A survey can include any number of surfaces just like it can have any number of traverses or drawings. Surfaces can be added, deleted, duplicated, edited and displayed in drawings using Surface Settings.
Multiple Surfaces in a Survey
Having multiple surfaces opens the door to work with existing vs proposed surfaces, volumes between surfaces, cut/fill reports between surfaces and much more.
Here are some examples of how you might use multiple surfaces. See Multiple Surfaces.
•If you are surveying stockpiles of crushed rock, you can have a surface for the 1" minus pile and another surface for the 3" minus pile. Each surface can compute the volume of rock in the pile.
•You can survey an excavation site each month to determine the quantities removed.
When you create a surface in TPC, you specify the topo points to include in the surface. You can choose from
•all the topo points in the survey
•all the selected topo points
•all the topo points in a traverse
You manage surfaces in the Surfaces Manager dialog. You can create new surfaces, duplicate or edit existing surfaces and remove surfaces from the survey.
Including Surfaces in Drawings
To include a Surface in a drawing just tag it in the Surfaces Manager. TPC will include the surface in the current drawing using the default surface settings. You might draw the major and minor contour lines for the surface or shade in the slopes.
You can include more than one surfaces in a drawing. You might use multiple surfaces to show different phases of an excavation or different stockpiles in a rock quarry. See Multiple Surfaces.
Editing (Modifying) Surfaces
You edit or modify the TIN by adding or removing points, adding breaklines and defining an optional border. All of these actions change the shape of the Surface. Some times the topo points alone are adequate to accurately represent the physical surface. Some times adding a few breaklines is all you need. You'll find that there is some skill involved in collecting the best points in the field to accurately model the surface back in the office. See Editing Surfaces.