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Information life-cycle and visualization and check-in for project definitions. Peter Fox Xinformatics – ITEC 6961/CSCI 6960/ERTH-6963-01 Week 9/10, April 13, 2010. Contents. Review of last class, reading Information life-cycle Information visualization Checking in for project definitions

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Information life cycle and visualization and check in for project definitions

Information life-cycle and visualization and check-in for project definitions

Peter Fox

Xinformatics – ITEC 6961/CSCI 6960/ERTH-6963-01

Week 9/10, April 13, 2010


Contents
Contents project definitions

  • Review of last class, reading

  • Information life-cycle

  • Information visualization

  • Checking in for project definitions

  • Discussion of reading

  • Next class



Definitions
Definitions project definitions

  • Life-cycle elements

    • Acquisition: Process of recording or generating a concrete artefact from the concept (see transduction)

    • Curation: The activity of managing the use of data from its point of creation to ensure it is available for discovery and re-use in the future (http://www.dcc.ac.uk/FAQs/data-curator)

    • Preservation: Process of retaining usability of data in some source form for intended and unintended use

    • Stewardship: Process of maintaining integrity across acquisition, curation and preservation


Definitions ctd
Definitions ctd. project definitions

  • Management: Process of arranging for discovery, access and use of data, information and all related elements. Also oversees or effects control of processes for acquisition, curation, preservation and stewardship. Involves fiscal and intellectual responsibility.


The nature of the challenge
The nature of the challenge project definitions

  • To architect information systems today

    • You may play many roles

    • You may not get all the metadata or information you need even if you get the data

    • You will need skills that you were not taught

  • To work with end-users today

    • You may have lots of technical experience

    • You will need new skills in addressing the changing use of data and information

    • One ‘size’ does not fit all



Acquisition
Acquisition project definitions

  • Learn / read what you can about the developer of the means of acquisition

    • Documents may not be easy to find

    • Remember bias!!!

  • Document things as you go

  • Have a checklist (the Management list) and review it often


Curation partial
Curation (partial) project definitions

  • Consider the organization and presentation of the data

  • Document what has been (and has not been) done

  • Consider and address the provenance to date, you are now THE next person

  • Be as technology-neutral as possible

  • Look to add metainformation


Preservation
Preservation project definitions

  • Usually refers to the full life cycle

  • Archiving is a component

  • Stewardship is the act of preservation

  • Intent is that ‘you can open it any time in the future’ and that ‘it will be there’

  • This involves steps that may not be conventionally thought of

  • Think 10, 20, 50, 200 years…. looking historically gives some guide to future considerations


Remember
Remember project definitions

  • The life cycle applies within and before and after your use case…

  • So, let’s look in a little more detail


How the information is created
How the information is created project definitions

  • Systemic

  • Environmental

  • Trial-and-error (or ad-hoc)


How the information is delivered
How the information is delivered? project definitions

  • One-to-many presentation

  • White paper

  • Web site FAQ

  • Web site informational

  • Web site directed (link sent with e-mail, and so on) to a specific Web site

  • Application-based delivery via managed expert system

  • One-to-one presentation:

    • Word of mouth

    • Ad-hoc communication


How the information is managed
How the information is managed project definitions

  • Complexity of the information

  • Complexity of the creation process

  • Complexity of the management system

  • Financial impact of IP/IC creation


Type of information created
Type of information created project definitions

  • Tacit (created and stored informally):

    • Human memory

    • Local hard drive of the computer

    • Expert system (moving tacit information into a formalized structure)

  • Explicit (created and sorted formally):

    • Network share

    • Network Web site/intranet

    • Informal knowledge-management system

    • Document-management system

    • Formal KM system

  • Value of the source

  • Age of the information

  • Proximity of the information to the consumer

  • Source of the information, and previous interactions with that specific source


Value of the source
Value of the source project definitions

  • Age of the information

  • Proximity of the information to the consumer

  • Source of the information, and previous interactions with that specific source


Mostly technical issues
Mostly Technical Issues project definitions

  • Data Preservation

    • Bit-level integrity

    • Data readability

  • Documentation

  • Metadata

  • Semantics

  • Persistent Identifiers

  • Virtual Data Products

  • Lineage Persistence

  • Required ancillary data

  • Applicable standards


Mostly non technical issues
Mostly Non-Technical Issues project definitions

  • Policy (constrained by money…)

    • Front end of the lifecycle

      • Long-term planning, data formats, documentation...

    • Governance and policy

    • Legal requirements

    • Archive to archive transitions

  • Money (intertwined with policy)

    • Cost-benefit trades

    • Long-term needs of programs

    • User input

      • Identifying likely users

    • Levels of service

    • Funding source and mechanism


Life cycle is a complex issue
Life cycle is a complex issue project definitions

  • Must be managed

  • Documented

  • As part of the use case, but also outside it


Information visualization
Information Visualization project definitions

  • Questions to keep in mind

    • What is the improvement in the understanding as compared to the situation without visualization?

