The precision of a calculated coordinate is indicated by its error ellipse. Click the Analyze Main Error Ellipse Axis link to display the Calculated Coordinates tab in the Result dialog box. Click the EMA column title to sort the coordinates.
The precision tolerance is specified in the field code list. Click the Manage Field Code List link to open the Manage Field Code List dialog box. Click the Distribution tab. See also Reliability and Precision Tolerance Statement.
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Green light indicates that the precision of all points is within the tolerance. When you distribute the point, EMA will be stored in the attribute TB_ACCURACY_POSITION, and EMH will be stored in TB_ACCURACY_HEIGHT. -
Yellow light alerts you that for some points no precision tolerance is specified, so that the analysis could not be completed. -
Red light indicates that some points are not within the tolerance. The list displays the 5 points that have the largest EMA values.
Error Ellipse
For each point, the error ellipse represents the result of the least squares adjustment, that means it indicates the maximum and minimum values of the standard deviation along with their direction.
For example, if all directions are about the same, this could indicate a general network defect.