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

By Mick Thompson

Today's cellular units have GPS and conventional APIs to offer you entry to coordinates—but what are you able to do with that facts? With this concise publication, software builders how you can paintings with place information quick and simply, utilizing Node.js, CouchDB, and different open resource instruments and libraries.

Node.js makes it basic to run occasion code on the net, and the CouchDB document-oriented database permits you to shop place info and practice complicated queries on it speedy. You'll find out how to start with those instruments, after which use them jointly to construct an instance undertaking known as MapChat, utilizing HTML and JavaScript code samples.
* find out how to serve dynamic content material with Node.js, and use its asynchronous IO to deal with a number of requests immediately
* get to grips with GeoJSON, Geohash, and the Geospatial info Abstraction Library (GDAL) for operating with spatial info
* construct geospatial indexes utilizing the GeoCouch department of CouchDB
* mix those instruments to construct a venture that we could clients publish real-time chat messages tagged with their present map situation

Show description

Read or Download Getting Started with GEO, CouchDB, and Node.js PDF

Similar computing books

Open Sources: Voices from the Open Source Revolution

Submit 12 months be aware: First released January 1999

Freely to be had resource code, with contributions from millions of programmers world wide: this can be the spirit of the software program revolution referred to as Open resource. Open resource has grabbed the pc industry's awareness. Netscape has opened the resource code to Mozilla; IBM helps Apache; significant database owners haved ported their items to Linux. As agencies discover the facility of the open-source improvement version, Open resource is turning into a conceivable mainstream substitute to advertisement software.

Now in Open resources, leaders of Open resource come jointly for the 1st time to debate the hot imaginative and prescient of the software program they've got created. The essays during this quantity supply perception into how the Open resource stream works, why it succeeds, and the place it truly is going.

For programmers who've worked on open-source tasks, Open assets is the hot gospel: a robust imaginative and prescient from the movement's non secular leaders. For companies integrating open-source software program into their company, Open assets finds the mysteries of the way open improvement builds greater software program, and the way companies can leverage freely to be had software program for a aggressive enterprise advantage.

The participants the following were the leaders within the open-source arena:
Brian Behlendorf (Apache)
Kirk McKusick (Berkeley Unix)
Tim O'Reilly (Publisher, O'Reilly & Associates)
Bruce Perens (Debian venture, Open resource Initiative)
Tom Paquin and Jim Hamerly (mozilla. org, Netscape)
Eric Raymond (Open resource Initiative)
Richard Stallman (GNU, unfastened software program beginning, Emacs)
Michael Tiemann (Cygnus Solutions)
Linus Torvalds (Linux)
Paul Vixie (Bind)
Larry Wall (Perl)

This ebook explains why the vast majority of the Internet's servers use open- resource applied sciences for every little thing from the working approach to net serving and electronic mail. Key expertise items built with open-source software program have overtaken and handed the economic efforts of billion greenback businesses like Microsoft and IBM to dominate software program markets. examine the interior tale of what led Netscape to choose to liberate its resource code utilizing the open-source mode. learn the way Cygnus suggestions builds the world's top compilers by means of sharing the resource code. examine why enterprise capitalists are eagerly looking at pink Hat software program, an organization that provides its key product -- Linux -- away.

For the 1st time in print, this publication offers the tale of the open- resource phenomenon instructed through the folks who created this movement.

Open resources will convey you into the area of unfastened software program and exhibit you the revolution.

Linux Voice [UK], Issue 25 (April 2016)

Approximately Linux Voice

Linux Voice is an self sustaining GNU/Linux and unfastened software program journal from the main skilled reporters within the business.

About this issue

People try to damage into our desktops, yet we will struggle again. With honeypots and crafty, we seize attackers red-handed and discover what they're up to.

Plus: We delve into OwnCloud to determine what 2016 has in shop, percentage a espresso with crimson Hat's leader group wrangler, and peek contained in the ELF dossier structure. Get extra from your Linux computer in with our tutorials: visual display unit your health, construct 3D types, create a 3D robotic, increase your web pages and quite a bit more.

Heterogeneous Computing with Open: CL

Heterogeneous Computing with OpenCL teaches OpenCL and parallel programming for complicated platforms which could contain various machine architectures: multi-core CPUs, GPUs, and fully-integrated speeded up Processing devices (APUs) equivalent to AMD Fusion know-how. Designed to paintings on a number of structures and with broad help, OpenCL may help you extra successfully software for a heterogeneous destiny.

Computer and Computing Technologies in Agriculture VII: 7th IFIP WG 5.14 International Conference, CCTA 2013, Beijing, China, September 18-20, 2013, Revised Selected Papers, Part I

The two-volume set IFIP AICT 419 and 420 constitutes the refereed post-conference lawsuits of the seventh IFIP TC five, WG five. 14 foreign convention on laptop and Computing applied sciences in Agriculture, CCTA 2013, held in Beijing, China, in September 2013. The one hundred fifteen revised papers awarded have been conscientiously chosen from various submissions.

Extra info for Getting Started with GEO, CouchDB, and Node.js

Sample text

There are databases for this available—however they are not always accurate, especially on mobile devices. Using the built in location request in the browser is becoming more widely supported, gives a more accurate answer, and allows users to opt out of the feature if sharing their location is not something the user is comfortable allowing. Grab browser location In order to get the user’s location, the client has to check to see if the browser supports location, and if it does, register a callback function to handle the data once the user allows it and the browser has been able to locate the user.

To do this, add a static handler. ejs” in the “views” directory. io, Google Maps, and our own client JavaScript. There is also a stylesheet. The stylesheet is basic, but can be altered to change most of the application’s style. It is included in the example code for MapChat. Now the application is ready for the server to start listening for user requests. io will form the basis for messaging between the client and server in MapChat. After the connection is created, the client will make a subscription request to the server which will include the client’s current map bounds.

When a conflict on a document is detected, it is flagged as being conflicted. The automatic resolution picks a winning copy of the document (the most recent one) and saves the losing version as well. This happens consistently on both servers. If this automatic resolution is not advanced enough for the needs of the application conflicts can be resolved by the application in a why that makes sense. The application can leave the winning document in place, choose the other version that was saved to the history of the document, or create a new merged version of the document.

Download PDF sample

Rated 4.02 of 5 – based on 6 votes