Registration Grid

When an image or vector file is registered using the Register command, the control points are shown in the Registration Grid.

Column	Description
ID	The control point number.
Status	On: The control point is active and is used to determine registration Off: The control point is inactive and is not used in registration. The arrow representing it is dimmed during registration and the total number of control points in the Vectors Applied field in the Registration Summary window is changed. If you export the control points, both active and inactive points are exported.
X unregistered	The X location of the control point on the image or vector data.
Y Unregistered	The Y location of the control point on the image or vector data.
Latitude Registered	The X position of the control point on the HPD workspace. If you are using Ground coordinates, this column is called X Registered.
Longitude Registered	The Y position of the control point on the HPD workspace. If you are using Ground coordinates, this column is called Y Registered.
X Residual	Residual values at the X position. Residuals are shown in decimal degrees.
Y Residual	Residual values at the Y position. Residuals are shown in decimal degrees.
XY Residual	Combined or overall residual error. Residuals are shown in decimal degrees.

Residuals display the difference in position between the digitized control point and the computed control point. Residual values reveal discrepancies in the control points and help identify points that are off-position. If the residual values within a column are similar then the target positions are fairly accurate. Wide differences between values suggests that the registration is not accurate.