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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

4.2 (9)
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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

4.2 (9)
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Overview of this book

Table of Contents (18 chapters)
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OpenLayers 2.10
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OpenLayers 2.10
Credits
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Credits
About the Author
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About the Author
About the Reviewers
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About the Reviewers
www.PacktPub.com
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www.PacktPub.com
Preface
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Preface
Free Chapter
1
Getting Started with OpenLayers
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Getting Started with OpenLayers
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What is OpenLayers?
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What, technically, is OpenLayers?
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Anatomy of a web-mapping application
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Relation to Google / Yahoo! / and other mapping APIs
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The OpenLayers website
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Time for action – downloading OpenLayers
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Time for action – creating your first map
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How the code works
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Behind the scenes—Object Oriented Programming (OOP)
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Time for Action – play MadLibs
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Now what?
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Where to go for help
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OpenLayers source code repository
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Summary
2
Squashing Bugs With Firebug
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Squashing Bugs With Firebug
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What is Firebug?
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Setting up Firebug
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Time for Action – downloading Firebug
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Firebug controls
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Panel conclusion
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Using the Console panel
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Time for Action – executing code in the Console
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Time for Action – creating object literals
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Time for Action – interacting with a map
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Summary
3
The 'Layers' in OpenLayers
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The 'Layers' in OpenLayers
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What's a layer?
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Layers in OpenLayers
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Time for Action – creating a map with multiple layers
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Creating layer objects
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Time for Action – configuring the options parameter
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Configuring layer options
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Map tiles
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Available layer properties
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The OpenLayers.Layer class
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Other layer types
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Time for Action – creating a Google Maps layer
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Time for Action – using the image layer
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Accessing layer objects
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Time for Action – accessing map.layers
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Time for Action – accessing layer objects in Firebug
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Layer class methods
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Time for Action – defining a global layer object variable
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Summary
4
Wrapping Our Heads Around Projections
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Wrapping Our Heads Around Projections
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Map projections
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Time for Action – using different projection codes
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Time for Action – determining LonLat coordinates
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OpenLayers projection class
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Transforming projections
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Time for Action – coordinate transforms
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Time for Action – setting up Proj4js.org
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Summary
5
Interacting with Third Party APIs
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Interacting with Third Party APIs
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Third party mapping APIs
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Google Maps
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Time for Action – using Goole Maps V3 (standard way)
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Time for Action – creating a Google Map layer with V2 (Deprecated)
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Yahoo! Maps API
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Time for Action – using the Yahoo! Maps Layer
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Microsoft's mapping API
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Time for Action – creating a Bing/Virtual Earth Layer
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OpenStreetMap
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Time for Action – creating an OpenStreetMap Layer
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Spherical Mercator
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Time for Action – using Spherical Mercator
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Using Google Maps and other layers
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Time For Action – creating your first mashup
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Summary
6
Taking Control of Controls
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Taking Control of Controls
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What are controls?
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Adding controls to your map
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Time for Action – creating a map with no controls
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Time for Action – adding controls to a map
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OpenLayers.Control class
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OpenLayers.Control subclasses
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Time for Action – using attributions
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Time for Action – using the NavigationHistory control
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Panels
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Time for Action – using Panels
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Creating our own controls
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Creating a custom button
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Time for Action – creating a simple button
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Events
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Time for Action – creating a custom TYPE_TOGGLE control
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Summary
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Styling Controls
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Styling Controls
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What is CSS?
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Time for Action – using external CSS files
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OpenLayers and CSS
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Time for Action – styling controls
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Time for Action – styling the LayerSwitcher control
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Other resources
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Summary
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Charting the Map Class
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Charting the Map Class
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The Map class
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Map class properties
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Time for Action – using the allOverlays Map property
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Time for Action – setting zoom levels and maxExtent
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Time for Action – using resolutions array
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Time for Action – using Min and Max resolution
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Time for Action – Using scales
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Time for Action – working with Pan animations
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Map functions
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Time for Action – using control methods
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Time for Action – using coordinate related functions
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Doing stuff with events
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Time for Action – using eventListeners
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Time for Action – working with Map events
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Multiple maps
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Time for Action – using multiple map objects
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Time for Action – creating a multiple map and custom event application
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Summary
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Using Vector Layers
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Using Vector Layers
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What is the Vector Layer?
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Time for Action – creating a Vector Layer
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How the Vector Layer works
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Time for Action – changing the Renderers array
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Vector Layer class
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Time for Action – adding features
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Time for Action – destroying features
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Time For Action – working with feature events
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Vector Layer class events
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Time For Action – using Vector Layer events
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Time For Actions – working with more events
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Geometry and Feature classes
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Time for Action – using Geometry class methods
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Time For Action – using the SelectFeature control
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The Vector class, part two
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Time for Action – creating a Vector Layer
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Using the Vector Layer without a Protocol class
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Time for Action – using the Format and Strategy classes alone
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Format class
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Strategy class
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Summary
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Vector Layer Style Guide
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Vector Layer Style Guide
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Styling the Vector Layer
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Time For Action – applying some basic Styling
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The StyleMap class
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The Style class
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Time for Action – common style examples
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Attribute replacement
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Time For Action – working with attribute replacement
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Rules and filters
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Time For Action – using addUniqueValueRules
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Rules and filters
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Time for Action – using rules and filters
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OpenLayers.Rule class
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OpenLayers.Filter class
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Time For Action – figuring out logical filters
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Summary
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Making Web Map Apps
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Making Web Map Apps
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Development strategies
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Creating a web map application using Flickr
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Time For Action – getting Flickr data
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Time for Action – adding data to your map
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Time for Action – extract style
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Turning our example into an application
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Time for Action – adding some interactivity
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Using real time data with a ProxyHost
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Time for Action – getting dynamic data
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Wrapping up the application
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Time For Action – adding dynamic tags to your map
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Deploying an application
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Building the OpenLayers Library file
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Time for Action – building a Config file
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Time for Action – running the Build script
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Summary
Index
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Index

Creating layer objects

The process to work with layers consists of two steps:

  1. Create the layer object.

  2. Add the layer object to the map. You can use either map.addLayer(layer) to add an individual layer, or map.addLayers([layer1, layer2, ...]) to add an array of layers, like in the previous example.

These two steps can actually be combined into one step (by instantiating the layer object when calling the addLayer function—this works, but I don't recommend it as it makes it a little harder to work with the layer object). By now, we have a bit of experience instantiating objects from the WMS Layer class. Let's take a look at the code that creates our wms_base layer object.

var wms_layer_map = new OpenLayers.Layer.WMS(
  'Base layer',
  'http://vmap0.tiles.osgeo.org/wms/vmap0',
  {layers: 'basic'},
  {isBaseLayer: true}
);

Each item inside the parentheses, after OpenLayers.Layer.WMS(, are called arguments which we pass in while creating the object. But how did I know what arguments to pass in?

We...

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