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Surface Borders

 

 

 

 

Each surface can have an optional border. The border defines the limits of a surface. Only the topo points that lie within the border are used to generate the surface. Those topo points that lie outside the border are not included. A border is always defined by a traverse.

As a result, the border affects the shape of the surface. You can edit the border so that its shape matches the physical surface you are modeling. The closer the border matches the actual shape in the field, the more accurate the contours, volumes and slope analysis.


Border Options

Leave the border unspecified. TPC will compute the surface as if you stretched a rubber band around it (called a convex border)

Select an existing traverse that defines the border you want.

Generate a convex border traverse which you can then modify by editing the traverse points.


Changing the Border Traverse

To change the border traverse used by a surface,

Right click any surface object in a drawing (a contour line or TIN line) and choose Surface Settings.

Left click the Surface tab.

In the Border Traverse section, expand the Traverse list and select the traverse you want to use as the border.

Choose OK to close the dialog. TPC will re-compute the surface using the new border.


Removing a Border

To remove a border from a surface, right click any surface object (a contour line or TIN line) and choose Surface Settings.

Left click the Surface tab.

In the Border Traverse section, choose None.

Choose OK to close the dialog. TPC will re-compute the surface using the new border.


Editing the Border

You can add points to the border and delete points from the border right inside the Drawing View. Editing the border graphically and with the Manual Re-compute toggle turned off lets you see the effects of your changes as you make them. This is a great way to refine the border shape and resulting surface.

Right click any surface object in a drawing and choose Surface Settings. Make sure you have a border traverse selected. In the Advanced tab, turn off the Manual Recompute toggle and choose OK. This forces the contour to regenerate itself each time you select a point in or out of the border.

Right click any surface object and choose Surface Tools | Edit Border.

To include a point in the border, left click it. To remove an existing border point from the border, left click it. It sounds too simple, but try it and you’ll get the hang of it right away. Each time you select a point in or out of the surface border, the surface regenerates itself, showing you the effect of the change.

When you are finished editing the border, right click or press Enter to end the command.

Once you have the surface the way you want it, return to the Advanced tab and turn of the Manual Recompute toggle.


Related Topics

Surface
TIN and Breakline Settings

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