Automated GIS Workflows with PyQGIS [Video]

Automated GIS Workflows with PyQGIS [Video]

By : Joel Lawhead

Buy this Video

Automated GIS Workflows with PyQGIS [Video]

By: Joel Lawhead

Buy this Video

Overview of this book

QGIS is a desktop geographic information system that facilitates data viewing, editing, and analysis. Paired with the most efficient scripting language—Python, we can write effective scripts that extend the core functionality of QGIS. Based on version QGIS 2.18, this video will teach you how to write Python code that works with spatial data to automate geoprocessing tasks in QGIS. It will cover topics such as Creating Dynamic Maps. You will also learn to compose static maps, interact with users. Following this, you will work through recipes that will help you compose static maps, create heavily customized maps, and add specialized labels and annotations. As well as this, we’ll also share a few tips and tricks based on different aspects of QGIS. <h1>Style and Approach</h1> This video follows a recipe-based problem-solution approach to address and dispel challenges faced when implementing and using QGIS on a regular basis. The short, reusable recipes make concepts easy to understand and combine so you can build larger applications that are easy to maintain.

Free Chapter

Creating Dynamic Maps

The Course Overview

Accessing the Map Canvas

Changing the Map Units

Iterating Over Layers

Symbolizing a Vector Layer

Setting a Transparent Layer Fill

Using a Filled Marker Symbol

Rendering a Single Band Raster Using a Color Ramp Algorithm

Setting a Feature's Color Using a Column in a CSV File

Creating a Complex Vector Layer Symbol

Using Icons as Vector Layer Symbols

Using an Outline for Font Markers

Using Arrow Symbols

Creating a Graduated Vector Layer Symbol Renderer

Creating a Categorized Vector Layer Symbol

Using Live Layer Effects

Working with Dynamic Maps

Creating Inverted Polygon Shapeburst Fills

Creating a Map Bookmark

Navigating to a Map Bookmark

Setting Scale-Based Visibility for a layer

Using SVG for Layer Symbols

Using Pie Charts for Symbols

Using the 2.5D Renderer

Using XYZ Tiled and Esri ArcGIS Map Services

Labeling a Feature

Using Null Symbols

Change Map Layer Transparency

Composing Static Map

Creating the Simplest Map Renderer

Using the Map Composer

Adding Labels to a Map for Printing

Adding a Scale Bar, North Arrow and Logo to a Map

Adding a Vertical and a Horizontal Legend to the Map

Adding a Custom Shape, Grid, and Table to the Map

Adding a World File to a Map Image

Saving a Map to a Project

Loading a Map from a Project

Interacting with the User

Using Log Files

Creating a Simple Message, Warning and Error Dialog

Displaying a Progress Bar

Creating a Simple Text Input and a File Input Dialog

Creating a Combobox, Radio Buttons, Checkboxes, and a Dock Widget

Displaying a Message in the Status Bar

Pushing Messages and Widgets to the Message Bar

Creating Tabs

Stepping the User Through a Wizard

Keeping Dialogs on Top

QGIS Workflows

Creating an NDVI

Geocoding Addresses

Creating Raster Footprints

Performing Network Analysis

Routing Along Streets

Tracking a GPS

Performing Nearest Neighbor Analysis

Creating a DEM from LIDAR and Dot Density Map

Collecting Field Data

Computing Road Slope Using Elevation Data

Geolocating Photos on the Map

Image Change Detection

Adjusting Imprecise Building Footprints

Visualizing Multi-Temporal Data

Other Tips and Tricks

Creating Tiles from a QGIS Map

Adding a Layer to geojson.io

Rendering Map Layers Based on Rules

Creating a Layer-Definition File

Using NULL Values in PyQGIS

Using Generators for Layer Queries

Using Alpha Values to Show Data Density

Using the __geo_interface__ protocol

Getting the Output File Names from Processing Algorithms

Generating Points Along a Line

Using Expression-Based Labels

Calculating Length for all Selected Lines

Using a Different Status Bar CRS than the Map –

Using OpenStreetMap Points of Interest in QGIS

Visualizing Data in 3D with WebGL and on a Globe

Make a Globe-Like Azimuthal Orthographic Projection

Animating a Layer

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Chapter 3

Composing Static Map

Section 6

Adding a Custom Shape, Grid, and Table to the Map

The QGIS composer has an object for drawing and styling nonspatial shapes, including rectangles, ellipses, and triangles. In this video, we'll add some rectangles filled with different colors, which resemble a simple bar chart; then we will add grid for reference purpose. And finally add the table to the composition. - For shape: Create a simple map composition then Define the style properties and render the symbols - For grid: Create a simple map composition establish grid parameters, and style the grid - For table: Create a simple map composition then add the table and output the composition to an image

Automated GIS Workflows with PyQGIS [Video]

By : Joel Lawhead

Automated GIS Workflows with PyQGIS [Video]

By: Joel Lawhead

Overview of this book

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Automated GIS Workflows with PyQGIS [Video]