Define
End Areas(This functionality is available with the Profiles and Design module)
Defines the end areas of displayed cross section sets.
The Volumes/Define End Areas command is selected from the Profiles task in the cross section view. This command displays the Define End Areas dialog box.
This dialog box is used to establish:
- Whether or not a closed surface or a two section end area determination is to be performed;
- Which sections are to be used in the determination of the end area;
- Whether holes in a section surface should be treated as if they were connected by line segments;
- Which rules are to be applied to define the outer extents of the end area intersections and the order in which these rules are to be applied.
The end areas formed can be viewed in the cross section window by shading. This option can be toggled off or on by selecting the Display End Areas button on the dialog box or via the Display/End Areas command.
Define End Areas Dialog Box
| Item | Used to |
| Define End Areas By: | |
| Do Not Form End Areas: | Turn off the defined end areas. |
| Single Surface: | Select a surface to be used for the determination of end areas. If a single surface is selected then each section will be checked for closure and none of the Surface Intersection Rules will apply. |
| Two Surface: | Select two surfaces to be used for the determination of end areas. |
| To Surface: | Select a cross section set. This list contains all cross section sets open in the current cross section view. |
| Check surface for closure: | Check the selected "To Surface" for closure. |
| From Surface: | Select a cross section set. This list contains all cross section sets open in the current cross section view. |
| Check surface for closure: | Check the selected "From Surface" for closure. |
| When computing end areas using two surfaces if the "to" surface is above the
"from" surface the area contained is classified as fill. If the "to" surface is below the "from"
surface the area contained is classified as cut. Internal Holes |
|
| Connect across holes in surface: | Treat any gaps in the surface as if a line segment connected them. If the user has asked that a section be "Checked for closure" then it is assumed that the region is supposed to close. If the section does not close this is not to be treated as an internal hole in the surface. If this occurs the end area will not be able to be computed. |
| Do not incorporate holes into end areas: | Treat gaps in the cross section line string as a break in the section surface. Note that choosing this option will result in the end area not forming if the surface intersection rules include this part of the surface. |
| Display End Areas: | Display the end areas. This option can also be toggled off or on by selecting Display/End Areas command in the cross section view. |
| Surface Intersection Rules Rules are used to determine how the outer extremities of the end areas are to be defined. One or more of these rules can be selected and the order of priority in which they are to be applied. A rule is set to 0 if it is to be disabled. At least one rule must be set. The number indicates the order in which a rule will be applied. When the rules are applied they are applied independently to the left and right sides of the cross section surfaces. Each side is tested rule by rule until it meets the requirements of the rule being applied. For each rule the left hand side of the section is tested first then the right hand side. The exception for this testing is the "Stop at first intersection point past" rule, where the left hand side and the right hand side of the centre line is tested. If it is not possible to find a rule that complies then no end areas will be created. The shortest section is dependent upon which side is being tested. When testing the left side the section with the smallest left most offset will be considered to be the shortest section. Likewise on the right the section with the smallest right most offset will be considered to be the shortest section. Hence the same section does not have to be the shortest section on both the left and right side. |
|
| Stop at outer intersection limit: | Restrict the end areas to intersections between two surfaces. |
| Stop at first intersection point past: | Search to the left of Offset 1 and the right of Offset 2 for the first intersection between the surfaces that it comes to. |
| Offset 1: | Enter the offset where the search for an intersection will begin. The search will move to the left of this offset until an intersection is found or the cross section ends. |
| Offset 2: | Enter the offset where the search for an intersection will begin. The search will move to the right of this offset until an intersection is found or the cross section ends. |
| Project section along end grade: | Project the end segment of the shortest cross section to intersect the other cross section. If the projection of the shortest cross section extends past the end of the longer cross section then the longer cross section will also be projected. |
| Distance 1: | Enter the distance where the cross sections will stop projecting to the left. This is defined as the slope distance taken from the shortest section. |
| Distance 2: | Enter the distance where the cross sections will stop projecting to the right. This is defined as the slope distance taken from the shortest section. |
| Apply square cut at section end: | Apply a vertical line that starts at the end of the shortest section and intersects the longer section. |
| Apply square cut at: | Apply a vertical line that intersects both sections at a user defined offset. |
| Offset 1: | Enter the offset at where the square cut will be applied to the left side of the cross sections. |
| Offset 2: | Enter the offset at where the square cut will be applied to the right side of the cross sections. |
| OK: | Close the dialog applying the current settings. |
| Cancel: | Close the dialog without applying the changes. |