Rubbersheet - Set Control Points Dialog Box

Use this dialog box to set the locations of control points for use in a rubbersheeting operation.

Method

Use this area to select the rubbersheeting method that best suits your image. After setting the control points, you can switch from one method to the other and preview the results before making a final decision.

Triangular

Specifies the use of the triangular method.

Polynomial

Specifies the use of the polynomial method.

Degree

Used only with the polynomial method, to specify the polynomial degree, which affects the accuracy of the rubbersheet operation.

Control Point Table

ID

Specifies the control point number.

Error

Used only with the polynomial method, to specify the distance from the intended to the actual destination point after the rubbersheet operation. This distance is also known as the root-mean-square (RMS) error for the control point.

Source Point

Specifies the coordinates of the source point in the image.

Destination Point

Specifies the coordinates of the intended destination point, after the rubbersheet operation.

Total RMS Error

Displays the total root-mean-square error for the set of control points.

Buttons

Add Points <

Click to add pairs of source and destination points.

Grid Points

Click to open the Grid Parameters Dialog Box and create a grid to use in the rubbersheeting operation.

Delete

When a row is selected in the Control Point Table, click to delete the row.

Repick <

When a row is selected in the Control Point Table, click to repick a pair of points.

Zoom To <

When a row is selected in the Control Point Table, click to zoom in to the vicinity of the pair of control points.

Preview

Click to preview the effects of a rubbersheet operation using the current settings.

Import

Click to import a set of control points, saved in a text (.txt) file.

Export

Click to export the existing points from the Control Point Table to an external text file.

Auto Zoom

Specifies that the drawing window automatically zooms in to the vicinity of a particular pair of control points when they are selected in a repick operation.