Visualization Interview Preparation Guide

Download PDF

What do you mean by the term visualization? How does computer graphics helps in visualization?
Name few of the fields that are heavily dependent on visualization.
Data visualizations have been there for decades, but in near past IT industries have had a great impact on them, how? What is the significance of IT industries over visualization?
Can you name some of the downsides of Visualization?
Give few examples of Visualization tools that are available in the market.

Give the references of few real life scenarios in which visualization play important role.
How does visualization amplifies cognition?
Differentiate Data Visualization with Statistical Graphics.
What are various types of information visualization techniques?
Draw the flowchart of visualization stages.

Name few of the subfields of Visualization.
How would you differentiate visualization with a data-based infographics?
Name few of the primitive form graphical data representation.
What is a tag cloud? How do bloggers use them to present their information?
Is it possible to have Dynamic Visualizations? If yes, then frame a scenario in which dynamic visualization would be a better option than other counterpart.

How visualization can be a boon in education sector?
Give two ways Information visualization improves coginition.
What kind of rich compelling visualizations would be suitable for representing trends of a country’s population?
Is it possible that visualization might have user interactions as well in it? In which scenarios we can employ user interactions in addition to visual representation of data.
What is common way of visually representing multivariate datasets?

Explain briefly basic elements of a graph. How can it be visualized?
List and give examples of the Wehrend & Lewis eleven basic actions in visualization environments.
Can give few examples of applications which allow zooming while maintaining context.
What are the fundamental problems faced by the applications providing zooming capabilities?
Pour some light over pre-attentive processing.

What are the ways for solving problem of occlusion while drawing edges of a map or a graph?
What is the main yet to be solved problem that always haunt people in the field of information visualization?
What are the trends expected in the field of information visualization in near future?
What is data mining? How it is different from information visualization?
What do you understand by mindmaps?

What is scientific visualization? How it is different from other visualization techniques?
What is flow visualization? How it is different from volume visualization?
Semiotics of graphics plays important role in visualization. How?
Can you pour some light over Gibson’s Affordance theory?
What is the concept of data suppression?

What are the capabilities of adobe’s Flex Framework? How can we use it for creating rich visualizations?
What are hyperbolic tree views? How they are used in visual representation of data?
Mention few advantages & disadvantages of treemaps method of visualization.
What do you understand by magic lens technique? How it is used for information visualization?
What is document visualization? What are common issues in it?

List few methods to solve problem of data overflow from the screen.
What are chernoff faces & how they are useful in information visualization?
There are three types of variable we use in information visualization. What are they? Explain them.
Scatterplot matrices are widely used in field of information visualization. What kind of data do it represent?
What does acyclic means in context of visualization?

What is difference between rollover & brushing?
What is sunburst model? How information can be represented in it?
What are the major problems in 3D visualizations? How can they be solved?
Describe several information visualizations that you believe will be possible and useful with the widespread adoption of virtual reality systems.
Name & describe few techniques that are suitable for representing huge amount of data. What are their relative merits?
Explain what Tufte meant by ‘Data-Ink Maximization’.

Visualization is one of the most powerful ways available to improve your brainstorming, ideation, organizaing, planning, communication, and measurement. But don't take our word for it! There has been a lot of scientific research on the topics.

Questions to ask when considering visualization tools:

How do you define and measure the quality of a chart?
Which tools allow you to produce interactive graphs or maps?
Which tools do you recommend for big data visualization?
Which visualization tools can be accessed via an API, in batch mode? (for instance, to update earthquake maps every 5 minutes, or stock prices every second)
What do you think of Excel? And Python or Perl graph libraries? And R?
Are there any tools that allow you to easily produce videos about of your data (e.g. to show how fraud cases or diseases spread over time)?
In Excel you can update your data: then your model and charts get updated right away. Are there any alternatives to Excel, offering the same features, but having much better data modeling capabilities?
How do you produce nice graph structures - e.g. to visually display Facebook connections?
What is an heat map? When does it make sense to use it?
How do you draw "force-directed graphs"?
Good tools for raster images? for vector images? for graphs? for decision trees? for fractals? for time series? for stock prices? for maps? for spatial data?
How can you integrate R with other graphical packages?
How do you represent 5 dimensions (e.g. time, volume, category, price, location) in a simple 2-dimensional graph? Or is better to represent fewer dimensions if your goal is to communicate a message to executives?
Why visualization tools used by mathematicians and operations research practitioners (e.g. Matlab) are not the same as tools used by data scientists? Is it because of the type of data, or just historical reasons?

