Difference between revisions of "SMS:Error Summary Plot"

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Revision as of 22:10, 16 September 2009

An Error Summary plot is used to display a text listing of the mean error, mean absolute error, and root mean squared error for a data set and the observed values associated with a mesh or grid on observation points in the Observation Coverage. The errors shown are the mean errors for all observation points with computed data.

Mean Error. This is the average error for the points. This value can be misleading since positive and negative errors can cancel.
Mean Absolute Average. This is the mean of the absolute values of the errors. It is a true mean, not allowing positive and negative errors to cancel.
Root Mean Square. This takes the sum of the square of the errors and then takes its square root. This norm tends to give more weight to cases where a few extreme error values exist.

Error Summary plots are created in the Plot Wizard by setting the plot type to Error Summary. A sample plot is shown in the figure.


File:ErrorSummary.gif


Error Summary Plot Options

After the plot type is set in the first step of the Plot Wizard, the Next button is clicked to move to the second step of the Plot Wizard.

Coverage. Displays the name of the coverage where the current data for the plot is coming from.

Measurement. This is the name of the current measurement, created in the Feature Objects | Attributes dialog, being plotted.

Feature Objects. Displays which feature object is utilized in the current plot, points or arcs.



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