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The human visual system: the user is key.

Will Schroeder et al. in The Visualisation Toolkit (Schroder et al. 1998) stated “informally visualisation is the transformation of data or information into pictures. Visualisation engages the primal human sensory apparatus, vision, as well as the processing power of the human mind. The result is a simple and effective medium for communicati ng complex and/or voluminous information.” Based upon using the massive amount of brain power within the human visual system that constitutes about 1/3 of the total brain size, visualizations have been shown to be one of the best and sometimes the only way of conveying a huge amount of data in a short period of time. One of the key reasons for visualization as a specific field to study was the rapid increase in quantity of data being produced by simulations on supercomputers of physical, natural and theoretical problems. This has been termed as the data-deluge problem and frequently has been so large that graphical representations offer the only viable way to assimilate the data.

The simulation models themselves have also been increasing in complexity, involving large numbers of independent and dependent variables whose relationships need to be understood. For example, in climate modelling, we may wish to explore how temperatures, water vapour content, pressure, wind directions and velocities vary within a 3D region, over time and all at once. The process of visualization is therefore concerned with ways to represent the data as well as defining tools for interactively exploring the multidimensional and multi-variant models. One of the early active research areas was to find ways to link this visualization process with interactive control of the simulations themselves, opening up completely new possibilities for interactive exploration and understanding of complex phenomena. Over the years a number of visualization systems have emerged, which provide a framework for this kind of model exploration.

Visualization tools: evaluating a graph

Plenty of literature and course notes are now available but as a simple example, a few rules are presented next on how to create an effective graph. A graph should present a reasonable amount of data, say something about the behaviour of that data and it should avoid giving a false impression of the data. In other words, the graph must communicate something. Tukey (1977) pp 128,157 said t here cannot be too much emphasis on our need to see behaviour. Graphs force us to note the unexpected; nothing could be more important” .

Excel and MATLAB are two of the most popular visualization tools currently used, even though users may not consider them as such. They produce numerous 2D and 3D graphs of different sizes and dimensions but the visualization choices are rarely thought about. Figure 2 shows two views using MATLAB of a simple formulae (y = (x-1) -2 + 3(x-2) -2 ). Both show the same numerical sampled data but the second, by cropping the y-axis to a limited range [0:50], could be said to present a large amount of extra information highlighting an important area. This process has been termed focus and context zoom interaction.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Research in a connected world. OpenStax CNX. Nov 22, 2009 Download for free at http://cnx.org/content/col10677/1.12
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