Temporal Raster Plot

A grid diagram (English Carpet plot ) is a graphical representation of occurrences in their temporal context (eg hourly outcry Bung the outside temperature). Each measurement point is added as in a scatter plot in a Cartesian coordinate system, the axes (for example day on the x-axis and the hours on the y- axis ) have different temporal resolutions. This will observations each day at the same time arise, for example, appears in a row. All observations one day be displayed in one column. The observations are color-coded, such as blue for low values ​​, red for high values.

By plotting the data in temporal structures large amounts of data such as measured values ​​shown, for example, with quarter hourly intervals of a year and recorded by the observer quickly. The occurrence of minima, maxima or regular events can be detected optically.

Example

In the example of the electrical power measurement, the measurement values ​​that have been collected during a year quarter hours represented as a grid map. One column contains the respective values ​​of the day from 0:00 bis 23:45 clock clock. Days are juxtaposed. Despite the high number of measurements (about 35,000 ) can regularly occurring patterns or deviations at individual dates are recognized quickly.

In the second example the outside temperature from the test reference year of Augsburg is applied.

Raster charts are often used for quick data analysis and visualization of temporal events. Thus it can be checked, for example, without great effort, whether a scheme (eg flow temperature of a heating system) or a sensor is working correctly.

• Diagram (Statistics )
• Time series analysis