Fit Geometry Components
Preliminary draft
Note Lite, Not UAV, Not Spatix
This is an introduction to the Fit Geometry Components tool in TerraScan. The tool can be use to find a road geometry by fitting its components to the points found in a line string. The application can generate horizontal and vertical road geometries. Normally, the horizontal geometry is solved first. The work on the vertical geometry only starts after the horizontal geometry has been finalized. A normal overall workflow in this case is:
1. Create a filtered survey vector.
2. Find preliminary horizontal geometry.
3. Modify the horizontal geometry.
4. Find preliminary vertical geometry.
5. Modify the vertical geometry.
6. Export your work.
However, if the horizontal geometry is not required, it is possible to start working on the vertical geometry once the filtered survey vector has been created. In this case the workflow is:
1. Create a filtered survey vector.
2. Find preliminary vertical geometry.
3. Modify the vertical geometry.
4. Export your work.
The modifications to the geometry components are stored in the CAD file. The saved components can be used to continue working on the geometry at a later point of time. The application also supports saving the geometry components into a text file in a proprietary file format. The vertical and horizontal geometries are saved into separate files. The application can then import geometries from files that are in its proprietary file format. Finally, the geometry components can be exported into selected exchange formats, such as simplified LandXML among others.
Content of this Chapter
This Chapter describes the recommended steps for producing the horizontal and vertical geometries. The first step in the generation of a road geometry is the filtering of the input survey vector which is described in Section Survey / Filter survey vector.
The generation of a horizontal geometry and the options for working with its components are discussed in Sections Horizontal / Create geometry and Modifying the horizontal geometry.
The generation of a vertical geometry and commands for working with its components are introduced in Sections Vertical / Create geometry / From horizontal components, Create geometry / From line string, and Modifying the vertical geometry. The commands for modifying vertical geometry components appear identical to the ones used for horizontal geometry. The main difference is:
•the horizontal geometry is compared to the filtered survey vector.
•the vertical geometry is generated using the elevation values of the filtered survey vector and the station values calculated using the horizontal geometry.
Section Activate an existing geometry shows how to continue with previously created geometries.
Section Tools for component modification provides detailed description of the commands for modifying the geometry components. Finally, all other commands included in the component fitting application are introduced in Section Other commands.
