Base Property Page

Base Perimeter (3D Polygon Boundary) – Specifies the circumscribing polygon for the base surface. Click the button to display I/O Manager with the Base Input Polygon enabled for editing. If the Volumetrics task is part of one of the Default Volumetric macros, the only option is to specify a file path (a Conflate task in the macro will generate this shapefile with the conflated polygon). If the Volumetric task is not part of one of the Default Volumetric macros, I/O Manager will let you select either 1) Tool Geometry, 2) SHP Layer, or 3) File. If Tool Geometry is picked, bear in mind that only the Feature Layer and Feature Layer Indirect tools can be used because the other tools generate 2D geometries (the base surface circumscribing polygon must be 3D). The Feature Layer and Feature Layer Indirect Tools can be used if the map contains 3D shape layers.

Base Interior (Surface Generation Method) – Specifies how to generate the base surface. 

• Use LAS Points builds a TIN model from the specified Input LAS Points Layer using the specified Point Filter and Breakline Enforcement.  (Note that the TIN model includes and is bounded by the specified base perimeter.)
• Use Polygon Only builds a TIN model using only the specified base perimeter polygon vertices and breakline enforcement.
• Constant Z specifies that the surface is simply flat at a constant elevation specified by the provided Constant Z Value.

How To Define Base Properties

This set of steps will define the circumscribing polygon and determine how the base surface will be generated.

1. Set up a new Volumetric Analysis task.
   
   
2. Click the Base tab in the Point Cloud Task window.
   
   
3. Click the browse button next to the 3D Polygon Boundary field. This will display the I/O Manager.
   
   
4. In the available drop-down menu under Type, select the method that will define the base polygon boundary. The available options are
   
   
   • Tool Geometry - allows you to specify the circumscribing polygon via the Feature Layer or Feature Layer Indirect tools (the 2D drawing tools are disabled for a Volumetric task).
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   • SHP Layer - a shape file defining the polygon to use.
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   • File - other file that contains the polygon definition to use.
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5. On the Base tab, in the Surface Generation Method drop-down menu, select the method to use for generating the base surface.
   
   
   • Use LAS Points - builds a TIN model from the specified Input LAS Points Layer using the specified Point Filter and Breakline Enforcement. Note that the TIN model includes and is bounded by the specified Base perimeter (specified in the 3D Polygon Boundary).
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   • Use Polygon Only - builds a TIN model using only the specified base perimeter polygon vertices and Breakline Enforcement.
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   • Constant Z - a constant (flat) elevation specified by the Constant Z value.
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6. IF you selected LAS Points as the surface generation method, click the browse button next to the Input LAS Points Layer field to open the I/O Manager. In the Map Layer drop-down menu, select the layer to use. Close the I/O Manager.
   
   
7. IF you selected Constant Z as the surface generation method, enter an elevation value in the Constant Z field.
   
   
8. To use Breakline Enforcement, click the Breakline Enforcement button. In the dialog that opens, specify Breakline Enforcement properties to use and click OK. See Breakline Enforcement Property Page for more information.
   
   
9.  Click Apply at the bottom of the window to continue.