Google Maps JavaScript API Cookbook

Google Maps JavaScript API Cookbook

Overview of this book

Day by day, the use of location data is becoming more and more popular, and Google is one of the main game changers in this area. The Google Maps JavaScript API is one of the most functional and robust mapping APIs used among Geo developers. With Google Maps, you can build location-based apps, maps for mobile apps, visualize geospatial data, and customize your own maps.Google Maps JavaScript API Cookbook is a practical, hands-on guide that provides you with a number of clear, step-by-step recipes that will help you to unleash the capabilities of the Google Maps JavaScript API in conjunction with open source or commercial GIS servers and services through a number of practical examples of real world scenarios. This book begins by covering the essentials of including simple maps for Web and mobile, adding vector and raster layers, styling your own base maps, creating your own controls and responding to events, and including your own events.You will learn how to integrate open source or commercial GIS servers and services including ArcGIS Server, GeoServer, CartoDB, Fusion Tables, and Google Maps Engine with the Google Maps JavaScript API. You will also extend the Google Maps JavaScript API to push its capabilities to the limit with additional libraries and services including geometry, AdSense, geocoding, directions, and StreetView.This book covers everything you need to know about creating a web map or GIS applications using the Google Maps JavaScript API on multiple platforms.

Google Maps JavaScript API Cookbook

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Google Maps JavaScript API Basics

Introduction

Creating a simple map in a custom DIV element

Creating a simple fullscreen map

Moving from the Web to mobile devices

Changing map properties programmatically

Changing base maps

Adding Raster Layers

Introduction

Styling of Google base maps

Using different tile sources as base maps

Adding tile overlays to maps

Adding image overlays to maps

Changing the transparency of overlays

Creating a heat map

Adding the traffic layer

Adding the transit layer

Adding the bicycling layer

Adding the weather and cloud layers

Adding the Panoramio layer

Adding Vector Layers

Introduction

Adding markers to maps

Adding popups to markers or maps

Adding lines to maps

Adding polygons to maps

Adding circles/rectangles to maps

Adding animated lines to maps

Adding KML/GeoRSS layers

Adding GeoJSON to the Google Maps JavaScript API

Adding WKT to the Google Maps JavaScript API

Working with Controls

Introduction

Adding and removing controls

Changing the position of controls

Creating and adding a geolocation control

Creating a table of contents control for layers

Adding your own logo as a control

Understanding Google Maps JavaScript API Events

Introduction

Creating two synced maps side by side

Getting the coordinates of a mouse click

Creating a context menu on a map

Restricting the map extent

Creating a control that shows coordinates

Creating your own events

Google Maps JavaScript Libraries

Introduction

Drawing shapes on the map

Calculating the length/area of polylines and polygons

Encoding coordinates

Searching for and showing nearby places

Finding places with the autocomplete option

Adding drag zoom to the map

Creating custom popups/infoboxes

Working with Services

Introduction

Finding coordinates for an address

Finding addresses on a map with a click

Getting elevations on a map with a click

Creating a distance matrix for the given locations

Getting directions for the given locations

Adding Street View to your maps

Mastering the Google Maps JavaScript API through Advanced Recipes

Introduction

Adding WMS layers to maps

Adding Fusion Tables layers to maps

Adding CartoDB layers to maps

Accessing ArcGIS Server with the Google Maps JavaScript API

Accessing GeoServer with the Google Maps JavaScript API

Index

Customer Reviews

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Encoding coordinates

The polylines and polygons that you draw using the Google Maps JavaScript API consist of arrays of LatLng objects in latitude and longitude pairs.

The length of these arrays increases substantially, especially when you have shapes with too many nodes, in the case of long polylines or polygons that have too much detail.

Dealing with these arrays (that can be retrieved by the getPath() methods of polylines and polygons) is a major problem, especially when you have to save the shape to a DB. Serializing and deserializing lengthy arrays is frequently hulky.

However, you can compress the paths of the shapes with Google's polyline encoding algorithm.

Note

Detailed information on Google's polyline encoding algorithm

You can find detailed information about the polyline encoding algorithm at the following link:

https://developers.google.com/maps/documentation/utilities/polylinealgorithm

By using the geometry library, you can encode and decode the paths of polylines and polygons...

Google Maps JavaScript API Cookbook

Google Maps JavaScript API Cookbook

Overview of this book

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Google Maps JavaScript API Cookbook

Encoding coordinates

Note