
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a combobox
    Getting ready
    How to do it...
    How it works...
    Creating radio buttons
    Getting ready
    How to do it...
    How it works...
    Creating checkboxes
    Getting ready
    How to do it...
    How it works...
    Creating a dock widget
    Getting ready
    How to do it...
    How it works...
    Displaying a message in the status bar
    Getting ready
    How to do it...
    How it works...
    Pushing messages to the message bar
    Getting ready
    How to do it...
    How it works...
    Pushing widgets to the message bar
    Getting ready
    How to do it...
    How it works...
    Creating tabs
    Getting ready
    How to do it...
    How it works...
    Stepping the user through a wizard
    Getting ready
    How to do it...
    How it works...
    Keeping dialogs on top
    Getting ready
    How to do it...
    How it works...
    8. QGIS Workflows
    Introduction
    Creating an NDVI
    Getting ready
    How to do it...
    How it works...
    Geocoding addresses
    Getting ready
    How to do it...
    How it works...
    Creating raster footprints
    Getting ready
    How to do it...
    How it works...
    There's more...
    Performing network analysis
    Getting ready
    How to do it...
    How it works...
    There's more...
    Routing along streets
    Getting ready
    How to do it...
    How it works...
    Tracking a GPS
    Getting ready
    How to do it...
    How it works...
    There's more...
    Creating a mapbook
    Getting ready
    How to do it...
    How it works...
    Finding the least cost path
    Getting ready
    How to do it...
    How it works...
    Performing nearest neighbor analysis
    Getting ready
    How to do it...
    How it works...
    Creating a DEM from LIDAR
    Getting ready
    How to do it...
    How it works...
    Creating a heat map
    Getting ready
    How to do it...
    How it works...
    Creating a dot density map
    Getting ready
    How to do it...
    How it works...
    Collecting field data
    Getting ready
    How to do it...
    How it works...
    Computing road slope using elevation data
    Getting ready
    How to do it...
    How it works...
    Geolocating photos on the map
    Getting ready
    How to do it...
    How it works...
    There's more...
    Image change detection
    Getting ready
    How to do it...
    How it works...
    Adjusting imprecise building footprints
    Getting ready
    How to do it...
    How it works...
    Visualizing multitemporal data
    Getting ready
    How to do it...
    How it works...
    9. Other Tips and Tricks
    Introduction
    Creating tiles from a QGIS map
    Getting ready
    How to do it...
    How it works...
    There's more...
    Adding a layer to geojson.io
    Getting ready
    How to do it...
    How it works...
    There's more...
    Rendering map layers based on rules
    Getting ready
    How to do it...
    How it works...
    Creating a layer-definition file
    Getting ready
    How to do it...
    How it works...
    Using NULL values in PyQGIS
    Getting ready
    How to do it...
    How it works...
    Using generators for layer queries
    Getting ready
    How to do it...
    How it works...
    Using alpha values to show data density
    Getting ready
    How to do it...
    How it works...
    Using the __geo_interface__ protocol
    Getting ready
    How to do it...
    How it works...
    Getting the output file names from processing algorithms
    Getting ready
    How to do it...
    How it works...
    Generating points along a line
    Getting ready
    How to do it...
    How it works...
    There's more...
    Using expression-based labels
    Getting ready
    How to do it...
    How it works...
    Creating dynamic forms in QGIS
    Getting ready
    How to do it...
    How it works...
    There's more...
    Calculating length for all selected lines
    Getting ready
    How to do it...
    How it works...
    Using a different status bar CRS than the map
    Getting ready
    How to do it...
    How it works...
    Creating HTML labels in QGIS
    Getting ready
    How to do it...
    How it works...
    There's more...
    Using OpenStreetMap points of interest in QGIS
    Getting ready
    How to do it...
    How it works...
    Changing the QGIS web proxy
    Getting ready
    How to do it...
    How it works...
    There's more...
    Running QGIS scripts as scheduled tasks
    Getting ready
    How to do it...
    How it works...
    Visualizing data in 3D with WebGL
    Getting ready
    How to do it...
    How it works...
    Visualizing data on a globe
    Getting ready
    How to do it...
    How it works...
    Make a globe-like azimuthal orthographic projection
    Getting ready
    How to do it...
    How it works...
    Animating a layer
    Getting ready
    How to do it...
    QGIS Python Programming Cookbook - Second Edition
    Table of Contents QGIS Python Programming Cookbook - Second Edition Credits About the Author About the Reviewer www.PacktPub.com Why subscribe? Customer Feedback Preface What this book covers What you need for this book Who this book is for Sections Getting ready How to do it… How it works… There's more… See also Conventions Reader feedback Customer support Downloading the example code Downloading the color images of this book Errata Piracy Questions 1. Automating QGIS Introduction Installing QGIS 2.18 for development Getting ready How to do it... Installing PyQGIS using the Debian package manager Installing PyQGIS using the RPM package manager Setting the environment variables Setting the environment variables on Windows Setting environment variables on Linux How it works... There's more... How to do it... Finding the PyQGIS path on Windows Finding the location of the QGIS Python installation on other platforms Using the QGIS Python console for interactive control
    Automatically starting the Python console Using the Python's Script Runner plugin How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Getting ready How to do it... Setting up your QGIS IDE Adding the Python interpreter to Windows Adding the PyQGIS module paths to the interpreter Adding the PyQGIS API to the IDE Adding environment variables How it works... Debugging QGIS Python scripts How to do it... Configuring QGIS Configuring Eclipse Testing the debugger How it works... Navigating the PyQGIS API Creating a traditional QGIS plugin Creating a Processing Toolbox plugin Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... There's more... Distributing a plugin Getting ready How to do it... How it works... Building a standalone application Getting ready
    Storing and reading global preferences Storing and reading project preferences Accessing the script path from within your script 2. Querying Vector Data Introduction Loading a vector layer from a file sample Loading a vector layer from a geodatabase How to do it... How it works... There's more... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Examining vector layer features Examining vector layer attributes Filtering a layer by geometry Filtering a layer by attributes
    Measuring the distance between two points Buffering a feature Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Measuring distance along a line Calculating the area of a polygon Creating a spatial index Calculating the bearing of a line Loading data from a spreadsheet Accessing layer metadata Getting ready How to do it... How it works... 3. Editing Vector Data Introduction Creating a vector layer in memory Adding a point feature to a vector layer Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Adding a line feature to a vector layer
    Adding a polygon feature to a vector layer Adding a set of attributes to a vector layer Adding a field to a vector layer Joining a shapefile attribute table to a CSV file Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready... How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it.... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... There's more... Changing vector layer geometry Changing a vector layer feature's attribute Removing data from a vector layer Deleting a vector layer feature's attribute Reprojecting a vector layer Converting a shapefile to KML or GeoJSON
    Merging shapefiles Getting ready How to do it... How it works... There's more... Splitting a shapefile Getting ready How to do it... How it works... Generalizing a vector layer Dissolving vector features Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Performing a union on vector shapes Rasterizing a vector layer Exporting a layer to the GeoPackage format Getting ready How to do it... How it works... 4. Using Raster Data Introduction Loading a raster layer Loading a NetCDF file Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready How to do it... How it works... Getting ready Getting the cell size of a raster layer Obtaining the width and height of a raster
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