pattern perception and map design
TRANSCRIPT
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digital-media@rguPattern perception and map design
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what are we looking at?
Gestalts Laws
Representing vector fields
perceptual syntax of diagrams
visual grammar of maps
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Introduction
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Three stage model of
perception
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Three stage model of
perception
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Gestalts Laws
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Proximity Similarity connectedness continuity symmetry closure relative size common fate8simple
Rules
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Proximity
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Proximity
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Place symbols and glyphs representing related information close together
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Similarity
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Similarity
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When designing a grid layout of a data set, consider coding rows and/or columns using low-level visual channel properties, such as
colour and texture.
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Connectedness
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To show relationships between entities, consider linking graphical representations of data objects using lines or ribbons of color.
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continuity
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Symmetry
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Symmetry
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Symmetry
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Consider using symmetry to make pattern comparisons easier
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closure and common region
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closure and common region
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closure and common region
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Consider putting related information inside a closed contour.
A line is adequate for regions having a simple shape.
Colour or texture can be used to define regions that have more complex shapes.
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closure and common region
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To define multiple overlapping regions, consider using a combination of line
contour, colour, texture, and Cornsweet contours.
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figure and ground
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Use a combination of closure, common region, and layout to ensure that data entities are represented by graphical
patterns that will be perceived as figures, not ground.
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Representing Vector Fields:Perceiving Orientation and Direction
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magnitude orientation direction
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Showing direction with brush strokes
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To represent flow direction in a vector field visualization, use streamlets with heads that are more distinct than tails, based on
luminance contrast.
A streamlet is a glyph that is elongated along a streamline and which induces a strong response in neurons sensitive to orientations
tangential to the flow.
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For vector field visualizations, use more distinct graphical elements to show greater field strength or speed. They can be wider, longer, more contrasting, or faster moving.
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Perceptual syntax of diagrams
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creating nodes
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When developing glyphs, use small, closed shapes to represent data entities, and use the color, shape, and size of those shapes to
represent attributes of those entities.
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creating relationships
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creating relationships
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creating relationships
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Use connecting lines, enclosure, grouping, and attachment to represent relationships between entities. The shape, color, and
thickness of lines and enclosures can represent the types of relationships.
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As an alternative to arrows to represent directed relationships in diagrams, consider using tapered lines with the broadest end at the
source node.
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the visual grammar of maps
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1694
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1815
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1918
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Use closed contours, areas of texture, or areas of color to denote geographic regions. Use color, texture, or boundary style to denote the
type of region.
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1922
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Use lines to represent paths and linear geographic features. Use line color and style to represent the type of linear feature.
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Use small, closed shapes to represent point entities, such as cities, that appear small on a map. Use color, shape, and size to represent
attributes of these entities.
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what did we look at?
Gestalts Laws
Representing vector fields
perceptual syntax of diagrams
visual grammar of maps