Tuesday, December 2, 2008

Star Plots


A star plot is a multi-data representation of information. It uses various points to display the information within the plot. It uses spokes (lines) to connect the points within it. The data length of a spoke is proportional to the magnitude of the variable for the data point relative to the maximum magnitude of the variable across all data points. The above map is an example of a star plot, showing the crime rates within certain cities. It does not show the data used to mark each point but it shows how each point is different than other cities and how variables affect the image. The points given in each give the appearance of the star giving the name a star plot.

Correlation Matrix


A correlation matrix uses two or more variables to describe something. One variable is a correlation of the other. The above matrix describes an unknown area. It shows how certain items, such as different types of pollution and temperature affect each other. It is used to describe mathematical information about a place. A correlation matrix can also be used to describe distances. One city location compared to another affects the distance between each other. A lot of atlases have correlation matrices of mileages showing different cities.

Histogram


A Histogram is similar to a bar graph. The difference is the Histogram is calculated by the area of the bar not necessarily the height.

Parallel Coordinate Graph


A Parallel Coordinate Graph is used to show information that has multiple problems. Each set of information is set up in equal spaced axis. A data dimension connects each point along each axis to bring everything together.

Triangular Plot

http://ex-parrot.com/~chris/tmp/talk-2004-06-15/end-of-2003.png

A Triangular Plot is used to chart or document proportions or percentages that are caused by three variables. There are three sides of the triangle, using each side for one of the variables. The points on the chart are then placed accordingly based on each variable.

Windrose


A Windrose is a tool to show meteorologists how wind speeds and directions are generally distributed over a certain area. The length of the spokes show the frequency of the wind speeds. The center of the Windrose is the starting point of the chart. It starts at zero and gets larger towards the outer portion of the circle.

Climograph


A climograph is used to show the monthly precipitation and temperature conditions for a desired place. The climograph uses both a bar graph to show one variable and a line graph shows the other. For example, the above graph has a red bar graph and blue line graph used to show the other variable. Along the bottom shows each month that the data was retrieved.