Tzung-May Fu ([email protected]) Dept. of Atmospheric ... · Key points to consider and revisit 1....
Transcript of Tzung-May Fu ([email protected]) Dept. of Atmospheric ... · Key points to consider and revisit 1....
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Tzung-May Fu ([email protected])Dept. of Atmospheric & Oceanic Sciences, Peking University
Atmospheric Chemistry & Climate @ Peking Universityhttps://www.phy.pku.edu.cn/atmoschem
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Resources
Ø David Schultz’s book Eloquent science and his blog
eloquentscience.com/
Ø Buckingham (2008), Effective scientific illustrations, Lab Times
Ø Rolandi et al. (2011), A Brief Guide to Designing Effective
Figures for the Scientific Paper, Advanced Materials
Ø Rougier et al. (2014), Ten simple rules for better figures, PLOS
Computational Biology
Ø PSU College of Earth & Mineral Sciences, Style for students
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“Data figures” and “concept figures”We will mainly focus on “data figures” prepared for scientific publications and presentations
[Bjerknes, 1919]
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Why do we plot?
Ø To provide more information: to visualize ideas that are hard to show otherwise
Ø To focus attention: to direct focus to ideas that otherwise may be easily buried in texts and tables
Ø To tell a story: to build connections between plot elements or between a series of plots
Ø To broadcast our work: figures travel faster and further than texts
“Scientific visualization is a graphical interface between people and data.”
Rougier et al. (2014)
“You should always have one memorable figure in your paper.”
~ Daniel Jacob
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Key points to consider and revisit
1. Know your audience.
2. Know your key message. Readers should
be able to get the main message without
reading the text.
3. Be honest. Use real data and show
uncertainty. Do not mislead readers.
4. Show the data, not the design.
5. Assess necessity.
6. Throw away plots that don’t work.
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Why not Excel?
l Excel is ok for cursory data exploration to produce “working
figures”, but it does not produce publication-quality figures
l Matlab, IDL, NCL take effort but are worthwhile in the long run
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10 basics for making effective plots
1. Choose the right type of plot. No pies!
2. Consider size, ratios, axes, directions
3. Optimize lines & symbols.
4. Optimize colors & color scales.
5. Optimize labels & legends.
6. Use consistent fonts and font sizes.
7. Use 3-D effects and animations with caution.
8. Focus on key message and simplify. Maximize data-to-ink
ratio. Adapt to the media.
9. Write full captions from the very beginning.
10. Choose the right format and resolution.
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1. Choose the right type of plot (No pies!)
Choose the simplest type of plot that does the job!
Ø Scatter plot: show correlation between 2 numerical variables (x: predictor
variable, y: response variable) or (x: observations, y: model)
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1. Choose the right type of plot (No pies!)
Ø Line plot: show continuous changes in a numerical variable (timeseries,
profiles)
Li, Fu et al [2013]
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1. Choose the right type of plot (No pies!)
Ø Bar chart: good for comparing differences between categorical variables
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1. Choose the right type of plot (No pies!)
Line charts and bar charts can sometimes better alternatives for each other
Schultz (2009), Eloquent Science
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1. Choose the right type of plot (No pies!)
Ø Pie chart: can usually be replaced by bar charts
EC OC
1.92 3.95 4.14
6.67±1.30
Chi
nese
em
issi
on [
Tg C
y-1
] Biomass burning
Residential
Power + industry + transportation
3.05±0.78
Fu et al. [2012]
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1. Choose the right type of plot (No pies!)
Ø Pie chart: can usually be replaced by bar charts
If you absolutely must use pies …
Which one is better? Why?
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1. Choose the right type of plot (No pies!)
Ø Maps: geographical locations
Ø Vector maps
Ø Streamline maps
Ø Weather maps
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1. Choose the right type of plot (No pies!)
Ø Contour plots: show continuous changes in 2-D spaceHovmöller plot
5-day running mean OLR anomalySurface O3 concentration
NOx-sensitive
NOx-saturated
Sillman et al. [1990]
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1. Choose the right type of plot (No pies!)
Ø Contour maps: show continuous change on a map
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1. Choose the right type of plot (No pies!)
Ø Pixelated maps: show discrete changes over a map and emphasize hotspots
Asian NMVOC emissions for 2001[Mg y-1 box-1]
Streets et al. [2003] Fu et al. [2007]
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1. Choose the right type of plot (No pies!)
Simulated DO3 using two different emission inventories
Pixelated map Filled contour map
Which one is more appropriate? Fu et al. [2007]
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1. Choose the right type of plot (No pies!)
