The Natural Regrade dropdown menu's Edit Longitudinal Profile command gives the user quick access to a powerful longitudinal profile editing tool that can change the entire longitudinal profile of a 3D polyline or just a portion of the profile.
Examples of tasks that this profile editor is well suited for is creating saddles on a long ridge line to further dissect topography and creating a 'hump' on the ridge profile where the user might want to leave excess material.
When the user left-clicks on Edit Longitudinal Profile, the command line directs the user to Select 3D Polyline and the command prompt reads, "Select objects:." The user moves the cursor to the 3D polyline that they wish to edit and left-clicks on the polyline. The "Edit Longitudinal Profile -- Double Click to Adjust Profile" pop-up dialog box appears on the screen. The dialog box has a profile viewer similar to the View Longitudinal Profile command viewer. The user can move the cursor along the profile and the station, elevation, and slope information are displayed along the bottom of the dialog box at the position indicated by the cursor. Simultaneously, an arrow moves along the channel in the drawing locating the point along the longitudinal profile that the cursor is covering.
The dialog box gives the user toggle settings for the following options:
Adjust connecting linework, when toggled on (the default setting) by left-clicking on the box, will cause Natural Regrade to automatically change all connecting linework, e.g., connecting ridges, to smoothly fit the new longitudinal profile. To update contours to reflect the modified surface, the Draw GeoFluv Contours command can be used.
Grid Ticks Only toggle allows the user to see a grid on the profile display or to see only tick marks on the axes.
Radio buttons give the user the following options:
Vertical Exaggeration settings aid the user in evaluating low relief profiles.
Zoom and Pan drag action for the mouse - When set to Zoom, holding the mouse left-click button down while moving it up and down will cause the viewer to zoom in and out on the longitudinal profile. When set to Pan, holding the mouse left-click button down while moving it around the viewer will allow the user to pan around the longitudinal profile. Whether in Zoom mode or Pan mode, the middle mouse button can be held down to pan the profile in the display. Thus, if the user has a middle mouse button, staying in the Zoom mode and using the middle mouse button to pan is most efficient.
A slider button on the Blend 'x'% control allows the user to specify the percentage of the polyline to which they want to apply the profile change. As the user holds down the mouse left-click button on the slider button and moves the slider button left to right, the percentage of the line that will be affected by the edit is displayed above the slider.
When the user has specified the settings that they want to use for the edit, they move the cursor above or below the longitudinal profile in the display to the elevation that they want to raise or lower the profile at that point and double left-click on the mouse. The profile will raise at that point to the specified elevation and the line will blend from that elevation to the remaining profile over the distance specified using the "Blend 'x' %" slider control. The user can make multiple adjustments to the longitudinal profile in this fashion until the desired profile is achieved. The user then left-clicks on the OK button to apply the changes. Left clicking on the Cancel button will close the dialog box without applying the changes.
The user can toggle on the ‘Original Line’ option that will display the original profile in a different color to help the user see the effect of the proposed profile edits
The GeoFluv design made using Natural Regrade typically has many sub-watershed ridge and swale lines. The lines are 3D polylines and their profiles are generated from the user inputs (based on project area field work). The blue bar at the top of the Edit Longitudinal Profile pop-up dialog box will display the name of the line the user is viewing to supplement the visual dot-within-a-triangle that tracks along the line on the drawing. The Edit Longitudinal Profile command allows the user to make an irregular profile that can vary from a smooth convex to concave profile, for example when the user wants to make dips in a ridgeline profile to make saddle features. (Note: Because it can make irregular profiles it is not recommended for use on stream channels as knickpoints subject to erosion could be designed.)
The naming convention for the lines is to identify the sub-watershed, e.g., main L2R1 (note L and R are capitalized when identifying channels and their subwatersheds), followed by the sub-watershed ridge or swale line identification where lower case ‘r’ indicates a sub-watershed ridge line and a lower case ‘s’ indicates a sub-watershed swale line. The sub-watershed ridge or swale line letter is followed by a number indicating its sequential order from the head of the sub-watershed. Using this convention, the ‘main L2R1 r1’ designation identifies the first sub-watershed ridge on the right valley wall (r1) of the sub-watershed that holds the first tributary entering from the right valley wall (R1) of the second tributary entering from the left valley wall (L2) of the main channel.
Command Prompt:
Select objects:
Pulldown Menu Location: Natural Regrade
Keyboard Command: gfEditPro
Prerequisite: Design geofluv