☛ What do you mean by the term visualization?
☛ How does computer graphics helps in visualization?
☛ Name few of the fields that are heavily dependent on visualization?
☛ Data visualizations have been there for decades, but in near past IT industries have had a great impact on them, how?
☛ What is the significance of IT industries over visualization?
☛ Can you name some of the downsides of Visualization?
☛ Give few examples of Visualization tools that are available in the market?
☛ Give the references of few real life scenarios in which visualization play important role?
☛ How does visualization amplifies cognition?

☛ Differentiate Data Visualization with Statistical Graphics?
☛ What are various types of information visualization techniques?
☛ Draw the flowchart of visualization stages?
☛ Name few of the sub-fields of Visualization?
☛ How would you differentiate visualization with a data-based infographics?
☛ Name few of the primitive form graphical data representation?
☛ What is a tag cloud? How do bloggers use them to present their information?

☛ Is it possible to have Dynamic Visualizations? If yes, then frame a scenario in which dynamic visualization would be a better option than other counterpart?
☛ How visualization can be a boon in education sector?
☛ Give two ways Information visualization improves cognition?
☛ What kind of rich compelling visualizations would be suitable for representing trends of a country's population?
☛ Is it possible that visualization might have user interactions as well in it? In which scenarios we can employ user interactions in addition to visual representation of data?
☛ What is common way of visually representing multivariate data-sets?
☛ Explain briefly basic elements of a graph. How can it be visualized?

☛ List and give examples of the Wehrend & Lewis eleven basic actions in visualization environments?
☛ Can give few examples of applications which allow zooming while maintaining context?
☛ What are the fundamental problems faced by the applications providing zooming capabilities?
☛ Pour some light over pre-attentive processing?
☛ What are the ways for solving problem of occlusion while drawing edges of a map or a graph?
☛ What is the main yet to be solved problem that always haunt people in the field of information visualization?
☛ What are the trends expected in the field of information visualization in near future?

☛ What is data mining? How it is different from information visualization?
☛ What do you understand by mind-maps?
☛ What is scientific visualization? How it is different from other visualization techniques?
☛ What is flow visualization? How it is different from volume visualization?
☛ Semiotics of graphics plays important role in visualization. How?
☛ Can you pour some light over Gibson's Affordance theory?
☛ What is the concept of data suppression?

☛ What are the capabilities of adobe's Flex Framework? How can we use it for creating rich visualizations?
☛ What are hyperbolic tree views? How they are used in visual representation of data?
☛ Mention few advantages & disadvantages of tree-maps method of visualization?
☛ What do you understand by magic lens technique? How it is used for information visualization?
☛ What is document visualization? What are common issues in it?
☛ List few methods to solve problem of data overflow from the screen?
☛ What are chernoff faces & how they are useful in information visualization?

☛ There are three types of variable we use in information visualization. What are they? Explain them.
☛ Scatter-plot matrices are widely used in field of information visualization. What kind of data do it represent?
☛ What does a cyclic means in context of visualization?
☛ What is difference between rollover & brushing?
☛ What is sunburst model? How information can be represented in it?
☛ What are the major problems in 3D visualizations? How can they be solved?
☛ Describe several information visualizations that you believe will be possible and useful with the widespread adoption of virtual reality systems?
☛ Name & describe few techniques that are suitable for representing huge amount of data. What are their relative merits?
☛ Explain what Tufte meant by 'Data-Ink Maximization'?

A portion of a picture that is to be displayed by a window is known as window port. The display area of the part selected or the form in which the selected part is viewed is known as view port.

Several processing units:
☛ Contains a special purpose processor, called video controller or display controller
☛ Video controller: A fixed area of the system memory is reserved for the frame buffer, and the video controller is given access to the framebuffer memory.
Tow registers are used to store the coordinates of the screen pixels.
The value is stored in the frame buffer for this pixel position is then retrieved and used to set the intensity of the CRT beam Initially the x register is set to 0 and the y register is set to ymax.
Then the x register is incremented by 1, and the process repeated for the next pixel on the top scan line.

Resource Manager now handles access to all localized resources in an application. Any components that extend UIComponent, Formatter, or Validator now have a new resourceManager property, which lets you easily access the singleton instance of this manager. If you?re writing some other kind of class that needs to use the Resource Manager, you can call Resource Manager. get Instance() to get a reference to it.

The salient feature of computer graphics is the creation and manipulation of graphics (artificial images) by computer.
Computer graphics provides a tool called as motion dynamics which allows user to move object.

When a key is pressed on the keyboard, the keyboard controller places a code carry to the key pressed into a part of the memory called as the keyboard buffer. This code is called as the scan code.

The emissive display converts electrical energy into light energy. The plasma panels, thin film electro-luminescent displays are the examples.