Tuesday, December 16, 2008

What is the RMS Error?

The Root Mean Square (RMS) Error is an important parameter which is frequently used in GIS. The RMSE is used as an indictor of the accuracy of the spatial analysis and/or remote sensing.

The RMSE is a measure of the differences between the predicted or calculated values and the actual, or observed/measured, value. Each individual difference between the calculated and actual value is called a residual. The RMSE aggregates the residuals into a single measure.

The RMSE is derived by squaring the differences between the actual and calculated values, adding these residuals together, dividing that by the total number of values, and taking the square root of the result.

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