Insert Fly Line (InsFly)

Type: Interactive Application

Digitizes a line in fly mode, in which the line is drawn freehand in stream mode. Places the proper number of points on the line as determined by user parameters to make the line smooth. This is useful for digitizing contours, water lines and DTM break lines. A manual mode, which allows points to be digitized manually, may be engaged when in stream digitizing mode.

Both the VrOne key layout and the old style key layout are supported. The key layout may be set in Enter Parameters from the Main Menu.

Local Commands

PARAMETERS

Tube Filter

When filtering lines, two parameters determine which points are kept:

When a data point falls outside the current tube, the last point within the tube is saved and a new tube direction is set based on the new point and the last point. If a line is straight and points do not move out of the tube, the Maximum tube distance is used to save points.

When setting these parameters, the Maximum tube distance should always be larger than the Tube radius.

Example:

Dither Distance

When collecting a line, all the points are first placed in a buffer. When the line is ended the points are then filtered using the current parameters. The Dither distance specifies how far the floating mark or cursor must travel before a point is placed in the buffer.

Example:

Dither distance:       .05 inches or 1.3 mm

Z Rube Radius

Specifies in ground units the elevation filter to apply to points in the input buffer. If set to 0, no elevation filter is applied.

When a line is being collected, points are stored in a temporary buffer using the Dither Distance.  When the line is saved, the points in the buffer are filtered using the Tube Radius, Z Tube Radius and Maximum Distance.  Points that are “Forced” during collection pass through the filter unmodified.

Dither Buffer Size

This parameter defines the maximum number of points that may be stored in the dither buffer.  When this buffer is full, the points are filtered and the resulting line is saved.  If the line is not yet complete input will continue seamlessly.  Setting the dither buffer size to a smaller value will typically produce multiple lines that make up the entire line.  The interactive application Join Lines (JoiLin) or the batch application Batch Join (BatJoi) may be used to join the multiple lines into a single line.  The default value for the dither buffer size is 10,000.

Button Assignments

Ins Fly Line – Main

The contour interval may be set in Z Source (Zsou).

Ins Fly Line – Stream (VrOne layout)

Ins Fly Line – Stream (Old style layout)

Ins Fly Line – Splice (VrOne layout)

When this menu is entered, point collection stops and the operator may look around. This is often used when pulling contours or break-lines through dense vegetation. Splice may be used to remove the end portion of the line and continue from that point.

Ins Fly Line – Splice (Old style layout)

When this menu is entered, point collection stops and the operator may look around. This is often used when pulling contours or break-lines through dense vegetation. Splice may be used to remove the end portion of the line and continue from that point.

Ins Fly Line – Snap

This menu will be used if snap is turned on from the Stream menu. It is a modified version of snap that allows snapping and ending a line. Due to the nature of Fly Line, snapping to end a line requires this menu.

Ins Fly Line – Dig Manual

Points may be digitized manually when button 5 is pressed when in Stream mode.