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Defining the Hull Properties

LP360 Support
  • Updated
QCoherent Software, LLC

 

Hull Property Page

About the Hull Property Page

The hull is one of two surfaces involved in a Volumetric computation. The volume between the hull and base surfaces is the primary output of a Volumetric Analysis. The Hull property page allows you to define the layer and points in the layer that will represent the hull surface in the volume computation.

Hull Perimeter (3D Polygon Boundary) – Specifies the circumscribing polygon for the hull surface. Click the button to display I/O Manager with the Hull Input Polygon enabled for editing. If the Volumetric Analysis 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 Analysis task is not part of one of the Default Volumetric macros, the 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 hull surface circumscribing polygon must be 3D). The Feature Layer and Feature Layer Indirect Tools can be used if the map contains 3D shape layers.

Hull Interior (Surface Generation Method) – Specifies how to generate the hull 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 hull perimeter.)
  • Use Polygon Only builds a TIN model using only the specified hull 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 Hull Properties

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

  1. Set up a Volumetric Analysis task.

  2. Click the Hull tab in the Point Cloud Task window.

  3. Define the perimeter of the Hull by selecting Use base polygon, which uses the same polygon as defined for the base in the Base tab, or by defining a 3D polygon boundary using either tool geometry or an external file containing definitions. To define a 3D polygon boundary, 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 hull 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 Analysis task).


    • SHP Layer - a shape file defining the polygon to use.


    • File - other file that contains the polygon definition to use.


  5. On the Hull tab, in the Surface Generation Method drop-down menu, select the method to use for generating the hull 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 Hull perimeter (specified in the 3D Polygon Boundary).


    • Use Polygon Only - builds a TIN model using only the specified hull perimeter polygon vertices and Breakline Enforcement.


    • Constant Z - a constant (flat) elevation specified by the Constant Z value.


  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.

 

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