Book Image

OpenLayers 3.x Cookbook - Second Edition

By : J. Langley, Antonio Santiago
Book Image

OpenLayers 3.x Cookbook - Second Edition

By: J. Langley, Antonio Santiago

Overview of this book

OpenLayers 3 is one of the most important and complete open source JavaScript mapping libraries today. Throughout this book, you will go through recipes that expose various features of OpenLayers 3, allowing you to gain an insight into building complex GIS web applications. You will get to grips with the basics of creating a map with common functionality and quickly advance to more complicated solutions that address modern challenges. You will explore into maps, raster and vector layers, and styling in depth. This book also includes problem solving and how-to recipes for the most common and important tasks.

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OpenLayers 3.x Cookbook - Second Edition
J. Langley | Antonio Santiago
Mar, 2016 | 304 pages
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Table of Contents (9 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Sections
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Web Mapping Basics
1. Web Mapping Basics
Introduction
Creating a simple fullscreen map
Playing with the map's options
Managing the map's stack layers
Managing the map's controls
Moving around the map view
Restricting the map's extent
2
2. Adding Raster Layers
2. Adding Raster Layers
Introduction
Using Bing imagery
Using OpenStreetMap imagery
Adding WMS layers
Changing the zoom effect
Changing layer opacity
Buffering the layer data to improve map navigation
Creating an image layer
Setting the tile size in WMS layers
3
3. Working with Vector Layers
3. Working with Vector Layers
Introduction
Adding a GML layer
Adding a KML layer
Creating features programmatically
Exporting features as GeoJSON
Reading and creating features from a WKT
Using point features as markers
Removing or cloning features using overlays
Zooming to the extent of a layer
Adding text labels to geometry points
Adding features from a WFS server
Using the cluster strategy
Reading features directly using AJAX
Creating a heat map
4
4. Working with Events
4. Working with Events
Introduction
Creating a side-by-side map comparator
Implementing a work-in-progress indicator for map layers
Listening for the vector layer features' events
Listening for mouse or touch events
Using the keyboard to pan or zoom
5
5. Adding Controls
5. Adding Controls
Introduction
Adding and removing controls
Working with geolocation
Placing controls outside the map
Drawing features across multiple vector layers
Modifying features
Measuring distances and areas
Getting feature information from a data source
Getting information from a WMS server
6
6. Styling Features
6. Styling Features
Introduction
Styling layers
Styling features based on geometry type
Styling based on feature attributes
Styling interaction render intents
Styling clustered features
7
7. Beyond the Basics
7. Beyond the Basics
Introduction
Working with projections
Creating a custom control
Selecting features by dragging out a selection area
Transitioning between weather forecast imagery
Using the custom OpenLayers library build
Drawing in freehand mode
Modifying layer appearance
Adding features to the vector layer by dragging and dropping them
Making use of map permalinks
8
Index
Index

Transitioning between weather forecast imagery

When working with geographic information, its geometrical representation in space is not the only important thing. There's also the dimension of time that we can take into account. People are increasingly interested in up-to-date information or data based around particular moments in time.

This way, visualizations can show us how data changes over time: city population, disease outbreaks, weather forecasts, and so on.

In this recipe, we're going to show you how we can create an animation on the client side by transitioning between weather forecasts at different times of the day.

We're going to use a WMTS service from the Met Office (http://www.metoffice.gov.uk), showing the rain evolution at different time instants (as shown in the following screenshot), and we will create an animation by making the previous forecast fade away and the new one fade in. The time of day that the visualization represents will be displayed at the top-right of the map...

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