Ø Photos: visual results from experiments and observations
Jiang et al. [2004]
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1. Choose the right type of plot (No pies!)
Other types of plots:ØFlow charts: protocols, algorithms ØConceptual plots: processes
[Meng et al., 2013]
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1. Choose the right type of plot (No pies!)
Other types of plots:ØApparatus / methodology
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Not everything needs to be a plot!
Fu et al. [2008]
Ann
ual S
OA
sour
ce [T
g C
y-1
]
6.79.0
11
1.8
Reversible partitioning Irreversible uptake by aerosol (10%) and clouds (90%)
Glyoxal 2.6
Methyl-gyloxal 8.0
AnthropogenicBiofuel useBiomass burningBiogenic
20%
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2. Consider size, ratios, & axes
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2. Consider size, ratios, & axes
Schultz (2009), Eloquent Science
During which period did the sea ice area experience the sharpest decline?
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2. Consider size, ratios, & axes
Jian and Fu [2014] Fu et al. [2008]
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2. Consider size, ratios, & axesChoose appropriate axis style and range
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3. Optimize lines and symbols
Rolandi et al. (2011), A brief guide to designing effective figures for the scientific paper, Advanced Materials
There are many types of contrast, but one (at most two) is usually enough
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3. Optimize lines and symbols
People are best at detecting differences in length (in one direction)
Rougier et al (2014), Ten simple rules for better figures, PLOS Computational Biology
30 20 15 10
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3. Optimize lines and symbolsChoose lines & symbols (thickness & sizes) that show data clearly and contrast easily
Ø Closed symbols show up better
Ø Open and closed symbols show
maximum contrast
Ø Squares and circles look similar
Ø Size: depends on amount of data and
precision
Fu et al. [2009]
Bad example: symbols obscured
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3. Optimize lines and symbolsChoose lines that show data clearly and contrast easily
Ø Keep line styles simple (< 3 styles)
Ø Make thickness and style differences obvious
Ø Use thick, solid line to show observations
Ø Use thinner, dashed lines to show less important results
Ø Lines should be thick. Do not use hairpin lines anywhere
soliddasheddotted
Control exp C2
+ no IAV in natural emis
+ no IAV in anthropogenic emis+ no IAV in relative humidity+ no IAV in cloud and radiation+ no IAV in horizontal wind
+ no IAV in temperature[Fu et al., 2015]
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3. Optimize lines and symbols
Ø Use <3, simple texture patterns
O OX X X X XHatched bar
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3. Optimize lines and symbols
Presenting uncertainties:
1. Box plot: mean, median, 25th & 75th percentiles, outliers
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3. Optimize lines and symbols
Presenting uncertainties:
2. Error bars: standard deviation, 95% confidence interval, range
3. Ensemble results: permutation uncertainty
Fu et al. [2015]
Whiskers/shading: standard errors of the slopes
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4. Optimize colors and color scalesØ Do not use more than 5 shades for
quantification
Schultz (2009), Eloquent Science
Ø Use colors only if necessaryØ Instead use B/W or monotone shades
to reduce cost and to maintain figure quality for B/W printing
Fu et al. [2007]
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4. Optimize colors and color scales
Best practice: use color and patterns that reproduce well in B/W, although this is not always possible with > 3 colors
Bad example: here, red and black can be distinguished, but blue and grey get mixed-up
Fu et al. [2012]
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4. Optimize colors and color scalesUse unambiguous, saturated colors for lines and symbols
black
red
green
orange
blue
purple
grey
good bad
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4. Optimize colors and color scales
Rolandi et al. (2011), A brief guide to designing effective figures for the scientific paper, Advanced Materials
Use sufficient contrast, use color if necessary
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4. Optimize colors and color scales
Abrupt color jumps qualitatively emphasize thresholds and hotspots
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4. Optimize colors and color scales
Bad color scale: abrupt color jumps make it hard to detect differences quantitatively
I made this plot and published it
Fu et al. [2007]
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4. Optimize colors and color scalesTry to use colors that make physical sense
Precipitation anomaly over Canada
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4. Optimize colors and color scales
numerical variables
CO emission scale factor
categorical variables
Kopacz et al. [2007]
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4. Optimize colors and color scales
Light and Bartlein (2004), The End of the Rainbow? Color Schemes for Improved Data Graphics, EOS
Red-green colorblind
Green colorblind
Red-green colorblind
Green colorblind
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4. Optimize colors and color scales
colorbrewer2.orgvischeck.com
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5. Optimize labels and legendsTry to label the figure, not the legend, unless doing so clutters the figure too much
Buckingham (2008), Effective scientific illustrations, Lab Times
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5. Optimize labels and legends
Ø All elements and axes should be clearly labeled
Ø Avoid changing orientation of labels
Ø Avoid acronyms and abbreviations in labels and legends, unless
necessary and defined in text
Ø Numeric labels should show appropriate significant figures
Ø Units should be in MKS and written as [103 mg cm-2 s-1]:
NOT [1000 mug/grid/s]
NOT [1000 mg/cm2 • s]
NOT [thousand ug/s cm2]
Ø 36.7 oC, 80 oF, BUT 273.15 K
Ø Do not draw box around the legend
Ø Scales should be hard-wired inside photo,
next to features
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6. Use consistent fonts and font sizes
Serif font (Times, 12 pt) 宋体Sans serif font (Arial, 12 pt) 黑体
Serif font (Times, 24 pt) 宋体Sans serif font (Arial, 24 pt) 黑体
Original resolution
Reduced resolution
Reduced font size
Use Arial (Helvetica) for English, 黑体 for Chinese, symbol for Greek letters
Special fonts may not show up the way you intended!