    • Which visualization techniques are suitable for one's data/ information?


Why visualization
Why visualization? project definitions

  • Reducing amount of data, quantization

  • Patterns

  • Features

  • Events

  • Trends

  • Irregularities

  • Exit points for analysis

  • Leading to presentation of data

  • Recall – cognitive science and the mental representation??!!??


Types of visualization
Types of visualization project definitions

  • Color coding (including false color)

  • Classification of techniques is based on

    • Dimensionality

    • Information being sought, i.e. purpose

  • Line plots

  • Contours

  • Surface rendering techniques

  • Volume rendering techniques

  • Animation techniques

  • Non-realistic, including ‘cartoon/ artist’ style


Image aka raster file formats
Image (aka Raster) file formats project definitions

  • CGM, the Computer Graphics Metafile, has been an ISO standard since 1987. It has the capability to encompass both graphical and image data.

  • PostScript or more specifically Encapsulated PostScript Format (EPSF), is a page description language with sophisticated text facilities . For graphics, as compared to CGM, it tends to be expensive in terms of storage.


Image file formats
Image file formats project definitions

  • TIFF, the Tagged Image File Format, encompasses a range of different formats, originally designed for interchange between electronic publishing packages.

  • GIF, the Graphical Interchange Format , is quite widespread and can encode a number of separate images of different sizes and colors.

  • PNG, the Portable Network Graphic format


Image file formats1
Image file formats project definitions

  • RGB, the Red Green Blue format of Silicon Graphics, is used by most visualization software packages as the internal image format. The format consist of a header containing the dimensions of the image, followed by the actual image data.

  • The image data is stored as a 2D array of tuples. Each tuple is a vector with 3 components: R, G, and B. The RGB components determine the color of every pixel (picture element) in the image.


Image file formats2
Image file formats project definitions

  • PPM, the Portable Pixmap Format (24 bits per pixel), PGM, the Portable Greyscale Format (8 bits per pixel), and PBM, the Portable Bitmap Format (1 bit per pixel) formats are pixel based and are distributed with the the X-Window system (version 11.4).


Image file formats3
Image file formats project definitions

  • XBM is the X-Window one Bit image file format, which has been standardized by the MIT X-consortium.

  • A major constraint on the use of images is the large data volume which has to be dealt with.

  • Large sets of image data can have severe implications for storage, memory, and transmission costs.

  • Therefore, compression techniques are very important.

  • There are two categories based on whether or not it is possible to reconstruct the initial picture after compression.


Compression any format
Compression (any format) project definitions

  • Lossless compression methods are methods for which the original, uncompressed data can be recovered exactly. Examples of this category are the Run Length Encoding, and the Lempel-Ziv Welch algorithm.

  • Lossy methods - in contrast to lossless compression, the original data cannot be recovered exactly after a lossy compression of the data. An example of this category is the Color Cell Compression method.

  • Lossy compression techniques can reach reduction rates of 0.9, whereas lossless compression techniques normally have a maximum reduction rate of 0.5.


Vector formats
Vector formats project definitions

  • Postscript

  • PDF

  • SVG

  • ‘Shape files’

  • CGM (also)


Animation formats
Animation formats project definitions

  • Mpeg

  • Avi

  • Qt

  • Wmv

  • Animated GIF


Remember metadata
Remember - metadata project definitions

  • Many of these formats already contain metadata or fields for metadata, use them!


Tools
Tools project definitions

  • Conversion

    • Imtools

    • GraphicConverter

    • Gnu convert

    • Many more

  • Combination/Visualization

    • IDV

    • Gnuplot

    • http://disc.sci.gsfc.nasa.gov/giovanni


New modes
New modes project definitions

  • http://www.actoncopenhagen.decc.gov.uk/content/en/embeds/flash/4-degrees-large-map-final

  • http://www.smashingmagazine.com/2007/08/02/data-visualization-modern-approaches/

  • Many modes:

    • http://www.siggraph.org/education/materials/HyperVis/domik/folien.html


Visualization
Visualization project definitions


Managing visualization products
Managing visualization products project definitions

  • The importance of a ‘self-describing’ product

  • Visualization products are not just consumed by people

  • How many images, graphics files do you have on your computer for which the origin, purpose, use is still known?

  • How are these logically organized?


Discovery of visualizations
Discovery of visualizations project definitions

  • When represented as images:

    • Image-based type free text search?

    • Referred to in publications (articles, books, web pages)

  • Vector graphics:

    • Postscript or PDF

    • SVG

    • Others?

  • What makes this easy or hard or impossible?


Discussion
Discussion project definitions

  • About life-cycle in general?

  • Visualization?


Reading for this week
Reading for this week project definitions

  • Is retrospective


Check in for project assignment
Check in for Project Assignment project definitions

  • Analysis of existing information system content and architecture, critique, redesign and prototype redeployment


What is next
What is next project definitions

  • Week 11 – Information and Workflow Management

  • Week 12 – Information Discovery, Information Integration


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