Gabor Farkas-Mastering OpenLayers 3.pdf

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Cover

Credits

About the Author

About the Reviewer

www.PacktPub.com

Table of Contents

Preface

Chapter 1: Creating Simple Maps with OpenLayers 3

Before getting started

Creating a working environment

Structure of OpenLayers 3

Building the layout

Creating the appeal

Writing the code

Using the API documentation

Understanding type definitions

Debugging the code

Summary

Chapter 2: Applying Custom Styles

Before getting started

Basic considerations

Customizing the default appearance

Identifying the classes

Styling the controls

Customizing the attribution control

Creating a custom zoom control with CSS

Styling vector layers

Customizing the appearance with JavaScript

Changing the overview map and the scale bar

Truncating the coordinate control

Changing the attribution

Creating a WebGIS client layout

Building the HTML

Styling the layout

Writing the code

Summary

Chapter 3: Working with Layers

Before getting started

Using a proxy

Resources to use

Basic considerations

Building a layer tree

Styling the layer tree

Creating a layer tree constructor

Adding layers dynamically

Creating the interface

Extending the constructor

Fetching the WMS metadata

Adding WMS layers

Adding WFS layers

WFS considerations

Adding vector layers with the File API

Creating the interface

Building the method

Adding vector layers with a library

Removing layers dynamically

Extending a constructor

Changing layer attributes

Styling active layers

Extending the method

Changing the layer order with the Drag and Drop API

Clearing the message bar

Summary

Chapter 4: Using Vector Data

Before getting started

Accessing attributes

Writing the code

Setting attributes

Styling the form

Writing the code

Validating attributes

Adjusting the styles

Building headers

Writing the code

Creating thematic layers

Extending the layer tree

Creating choropleth maps

Creating categorized maps

Saving vector data

Saving in arbitrary formats

Saving with WFS-T

Modifying the geometry

Summary

Chapter 5: Creating Responsive Applications with Interactions and Controls

Before getting started

Basic considerations

Building the toolbar

Mapping interactions to controls

Creating the control

Adding and removing the control

Adding a selection control

Building a set of feature selection controls

Styling the controls

Creating the selection tools

Adding new vector layers

Creating the HTML and the CSS

Extending the layer tree

Building a set of drawing tools

Writing the method

Modifying and snapping to features

Extending the method

Creating new interactions

Understanding ol.interaction.Pointer

Removing features

Dragging features

Extending the method

Building a measuring control

Creating the interaction

Doing geodesic measurements

Calculating lengths even more precisely

Summary

Chapter 6: Controlling the Map – View and Projection

Before getting started

Basic considerations

Customizing a view

Constraining a view

Creating a navigation history

Working with extents

Creating a zoom control

Extending the toolbar

Rotating a view

Changing the map's projection

Creating custom animations

Building the control

Creating animations

Summary

Chapter 7: Mastering Renderers

Before getting started

Using different renderers

Creating a WebGL map

Drawing lines and polygons with WebGL

Blending layers

Clipping layers

Exporting a map

Creating a raster calculator

Raster 101

Operating with pixels

Creating a convolution matrix

How convolution works

Converting an image to 8-bit

Implementing the Sobel filter

Normalizing an image

Finalizing a control

Clipping a layer with WebGL

Writing programs

Creating a clipping mask

Summary

Chapter 8: OpenLayers 3 for Mobile

Before getting started

Basic considerations

Responsive styling with CSS

Writing the style sheet

Constructing the map

Generating geocaches

Adding device-dependent controls

Adding controls for touch devices

Adding controls for desktop computers

Vectorizing the mobile version

Making the mobile application interactive

Summary

Chapter 9: Tools of the Trade: Integrating Third-Party Applications

Before getting started

Exporting a QGIS project

Installing the qgis2web plugin

Inspecting the project

Exporting a map

Salvaging the results

Importing shapefiles

Editing the HTML file

Replacing a function

Spatial analysis with Turf

Preparing an example

Implementing a buffer operation

Implementing a merge operation

Implementing the self-intersect operation

Spatial analysis with JSTS

Implementing operations

3D rendering with Cesium

Preparing a map

Creating a control

Observing a terrain

Extending the Cesium scene

Summary

Chapter 10: Compiling Custom Builds with Closure

Before getting started

Configuring Node JS

Installing Node JS on Windows

Installing Node JS on Linux

Resolving dependencies

Compiling OpenLayers 3

Building default versions

Understanding a configuration file

Building OpenLayers 3 with a subset of features

Bundling an application with OpenLayers 3

Editing the application

Creating a configuration file

Fixing the application

Extending OpenLayers 3

Creating rich documentation with JSDoc

Customizing the documentation

Summary

Index

[ 1 ]

Mastering OpenLayers 3 Create powerful applications with the most robust open source web mapping library using this advanced guide Gábor Farkas BIRMINGHAM - MUMBAI

Mastering OpenLayers 3 Copyright © 2016 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: January 2016 Production reference: 1220116 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78528-100-6 www.packtpub.com

Credits Author Gábor Farkas Reviewer Jose Troche Project Coordinator Bijal Patel Proofreader Safis Editing Commissioning Editor Veena Pagare Indexer Monica Ajmera Mehta Acquisition Editor Sonali Vernekar Graphics Disha Haria Content Development Editor Production Coordinator Anish Dhurat Conidon Miranda Technical Editor Jayesh Sonawane Cover Work Conidon Miranda Copy Editors Sonia Cheema Trishya Hajare

About the Author Gábor Farkas is a PhD student at University of Pécs's Institute of Geography. He holds a master's degree in geography, although he moved from traditional geography to pure Geoinformatics early in his academic journey. He often studies Geoinformatical solutions in his free time, keeps up with the latest trends, and is an open source enthusiast. He loves to work with GRASS GIS, PostGIS, and QGIS, but his all-time favorites are open source web mapping technologies, which mostly cover his main areas of research interest. There have been many kind-hearted and nice people in my life who have helped me in my career or private life by giving me great advice. However, there is one significant person who has made this book possible. I would like to dedicate this book to my advisor, Titusz Bugya, who gave me the tip of starting a blog about WebGIS in English. This blog eventually led to the writing of this book. So, thanks Titusz; this book is partially the result of your trust and effort.

About the Reviewer Jose Troche is a seasoned software development engineer with over a decade of hands-on experience in architecting and building enterprise web applications in multitiered environments. He has developed web-based applications that are capable of creating, storing, searching, retrieving, real-time sharing, and tracking geospatial data. He has also created REST APIs for advanced geospatial web services that are deployed to large-scale enterprise cloud architectures. He has integrated OpenLayers into several of his projects. Jose has also worked as a contractor in aerospace and defense companies and agencies such as NASA, Lockheed Martin and General Dynamics; he is currently employed by Amazon Inc.

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Table of Contents Preface Chapter 1: Creating Simple Maps with OpenLayers 3 Before getting started Creating a working environment Structure of OpenLayers 3 Building the layout Creating the appeal Writing the code Using the API documentation Understanding type definitions Debugging the code Summary Chapter 2: Applying Custom Styles Before getting started Basic considerations Customizing the default appearance Identifying the classes Styling the controls Customizing the attribution control Creating a custom zoom control with CSS Styling vector layers Customizing the appearance with JavaScript Changing the overview map and the scale bar Truncating the coordinate control Changing the attribution [ i ] vii 1 2 2 3 4 5 6 9 10 11 12 13 13 14 14 15 15 18 19 22 24 24 25 26

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