distort a certain property Definition The representation of the globe on a two dimensional flat map All maps have four features that can be distorted that include Shape Size area distance and direction The reason for this being that there is no perfect way to represent a 3D object on ID: 627867
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Slide1
Map ProjectionsSlide2
No map projection is perfect and all maps
distort a certain property
.
Definition: The representation of the globe on a two dimensional flat map.
All maps have four features that can be distorted that include: Shape, Size (area), distance, and direction. The reason for this being that there is no perfect way to represent a 3-D object on a 2-D plane. Each different type of map sacrifices one or more of these properties to make a flat map.
Map ProjectionsSlide3
Map Name
Map
Uses
Distortion
Way to identifyRobinson
Just a compromise.
Distorts a little bit of everything.Round sides and flat top and bottom.Slide4
Map Name
Map
Uses
Distortion
Way to identifyMercator
Used by
ships for navigation.Size and shape especially at the poles.Greenland looks about the same size as Africa.Slide5
Map Name
Map
Uses
Distortion
Way to identifyGoode
HomolosineSlide6
Map Name
Map
Uses
Distortion
Way to identifyPolar
Used for airline
companies to discover cheapest route across oceans.Distorts the bottom half of the globe.It’s completely round and the image is from above looking down.Slide7
Map Name
Map
Uses
Distortion
Way to identifyPeter
Preserves area to accurately display the actual land mass especially to “third world” countries, that were mapped biasedly earlier.
Shape of countries especially near the equator.Africa and South America are longer and Europe is more compact.Slide8
Map Name
Map
Uses
Distortion
Way to identifyAzimuthalSlide9
Reference Maps-
show features related to location which can be
natural
or man-made. For example: road maps, political maps,and topographical maps.
Thematic Maps- are based on a particular characteristic or theme. Different types of thematic maps are better suited to
represent
some data than others, depending on the data and the objectiveTypes of MapsSlide10
Types of thematic maps
Choropleth mapping
shows statistical data aggregated over predefined regions, such as counties or states, by coloring or shading these regions.
Choropleth map of water use.Slide11
Thematic map
A
Cartogram
- distorts land area based on some variable .
Population 2050Slide12
Thematic map
Acres of Harvested Wheat in Illinois in 2012
A
dot distribution
map (also known as dot density map) is a map type that uses a dot symbol to show the presence of a feature or phenomenon. Dot maps rely on a visual scatter to show spatial pattern.Slide13
You better know your Map Projections and Types of Maps!