OSU Cartography 5200 Final || Questions and 100% Accurate Answers.
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Course
OSU Cartography 5200
Institution
OSU Cartography 5200
What is the basic idea of dot density mapping? correct answers Visually display density of a variable over an area through the use of representative dots.
Do dot maps use derived data or totals? correct answers TOTALS
Map readers tend to underestimate the number/density of dots. Is it possibl...
OSU Cartography 5200 Final || Questions and 100%
Accurate Answers.
What is the basic idea of dot density mapping? correct answers Visually display density of a
variable over an area through the use of representative dots.
Do dot maps use derived data or totals? correct answers TOTALS
Map readers tend to underestimate the number/density of dots. Is it possible to correct this?
correct answers It is possible, but because the impact on the overall pattern is small, correction
may not be necessary.
What happens visually to a dot map if the data range is too small/dot value too large? correct
answers Gives the appearance of uniformity
What happens visually to a dot map if the data range is too large/dot value is too small? correct
answers Creates visual extremes.
What is spatial proxy? correct answers The dot's function of representing geographical space.
Don't place the dot exactly on top of a location, but rather in the approximate center of the
locations it represents.
How are enumeration units symbolized on a dot map? correct answers The enumeration units the
data is based on should not be symbolized on the map. At least one level difference between
enumeration units is suggested. (example: if data is collected from a county level, don't include
the county boundaries)
What is dot value? correct answers The number of items being represented per dot.
What is dot size? correct answers The size of the actual dot being used.
What is a good number of dots to have in a statistical area with the least mapped quantity?
correct answers 2 or 3 dots.
Do the dots on a dot map mark an exact spot where the geographic phenomena exists? correct
answers NO, dots are distributed randomly.
What are the requirements for a legend of a dot density map? correct answers 1. Have at least
one statement that indicates the dot value (how many of X thing is represented by one dot)
2. Ideally have three boxes illustrating low, medium, high densities
3. Statements identifying enumeration units
4. Disclaimer regarding random distribution
What is an example of a bivariate/multivariate dot density map? correct answers Each dot has a
different color and shape.
,What is the basic idea of graduated/proportional symbol mapping? correct answers The bigger
the symbol, the more of X thing
Which data is appropriate for proportional/graduated symbol maps: intervals/densities/data with
small ranges OR totals/ratios/proportions? correct answers Totals, ratios or proportions are all
appropriate data to use.
What is a true point? correct answers OCCUR at points
What is a conceptual point? correct answers AGGREGATED at points
What technique do proportional symbols use? correct answers Absolute scaling (AKA
mathematical scaling)--the size of each symbol is directly related to the corresponding data
value.
What technique do graduated symbols use? correct answers Range grading--data values are
divided into groups and a symbol is assigned to each group (similar to classes choropleth maps).
Which map technique has symbols that are proportional to the data values? correct answers
Proportional
What should be considered before using pictorial symbols for a proportional/graduated map?
correct answers Pictorial symbols are "fun" but the more irregular the shape of the symbol, the
harder it becomes for the map reader to estimate magnitude/compare quantities from place to
place.
What should be considered before using 3D geometric symbols for a proportional/graduated
map? correct answers Volume is underestimated to a greater degree than area.
If one were going to use pictorial symbols or 3D geometric symbols, which mapping technique
would be more appropriate: proportional or graduated symbols? correct answers Graduated
(range grading) recommended
What is apparent magnitude scaling? correct answers >AKA perceptual scaling
>Scaling of proportional symbols that incorporates correction factors to compensate for the
normal underestimation of a symbols area or volume
>Can only be used for proportional maps/absolute scaling
>Yields adjustment factor for sizing circles upwards
>Developed by Flannery
What is the Ebbinghaus illusion? correct answers The effect of neighboring symbols effects the
judgement of size. A normal circle will appear smaller than it is when surrounded by large
circles, and it will appear larger than it is when surrounded by smaller circles.
, When there is overlap on a graduated/proportional symbol map, which symbols be in the
background and which symbols should be in the foreground? correct answers Smaller symbols
should be brought to the front and larger symbols should be sent to the back.
What is a nested legend type? correct answers Circles or semicircles "nested" inside of each
other.
What is the difference in legends between proportional and graduated symbol maps? correct
answers Proportional symbol: ~3-4 anchors and single values
Graduated symbol: ~4-5 classes and ranges of values (range grading)
What is redundant coding? correct answers Expressing the same variable by more than one
visual variable
What are the pros to redundant coding? correct answers Can reinforce the information in the
symbol sizing
What are the cons to redundant coding? correct answers Can direct too much attention to the
largest figures. May appear as a bivariate map.
What is the basic idea of a cartogram map? correct answers The areas are "proportional to the
attribute data they represent".
What are the advantages of using cartograms? correct answers >Surprise your map reader
>Show distributions obscured by relationship to area
>Simplify unnecessary detail
What are the disadvantages of using cartograms? correct answers >Repugnance at "inaccurate"
base map
>Interpretation might not be intuitive
>Distortion can make location difficult to identify
What is absolutely required for understanding a cartogram? correct answers It is required for the
reader to be familiar with the geographic relationships within the mapped space.
Which data is appropriate for cartograms, totaled or derived? Negative values? Zero? correct
answers Both totaled and derived data is appropriate for cartograms. Negative values cannot be
mapped. Zeroes are problematic because the area would entirely disappear with them.
How do large data ranges affect cartograms? correct answers Potentially ineffective visual
extremes (huge continents vs tiny stick sized continents)
How do small data ranges affect cartograms? correct answers Little or no visual difference
Which are easier to produce, contiguous or noncontiguous cartograms? correct answers
Contiguous
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