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Thompson - Getting Started with GEO, CouchDB, and Node.js

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Thompson Getting Started with GEO, CouchDB, and Node.js
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Getting Started with GEO, CouchDB, and Node.js: summary, description and annotation

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Todays mobile devices have GPS and standard APIs to give you access to coordinates--but what can you do with that data? With this concise book, application developers learn how to work with location data quickly and easily, using Node.js, CouchDB, and other open source tools and libraries. Node.js makes it simple to run event code on the Web, and the CouchDB document-oriented database lets you store location data and perform complex queries on it quickly. Youll learn how to get started with these tools, and then use them together to build an example project called MapChat, using HTML and JavaS. Read more...
Abstract: Todays mobile devices have GPS and standard APIs to give you access to coordinates - but what can you do with that data? With this concise book, application developers learn how to work with location data quickly and easily, using Node.js, CouchDB, and other open source tools and libraries. Read more...

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Getting Started with GEO, CouchDB, and Node.js
Mick Thompson
Published by OReilly Media

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Preface

Where. Whether it refers to where you have been, where you are, or where you are going, the concept of where is important. Where links data to the physical world. A shopping list can be a very useful collection of data on its own, but that data can be even more useful with more context. If you map the location of the stores needed for each item on the shopping list, then you can create an efficient route to acquire the items on the list. Driving directions, traffic information, and weather can impact the route. All of this data can be fetched based on the location data added to the simple shopping list.

Location can add a new filter or layer of insight into existing data. It makes all kinds of new applications possible. In the past, using location or geographic data meant using complex or at times expensive software. Datasets could be costly or hard to find. Developing using open source tools such as Node.js and CouchDB has recently made working with location data simple and fast.

Conventions Used in This Book

The following typographical conventions are used in this book:

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Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.

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Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Getting Started with GEO, CouchDB, and Node.js by Mick Thompson (OReilly). Copyright 2011 David Thompson, 978-1-449-30752-3.

If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .

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Chapter 1. Node.js

Node.js has quickly become a very popular asynchronous framework for JavaScript. It is built on top of the same V8 engine that the Chromium and Google Chrome web browsers use to interpret JavaScript. With the addition of networking and file system API support, it has quickly proved to be a capable tool for interacting with IO in a asynchronous way.

There are many other libraries in several other languages that can accomplish the same asynchronous handling of IO. There are different conventions, schools of thought, and preferences of developers. Node.js uses callbacks for the developer to notified of the progress of asynchronous operations. Callbacks are nothing new for developers accustom to Pythons Twisted library or other similar frameworks. Callbacks can be a very easy and powerful way to manage the flow of an appilication, but as with anything new they also offer an opportunity to trip up a developer. The first thing to keep in mind when getting started with asynchronous development is that execution might not follow the same squence every time.

Getting Started with Node.js

In order to install Node.js, download the source and build it. The main Node.js web page at http://nodejs.org can be very helpful in linking to downloads, source code repositories, and documentation. The master branch of the repository is kept in a semi-unstable state, so before building check out the most recent tagged version. For example: v0.4.9.

Note

The Node.js package manager or NPM is an extremely useful tool. It can handle installing, updating, and removing packages and their dependencies. Creating packages is also simple since the configuration for the package is contained in the package.json file. Installation instructions for NPM are included in the Node.js repository.

Asynchronous Callbacks

An Example case to show how asynchronous IO works is to make two HTTP requests and then combine the results. In the first example the request to the second web API will be nested in the callback from the first. This might seem like the easiest way to combine the results, but will not be the most effective usage of asynchronous IO.

Google provides an API that returns the elevation for a given latitude and longitude. The example requests will be of two points random points on Earth. To start create a function that will handles the request to the Google elevation API as well as parses the response:

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