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6. Use consistent fonts and font sizes
Number labels often tend to be too small
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7. Use 3-D effects and animations with caution
3-D effects usually only useful for presenting qualitative information
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7. Use 3-D effects and animations with caution
I published this one, too
More often than not, 3-D effects are useless or even confusing
Zhang et al. [2013]
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7. Use 3-D effects and animations with caution
Ø Several journals now allow multimedia in online supplementary materials.
Ø Animations and movies can be welcome breaks in presentations, if and only if they play correctly.
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8. Focus on key message and simplify
Rolandi et al. (2011), A brief guide to designing effective figures for the scientific paper, Advanced Materials
Maximize data-to-ink ratio!
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8. Focus on key message and simplify
Maximize data-to-ink ratio!
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8. Focus on key message and simplify
Buckingham (2008), Effective scientific illustrations, Lab Times
Maximize data-to-ink ratio!
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8. Focus on key message and simplify
Rougier et al (2014), Ten simple rules for better figures, PLOS Computational Biology
Adapt to the support medium
Journal Oral presentation
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Adapt to the support medium
Fu et al. [2008]
Ann
ual S
OA
sour
ce [T
g C
y-1
]
6.79.0
11
1.8
Reversible partitioning Irreversible uptake by aerosol (10%) and clouds (90%)
Glyoxal 2.6
Methyl-gyloxal 8.0
AnthropogenicBiofuel useBiomass burningBiogenic
20%
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9. Write full captions from early on
Figure 1. Ship arriving too late to save a drowning witch (Zappa, 1982).
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9. Write full captions from early on
Paulot et al. (2009), Science
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10. Choose the right format and resolution
Ø Good formats: ps, eps, tiff (for photos)
Ø Bad formats: gif, jpg
Ø Plot to the correct published size. Do not enlarge with software.
Ø Submit high resolution figures for review
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11 …
Revise and edit!
没有最好,只有更好
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Develop a consistent style
1. Easier to apply your code to new datasets to make similar plots
2. Reduce mistakes and bad plots
3. Easier to put together a consistent presentation in the future
4. Consistently show a good, clear style can be your trademark
and your advertisement
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Creative composition (but only if it works!)
Wakimoto and Martner (1992)
Schultz (2009), Eloquent Science
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Creative composition (but only if it works!)
Schultz et al. (2003), MWR
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Creative composition (but only if it works!)
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Creative composition (but only if it works!)
Taylor diagramhttp://www.ncl.ucar.edu/Applications/taylor.shtml
[Taylor, 2001]
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No pies!
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Creative composition (but only if it works!)
Zhang et al. (2007), GRL
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Make the key message “scream”!
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Creative color use (but only if it works!)
Ellis et al. (2013), ACP
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Poor examples
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Avoid chartjunk
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Resources
Ø David Schultz’s book Eloquent science and his blog
eloquentscience.com/
Ø Buckingham (2008), Effective scientific illustrations, Lab Times
Ø Rolandi et al. (2011), A Brief Guide to Designing Effective
Figures for the Scientific Paper, Advanced Materials
Ø Rougier et al. (2014), Ten simple rules for better figures, PLOS
Computational Biology
Ø PSU College of Earth & Mineral Sciences, Style for students
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Work in progress
Thank you!