3. Working with Layers | Mastering OpenLayers 3

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Mastering OpenLayers 3

By : Farkas

4.7 (3)

Mastering OpenLayers 3

4.7 (3)

By: Farkas

Overview of this book

OpenLayers 3 allows you to create stunning web mapping and WebGIS applications. It uses modern, cutting edge browser technologies. It is written with Closure Library, enabling you to build browser-independent applications without painful debugging ceremonies, which even have some limited fallback options for older browsers. With this guide, you will be introduced to the world of advanced web mapping and WebGIS. First, you will be introduced to the advanced features and functionalities available in OpenLayers 3. Next, you will be taken through the key points of creating custom applications with OpenLayers 3. You will then learn how to create the web mapping application of yours (or your company's) dream with this open source, expense-free, yet very powerful library. We’ll also show you how to make amazing looking thematic maps and create great effects with canvas manipulation. By the end of this book, you will have a strong command of web mapping and will be well on your way to creating amazing applications using OpenLayers 3.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Creating Simple Maps with OpenLayers 3

1. Creating Simple Maps with OpenLayers 3

Before getting started

Structure of OpenLayers 3

Building the layout

Using the API documentation

Debugging the code

Summary

2. Applying Custom Styles

2. Applying Custom Styles

Before getting started

Customizing the default appearance

Styling vector layers

Customizing the appearance with JavaScript

Creating a WebGIS client layout

Summary

3. Working with Layers

3. Working with Layers

Before getting started

Building a layer tree

Adding layers dynamically

Adding vector layers with the File API

Adding vector layers with a library

Removing layers dynamically

Changing layer attributes

Changing the layer order with the Drag and Drop API

Clearing the message bar

Summary

4. Using Vector Data

4. Using Vector Data

Before getting started

Accessing attributes

Setting attributes

Validating attributes

Creating thematic layers

Saving vector data

Saving with WFS-T

Modifying the geometry

Summary

5. Creating Responsive Applications with Interactions and Controls

5. Creating Responsive Applications with Interactions and Controls

Before getting started

Building the toolbar

Mapping interactions to controls

Building a set of feature selection controls

Adding new vector layers

Building a set of drawing tools

Modifying and snapping to features

Creating new interactions

Building a measuring control

Summary

6. Controlling the Map – View and Projection

6. Controlling the Map – View and Projection

Before getting started

Customizing a view

Constraining a view

Creating a navigation history

Working with extents

Rotating a view

Changing the map's projection

Creating custom animations

Summary

7. Mastering Renderers

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

Creating a convolution matrix

Clipping a layer with WebGL

Summary

8. OpenLayers 3 for Mobile

8. OpenLayers 3 for Mobile

Before getting started

Responsive styling with CSS

Generating geocaches

Adding device-dependent controls

Vectorizing the mobile version

Making the mobile application interactive

Summary

9. Tools of the Trade – Integrating Third-Party Applications

9. Tools of the Trade – Integrating Third-Party Applications

Before getting started

Exporting a QGIS project

Importing shapefiles

Spatial analysis with Turf

Spatial analysis with JSTS

3D rendering with Cesium

Summary

10. Compiling Custom Builds with Closure

10. Compiling Custom Builds with Closure

Before getting started

Configuring Node JS

Compiling OpenLayers 3

Bundling an application with OpenLayers 3

Extending OpenLayers 3

Creating rich documentation with JSDoc

Summary

Index

Index

Building a layer tree

If you look up the examples for this chapter, you will see some files with the ch03_layertree prefix. These files contain the first example. In this example, we will build the base of our layer tree and add the two layers from the previous example to it. First, take a look at the HTML file. We only add one single div element to the map, which we will dynamically fill with content:

    [...]
    <div id="layertree" class="layertree"></div>
    <div id="map" class="map">
    [...]

Styling the layer tree

In the next step, we will style the content of the layer tree with CSS. If you look at the CSS file for the example, you can see that there are quite a lot declarations in it. First, we will create some rules for the whole element:

.layertree {
    width: 20%;
    height: calc(100% - 3.5em);
    float: left;
    [...]
}

Tip

In spite of not showing the full HTML and CSS code here, in order to preserve valuable space, you must use the full versions from the example...

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