TM 09 DynamicDataPresentation

Presentation of Dynamic Data

GD3204 Thematic MappingVERSION 01 | DATE 17 MARCH 2014VERSION 01 | DATE 17 MARCH 2014

Undergraduate Program inGeodesy and Geomatics Engineering

Dynamic data

GD3204 Thematic Mapping


D i d tDynamic data

Data that change... With time, space, access, generation, distribution, or

utilization etcutilization, etc. The above mentioned changing parameters may occur

simultaneously, as a pair or combination of three or more.y p


E l R t l iExample: Route planning

Which parameters are changing?


Which parameters are changing?

Presentation options



i i lTime series plot

Typical example of data that change with time3.50

Typical example of data that change with time

2.50

3.00

(m)

1.50

2.00

ater

Lev

el (

0.50

1.00

Wa

0.00

0.50

01/01/2014 01/01/2014 02/01/2014 02/01/2014 03/01/2014


00:00 12:00 00:00 12:00 00:00Date

i i l lTime series plot: Elements X-axisX axis Y-axis

Range of X3.50

Range of Y Intervals Axes titles

2.50

3.00

(m)

Axes titles Grids

1.50

2.00

ater

Lev

el (

0.50

1.00

Wa

0.00

0.50

01/01/2014 01/01/2014 02/01/2014 02/01/2014 03/01/2014


00:00 12:00 00:00 12:00 00:00Date

f iInformation? High WaterHigh Water Low Water Highest

3.50

Lowest Tidal range2.50

3.00

(m)

1.50

2.00

ater

Lev

el (

0.50

1.00

Wa

Meta data?0.00

0.50

01/01/2014 01/01/2014 02/01/2014 02/01/2014 03/01/2014


00:00 12:00 00:00 12:00 00:00Date

Available options for data Available options for data presentationProse Tabulation

The predicted level of Highest Astronomical The predicted level of Highest Astronomical Tide (HAT) is 2.26 m above Lowest Astronomical Tide (LAT). The LAT is used here as Chart Datum (CD) Mean Sea Level here as Chart Datum (CD). Mean Sea Level (MSL) is hence 1.14 m above CD.


B t tiBest options?

Selection of the most appropriate type of data presentation requires understanding of:

The processes involved in generation of phenomena,

Knowledge of the best or common practice, and

h h h d ll b d Insight on how the data will be used.


Comparison between presentationComparison between presentationCredit: Jane E. Miller, Ph.D. - Rutgers University

( ) ( )Prose (texts) Easy way to explain patterns

Prose (texts) Hard to organize lot of numbers

Tabulation Holds lots of numbers

Tabulation Hard to see patternsHolds lots of numbers

Shows detailsHard to see patterns ...

Plot (chart) Holds lots of numbers Easy to see general patterns

Plot (chart) Difficult to see specific value

Easy to see general patterns


P f d t t tiPurpose of data presentation

Understanding data

F h l iFurther analysis

U d t di hUnderstanding phenomena

Generating informationGenerating information

Making decisionMaking decision


C f d t t tiConcerns for data presentation

The target group: different forms of presentation may be needed forThe target group: different forms of presentation may be needed fordifferent audiences (e.g. business or academia, specialists or the general population).

The role of the graphic in the overall presentation: analysing the bigpicture or focusing attention on key points may require different types of visual presentations.p

How and where the message will be presented: a long, detailedanalysis or a quick slideshow.

Contextual issues that may distort understanding: expert or novicedata user.

Whether textual analysis or a data table would be a better solution.


Accessibility considerations:Accessibility considerations: Provide text alternatives for non-text elements such as charts and images. Don’t rely on colour alone. If you remove the colour, is the presentation still

understandable? Do colour combinations have sufficient contrast? Do the colours work for the colour blind (red/green)?for the colour blind (red/green)?

Ensure that time-sensitive content can be controlled by the user (e.g. pausing of animated graphics).

Consistency across data visualizations: ensure that elements withinConsistency across data visualizations: ensure that elements withinvisualizations are designed consistently and use common conventions wherepossible (e.g. blue to represent water on a map).

Size duration and complexity: Is your presentation easy to understand?Size, duration and complexity: Is your presentation easy to understand?Is it too much for the audience to grasp at a given session?

Possibility of misinterpretation: test your presentation out on colleagues,f d l f f h hfriends or some people from your target group to see if they get theintended messages.


Selected case



Case: Oceanographic dataCase: Oceanographic data


Oceanographicg pdata plots

( )Tide (upper)Current (middle)W (b )Wave (bottom)


TidTide

Cyclic vertical change of sea surface.

O d il (di l) Occur daily (diurnal) orhalf‐daily (semi‐diurnal).

Tidal parameter: Height f{A } Height = f{A, }


C tCurrent

Movement of mass of water.

P i bj i h Passive objects in the water column will be drifted l ith th talong with the current.

Current parameters:Current parameters: Magnitude DirectionDirection


WWave

Propagation of energy through sea surface.

Obj fObject on sea surfaceis not substatially drifted i l t l di tiin lateral direction.

Wave parameters:Wave parameters: Height PeriodPeriod Direction Celerity


Types of ‘concluding’ plots



OOccurence

Deviation between predictedand observed tide.

Explain!1.00

0.90

0.80

babi

lity

0.70

0.60

0.50

Prob

0.40

0.30

0 20

D i ti0.140.120.10.080.060.040.020

0.20

0.10

0.00


Deviation

E dExceedance

The inverse of occurence,i.e. (1–P), with P b bili f

0.01

P=probability of occurence.

0.051-PExplain!

0.1

0.25

0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4

0.5

0.750.9

Wave Height (m)


Wave Height (m)

RRose

N

Shows portion of data at given range of magnitudel i

NW NE

60%80%

along a compass section.

W E

20%40%

60%Wave Height (m)

> 1.20

0 90 - 1 20Explain!

0.90 1.20

0.60 - 0.90

0.30 - 0.60

0 00 0 30

SE

S

SW

0.00 - 0.30


S

JPT f l tJPT for rose plot

JPT = Joint Probability Table

R l t i d l d NW

N

NERose plot is developed according to JPT.

NW NE

20%40%

60%80%

Wave Height (m)> 1 20

W E> 1.20

0.90 - 1.20

0.60 - 0.90

0.30 - 0.60

SESW

0.30 0.60

0.00 - 0.30


S

Mapping of oceanographic data



TidTide

Co‐tidal and co‐range chart


Current


WWave

CAUTION: The data shown here is NOT dynamics!


TM 09 DynamicDataPresentation

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