Exam 2 Flashcards
API
Application Programming Interface.
Allows for different web programming languages to communicate with eachother.
Formula for determining size of a proportional symbol map?
Area1/area2=value1/value2
Bertin’s Visual Variable
Address visual variable use
Shape, hue, value, orientation, texture, and size
Under stand hex colors
rrggbb
Quantile Classification
Different symbols or shades have different values
Quantitative Color Schemes
Colors represent different numerical value
Ordinal Measurements
Quantitative value that can’t be expressed with numbers i.e. Happiness
D3
Data Driven Documents
GeoJSON
Spatial data type used in web mapmaking. Slightly smaller file sizes than KML. More intuitive than XML. Easy to control/manipulate with JavaScript
Tobler
“Everything is related to everything else, but near things are more related to each other” 1970
Tweening
Interpolating movement between key frames
DOM
Document object model. A convention of nested tags. Allows d3 to dynamically access and update the structure, content, and style of a document
Rate of change
Magnitude of an attribute/duration=roc
Apparent magnitude scaling (flannery)
In a Graduated symbol map and flow map, correction factors are applied to compensate for map readers’ underestimation of symbol’s area or volume
Territorial domain
Area that doesn’t appear on the map around the spatial proximity of the dot.
Data needed for a flow map?
Raw or ratio data without negative values
Doing cartogram
Circles
Directional distributive flow map
Quantitative thematic
Difference between topoJSON and GeoJSON?
Topo eliminates redundancy in geo and is lighter by referring to arcs rather than nodes
How to divide into classes with quantile classification?
Equal number of variables in each class
Hue
Range 0-360 like on color wheel
redundant coding
Representing info in more than one way so that map readers have more than one opportunity to understand it. Color and volume to rep flow
Enumeration units
Statistic or administrative areas that are bounded, classified, or aggregated im thematic maps
Gestalt effect
Where brain recognizes whole forms in a graphical image instead of just collections of simpler and unrelated elements (points lines polygons)
CSS comment?
/* fuck my life */
How many standard parallels are in each State Plane Zone?
2
