RMS Error 1. IDRISI: The rootmeansquare error  a measure of the variability of measurements about their true values. The RMS error is estimated by taking a sample of measurements and comparing them to their true values. These differences are then squared and summed.
RMS errorRoot mean square error. A measure calculated when registering a map to a digitizer, indicating the discrepancy between known point locations and their digitized locations. The lower the RMS error, the more accurate the digitizing or transformation. See also tic.
RMS error Acronym for root mean square error. A measure of the difference between locations that are known and locations that have been interpolated or digitized.
An RMS error of less than or equal to approximately one resolution unit (pixel) for the image being rectified is generally considered acceptable. SEE ALSO i.ortho.photo, photo.camera, photo.2image, photo.init, photo.rectify AUTHOR Mike Baba, DBA Systems, Inc.
The RMS error for the regression is +0.27 m. The other 20% of observations have been used to validate the regression model. The standard deviation of the residuals from these additional points was 0.31 m.
The tic match tolerance is used to ensure a low RMS error during map registration on a digitizer. TIFF Tagged interchange (image) file format. An industrystandard raster data format.
The RMS error is often used as a measure of the accuracy of tic points when registering a map to a digitiser, indicating the discrepancy between known point locations and their digitised locations. The lower the RMS error, the more accurate the digitising or transformation (Walker 1993).
A 1sigma (sigma is denoted bys RMS error equates to the radius of a circle with a 63 percent probability that the position is within the circle. A circle of twice this radius (2 s) represents about a 97 percent probability.
The RMS error is reported in both current map units and digitizer inches. If the RMS error is too high, you can reregister the appropriate control points. To maintain highly accurate data, your RMS error should be less than 0.
14 "Potential Digitization Error" illustrates the inaccuracies of lines representing soil types that result from input control point location errors. By applying an RMS error calculation to the dataset, ...
See also: Location, Map, Coordinate, Geographic, Transform
