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OpenLayers 3.x Cookbook
OpenLayers 3.x Cookbook

OpenLayers 3.x Cookbook: This book will provide users with a variety of recipes that illustrate different features present in OpenLayers 3 , Second Edition

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Profile Icon J. Langley Profile Icon Antonio Santiago
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Full star icon Full star icon Full star icon Full star icon Empty star icon 4 (1 Ratings)
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OpenLayers 3.x Cookbook

Chapter 2. Adding Raster Layers

In this chapter we will cover the following topics:

  • 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

Introduction

Imagery is one of the most important kinds of data to work with in a GIS system. An eye-catching map with beautiful cartography can make an immediate difference to the appeal of a mapping application.

This chapter is all about working with different types of raster layers. We have tried to summarize, with a set of recipes, the most common and important use cases you can find day to day when working with OpenLayers and third-party layer providers.

OpenLayers offers several classes to integrate with different imagery providers, from proprietary providers, such as Bing Maps, and MapQuest, to open source ones, such as OpenStreetMap, and Stamen, or even any Web Map Service (WMS) service provider.

The base class for any layer type is ol.layer.Base, which offers a set of common properties and defines the common behavior for other layer classes. The ol.layer.Layer class further extends the base class with some extra methods and creates sub-classes, such as ol.layer.Tile, which we&apos...

Using Bing imagery

Bing Maps is the mapping service provided by Microsoft. OpenLayers makes integration with this tile service very easy with the class ol.source.BingMaps. We'll explore the variety of imagery Bing Maps offers.

We're going to create a map with a panel containing a list of layers you can switch between. The source code can be found in ch02/ch02-bing-maps/. We will end up with something similar to the following screenshot:

Using Bing imagery

Getting ready

Bing Maps requires you to register as a consumer user in order to access their REST tile service. Once registered, you'll be able to view your personal API key which is needed to initialize the OpenLayers Bing Maps source layer. Your API key is used to authenticate you against the Bing Maps service.

Note

You can find out how to register for an API key at https://www.bingmapsportal.com.

In addition to this, you can learn about the imagery that Bing Maps offers at https://msdn.microsoft.com/en-us/library/ff701716.aspx.

From this point...

Using OpenStreetMap imagery

OpenStreetMap (http://www.openstreetmap.org) is built by an open community of mappers who contribute and maintain geospatial data. This means that even you and I can get involved if we want to! This data is openly available to the public as long as you provide credit to OpenStreetMap and its contributors.

In earlier recipes, we only took a look at the standard layer type from OpenStreetMap, but there are many, many more layer styles that have been created on top of the OpenStreetMap data. We will show you three different OpenStreetMap sources: Humanitarian OSM, MapQuest Open, and Transport Dark OSM.

Using OpenStreetMap imagery

The preceding map shows the Transport Dark OpenStreetMap layer style from Andy Allen. The source code for this recipe can be found in ch02/ch02-openstreetmap/.

How to do it…

Let's produce this recipe using the steps outlined as follows:

  1. Create the HTML page with OpenLayers dependencies, jQuery and jQuery UI. In particular, split the page into two sections...

Adding WMS layers

Web Map Service (WMS) is a standard developed by the Open Geospatial Consortium (OGC) implemented by many geospatial servers, among which we can find the free and open source projects GeoServer (http://geoserver.org) and MapServer (http://mapserver.org). More information on WMS can be found at http://en.wikipedia.org/wiki/Web_Map_Service.

As a very basic summary, you can understand a WMS server as a normal HTTP web server that accepts requests with some GIS-related parameters (such as projection, bounding box, and so on), and returns map tiles forming a mosaic that covers the requested bounding box. Here's the finished recipe outcome using a WMS layer that covers the extent of the USA (source code can be found in ch02/ch02-wms-layers/):

Adding WMS layers

Note

We are going to work with remote WMS servers, so it is not necessary you have one installed yourself. Note that we are not responsible for these servers and that they may have problems, or may not be available any longer when you...

Changing the zoom effect

The panning and zoom effects are very important actions that are related to the user navigation experience. In Chapter 1, Web Mapping Basics, the Moving around the map view recipe shows you how you can control and animate the way the map can be panned, zoomed, and rotated.

In this recipe, we'll explore animations even further by demonstrating different ways that you can customize transition effects between two zoom levels on the layer.

By default, OpenLayers animates the zoom transitions. In order to customize this ourselves, OpenLayers comes with a series of different animation methods that are available from ol.animation object. For this recipe, we'll use the ol.animation.bounce and ol.animation.zoom methods to customize the zoom effects.

We will have a panel on the right so that you can choose the animation-easing algorithm, the duration and whether or not to use the bounce effect.

Here's a screenshot of what we'll end up with (the source code...

Changing layer opacity

When you are working with many layers, both raster and vector layers, you will probably find situations where a layer that is on top of another layer obscures the one below it. This is more common when working with raster WMS layers without the transparent property set to true or tiled layers, such as OpenStreetMaps, and Bing Maps.

In this recipe, we'll create a slider that updates the layer opacity of the topmost layer, revealing a layer underneath as the opacity is lowered. The source code can be found in ch02/ch02-layer-opacity/. Here's a screenshot showing the layer opacity at 60%:

Changing layer opacity

How to do it…

We used jQuery UI to create the slider widget. Here are the steps to create this recipe:

  1. Create an HTML file adding the required OpenLayers dependencies, as well as jQuery UI and dependencies. In particular, here's the markup for the map and opacity panels:
    <div id="js-map" class="map"></div>
    <div class="pane&quot...

