Raster diagram

from Wikipedia, the free encyclopedia

A grid diagram (carpet plot) is the graphic representation of characteristics in their temporal context (e.g. hourly recording of the outside temperature). Each measuring point is entered in a Cartesian coordinate system like a scatter diagram , with the axes having different temporal resolutions (e.g. day on the x-axis and hour on the y-axis). This will make observations such. B. occur at the same time every day, displayed in one line. All observations of a day are shown in one column. The observations are color-coded, e.g. B. blue for low values, red for high values.

By plotting the data in time structures, large amounts of data such as B. Measured values ​​are displayed with quarter-hourly resolution for a year and are quickly recorded by the viewer. The occurrence of minima, maxima or regular events can be recorded optically.


Data: quarter hour values ​​of an electrical power measurement in kW

In the example of electrical power measurement, measured values ​​that were recorded every quarter of an hour during a year were shown as a grid diagram. Each column contains the values ​​for a day from midnight to 11:45 p.m. The days are arranged side by side. Despite the high number of measured values ​​(approx. 35,000), regular patterns or deviations can be recorded quickly on individual days.

The second example shows the outside temperature from the test reference year in Augsburg.

Raster diagrams are often used for quick data analysis and for visualizing events over time. So z. For example, it is easy to check whether a control system (e.g. flow temperature of a heating system) or a sensor is working correctly.

Outside temperature of Augsburg