<< Chapter < Page Chapter >> Page >

Technically speaking, HyperCities is a generalizable, easily scalable data model for linking together and publishing geo-temporal content using a unified front-end delivery system and a distributed back-end architecture. HyperCities consists of a geo-temporal markup server and a front-end visualization platform built on the Google Maps/Earth APIs that enable users to explore, manipulate, and contribute to any geographically aware environment. At its core are databases of openly accessible, geo-temporal content defined by KML, a mark-up language chosen because its development is funded by private enterprise (Google) but governed by the Open Geospatial Consortium, which ensures a robust user-base and an open-source development model for specification and implementation. (External Link)   HyperCities generates real-time, KML-based network links connected to geo-temporal content, offering a non-exclusive front-end for contributing to, organizing, and exploring independent repositories. While HyperCities hosts and stores some data locally, it is important to underscore that a central aim of the project is to host metadata connections to content stored and maintained in external repositories and on external servers. These servers range from commercially available platforms (such as Google's 3D warehouse, YouTube and Flickr) to library and archival platforms for maps, oral histories, videos, photograph collections, and other media files.  In this way, HyperCities provides the connective tissue for the community of geo-spatial time travelers by leveraging the extensive development of data repositories and social networks. HyperCities is not a "walled garden"; rather, it is an aggregation and integration platform built to facilitate interoperable, shareable, and embeddable archival objects that are connected though network links and real-time KML feeds.

The HyperCities system architecture follows one of the central trends often identified as Web 2.0: The front-end is almost entirely separated from its back-end, without following the standard model-view-controller architecture frequently used by web applications. Although a web-based platform, HyperCities behaves more like a desktop application because the front-end follows an event-driven programming model rather than a standard webpage submission model. The front-end is written entirely in Javascript/AJAX and makes extensive use of complex event processing and dynamically-generated User Interface components (rather than prewritten HTML). At its core, the HyperCities platform is a collaboration of web services, compiling a combination of digital content from disparate sources through the use of XML/KML and Javascript.  The Google Maps/Earth APIs define a set of JavaScript objects and methods that HyperCities utilizes to put maps on its interface, allowing instant integration of satellite imagery with other layers such as markers, pathways, images, historical maps, 3D objects, and other kinds of data. 

When a user first visits Hypercities, what is shown is a general Google Map zoomed out to show the world with the "historical cities" featured in HyperCities. Each time the user moves the map (zooms in, pans, jumps to a new city) or adjusts the time-bar, the application interacts with one or more external servers without reloading the entire page; instead, only the relevant data (based on spatial and temporal bounding coordinates as well as pre-defined user privileges/permissions) is displayed while the front-end maintains its own state. The server back-end (written in PHP and running off a MySQL database) is limited to pulling new data to display and input any changes a user might make to the objects being displayed. The front-end is almost a complete application itself because it contains all the display logic. This means that it is not only fairly easy to use HyperCities with different data sources, but it is also possible to pull the data from the back-end into any geographically aware environment.

Questions & Answers

An investment account was opened with an initial deposit of $9,600 and earns 7.4% interest, compounded continuously. How much will the account be worth after 15 years?
Kala Reply
lim x to infinity e^1-e^-1/log(1+x)
given eccentricity and a point find the equiation
Moses Reply
12, 17, 22.... 25th term
Alexandra Reply
12, 17, 22.... 25th term
College algebra is really hard?
Shirleen Reply
Absolutely, for me. My problems with math started in First grade...involving a nun Sister Anastasia, bad vision, talking & getting expelled from Catholic school. When it comes to math I just can't focus and all I can hear is our family silverware banging and clanging on the pink Formica table.
find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Online humanities scholarship: the shape of things to come. OpenStax CNX. May 08, 2010 Download for free at http://cnx.org/content/col11199/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Online humanities scholarship: the shape of things to come' conversation and receive update notifications?