The feature surface element is used to define a complex surface specified by outlines, contours, break-lines and points. This element
is most commonly used for take-offs such as those needed by contractors for bidding purposes.
The properties that are exposed for this element are summarised below.
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Define
This is the way that the surface levels should be defined. Options are 'levels' which uses the levels specified without
modification, 'levels & offset' which applies an offset
to the levels specified. The offset option is mostly used to add construction thicknesses by specifying a negative
offset. Lastly a 'levels & 3d offset' option allows the
surface to be adjusted in X and Y as well as in Z.
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Offset
This option is only visible if offset options are selected in the 'Define' menu. It allows you to offset the entire
surface in X,Y and Z. This is useful for accommodating for a construction thickness of finding a balance.
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Features
The edit button will open the take-off window so that you can defined the outlines, contours, break-lines and points which define
this surface. For more information on the options available in the take-off window see
Feature Surface
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Mode
This is used to specify if the surface should have cut, fill or both. Most commonly cut and fill will be specified.
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Side Batter
The feature surface boundary is joined to the ground by side slopes. The side batter (set as a ratio of vertical to horizontal)
dictates the angle of these slopes. You can set differet side batter angles for side slopes that cut into
the ground and for those that fill into it. Turning side batter off will result in the feature surface being joined to the
ground with vertical sides.
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The following video tutorials relate to this topic :
[1] Proposed Earthworks : The Surface Element : A
video which demonstrates how to easily produce estimates for any proposed earthworks defined by survey points, contour lines and break lines.
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