Introduction


Imagery is one of the most important kinds of data to work with in a GIS system. An eye-catching map with beautiful cartography can make an immediate difference to the appeal of a mapping application.

This chapter is all about working with different types of raster layers. We have tried to summarize, with a set of recipes, the most common and important use cases you can find day to day when working with OpenLayers and third-party layer providers.

OpenLayers offers several classes to integrate with different imagery providers, from proprietary providers, such as Bing Maps, and MapQuest, to open source ones, such as OpenStreetMap, and Stamen, or even any Web Map Service (WMS) service provider.

The base class for any layer type is ol.layer.Base, which offers a set of common properties and defines the common behavior for other layer classes. The ol.layer.Layer class further extends the base class with some extra methods and creates sub-classes, such as ol.layer.Tile, which we'll frequently...

Using Bing imagery


Bing Maps is the mapping service provided by Microsoft. OpenLayers makes integration with this tile service very easy with the class ol.source.BingMaps. We'll explore the variety of imagery Bing Maps offers.

We're going to create a map with a panel containing a list of layers you can switch between. The source code can be found in ch02/ch02-bing-maps/. We will end up with something similar to the following screenshot:

Getting ready

Bing Maps requires you to register as a consumer user in order to access their REST tile service. Once registered, you'll be able to view your personal API key which is needed to initialize the OpenLayers Bing Maps source layer. Your API key is used to authenticate you against the Bing Maps service.

Note

You can find out how to register for an API key at https://www.bingmapsportal.com.

In addition to this, you can learn about the imagery that Bing Maps offers at https://msdn.microsoft.com/en-us/library/ff701716.aspx.

From this point on, it is assumed...

Using OpenStreetMap imagery


OpenStreetMap (http://www.openstreetmap.org) is built by an open community of mappers who contribute and maintain geospatial data. This means that even you and I can get involved if we want to! This data is openly available to the public as long as you provide credit to OpenStreetMap and its contributors.

In earlier recipes, we only took a look at the standard layer type from OpenStreetMap, but there are many, many more layer styles that have been created on top of the OpenStreetMap data. We will show you three different OpenStreetMap sources: Humanitarian OSM, MapQuest Open, and Transport Dark OSM.

The preceding map shows the Transport Dark OpenStreetMap layer style from Andy Allen. The source code for this recipe can be found in ch02/ch02-openstreetmap/.

How to do it…

Let's produce this recipe using the steps outlined as follows:

  1. Create the HTML page with OpenLayers dependencies, jQuery and jQuery UI. In particular, split the page into two sections for the map...

Left arrow icon Right arrow icon

Key benefits

  • Create highly customized mapping apps for the web with rich interactivity and diverse content using JavaScript
  • See how successful mapping apps work and how they integrate with third-party services
  • Packed full of code examples, screenshots, and explanations from professionals in the industry

Description

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.

Who is this book for?

If you are a GIS-related professional with basic knowledge of web technologies and want to gain in-depth knowledge of creating web mapping applications, then this book is for you. The recipes will be appropriately mixed to suit JavaScript beginners or experts and cover basic to advanced topics on OpenLayers.

What you will learn

  • Create stunning maps, and understand
  • projection
  • Add customized raster and vector layers
  • Work with important tile providers
  • Work with OGC, WMS, and WFS
  • compliant servers
  • Read/write features from/to different
  • data sources
  • Style features to improve their visualization
  • Understand events and work with the
  • main controls
  • Enhance maps with HTML5 technologies
  • such as Geolocation
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Table of Contents

8 Chapters
1. Web Mapping Basics Chevron down icon Chevron up icon
2. Adding Raster Layers Chevron down icon Chevron up icon
3. Working with Vector Layers Chevron down icon Chevron up icon
4. Working with Events Chevron down icon Chevron up icon
5. Adding Controls Chevron down icon Chevron up icon
6. Styling Features Chevron down icon Chevron up icon
7. Beyond the Basics Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
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4 star 100%
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1 star 0%
Jorge Arévalo Jun 19, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
I was given this book to review, as I am a software developer with a GIS background. So, I spent a respectable amount of time with it.First thing I need to say is I love the cookbook approach for books like this one: focused on a library. I want to know how to do things with this version of the library. Period. And this books contains a lot of useful recipes. So, it fullfills its promise.The 3 first chapters are pretty basic, in my opinion. Good for beginners. Chapters 4 and 5 are more complex, and will keep you really busy. Chapter 6 is all about styling. Very comprehensive, but I prefer a different approach for styling my maps (CartoCSS, for example: separate style from code. CartoDB and Mapbox allow this). Chapter 7 contains a few cool tricks I didn't know about, and leaves you hungry for more recipes.One thing that bothers me a bit is the lack of live links to jsfiddle/plnkr versions of the recipes. It would be great to read the book while having a running version of the recipes. But maybe the idea is to make you write the recipes by yourself. So, just a matter of personal opinion.If you're new to OL3, I think this book is perfect to make you productive in short time. But if you worked with OL3 before, you can probably skip chapters 01 to 03, and start with chapter 04.Anyway, I think you can find interesting recipes here, regardless of your previous experience with OL3. Good book.
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