Issues of Scale Using C o l o r

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# Issues of Scale Using C o l o r - PowerPoint PPT Presentation

Issues of Scale Using C o l o r. Scale Issues. What is map scale?. The scale of a map is the relationship between a unit of length on the map and a unit of length on the ground. Map Scales. Verbal scale “One cm represents 100 km” Bar scales (graphical)

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What is map scale?

The scale of a map is the relationship between a unit of length on the map and a unit of length on the ground.

Map Scales

Verbal scale

“One cm represents 100 km”

Bar scales (graphical)

Representative fraction (RF) 1:24,000

Representative Fraction

A 0.025 inch line on a1:24,000scale map represents50ft (600 in) on the ground

A 0.025 inch line on a1:200,000scale map represents almost417ft on the ground

Scale Issues

Beware of scale statements

1:200 (“one to two hundred”) does this mean

unit-to-unit

(one inch on the map equals 200 inches on the ground)

or

not unit-to-unit

(one inch on the map equals 200 feet on the ground)

For this course,

all scale statements will be assumed unit-to-unit

Scale Issues

large scale vs. small scaleTo a geographer:1:2,000,000 is small scale1:200 is large scale

Importance of Scale

Scale of data plays an important role, and frequently causes problems

All spatial phenomena have scale dependent behavior/properties

Be aware of:

Data source scale

Mixing data from different source scales

Appropriateness of output scale

Scale Issues

Data from different sources and scales can vary widely

1:100,000 scale data from USGS DLG

Scale Issues

1:1,000,000 scale data from DCW (DMA)

Scale Issues

1:2,000,000 scale data from USGS DLG

Displaying data: colors

What can color do?

Label

Measure

Represent or imitate reality

Beautify

From Tufte 1990

Wabern, 1983

Displaying data: colors

Primary home heating fuel. U.S. Department of Commerce

From Tufte 1990

Displaying data: colors

Primary home heating fuel. U.S. Department of Commerce

From Tufte 1990

Color Blindness

http://jfly.iam.u-tokyo.ac.jp/color/

Color Blindness

http://jfly.iam.u-tokyo.ac.jp/color/

Color Blindness

http://jfly.iam.u-tokyo.ac.jp/color/

Color Blindness

http://jfly.iam.u-tokyo.ac.jp/color/

Color Blindness

http://jfly.iam.u-tokyo.ac.jp/color/

Redundant Coding

http://jfly.iam.u-tokyo.ac.jp/color/

Redundant Coding

http://jfly.iam.u-tokyo.ac.jp/color/

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Color Schemes

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/faculty/c/a/cab38/ColorSch/Schemes.html

Dr. Cynthia Brewer / Department of Geography / The Pennsylvania State University

http://www.personal.psu.edu/cab38/ColorBrewer/ColorBrewer.html

Homework

Read: “Creating Feature Datasets & Vector Editing” & “Creating and Modifying Tables”

Start working on assignment #4 -- Due April 26.