Geometric Control

Introduction

Geometric control is part of the Gemini Terrain+ base package. With this functionality, contractors can document quality of execution. Measured points can be compared with projected discipline models to document that the object is built as designed and within tolerance requirements. We perform geometric control in the drawing with the discipline model that we want to check.

Geometric control in Gemini Terrain includes:

1. Geometric control of points with point measurements
2. Geometric control of lines with point measurements
3. Geometric control of triangle network and polygon with point measurements
4. Geometric control of road and tunnel with point measurements
5. Geometric control of triangle network with point cloud

Common to the first four controls is that we compare measured points against theoretical points. The theoretical points can be calculated from line and surface according to the criteria vertical or normal to.

Info

For all controls, we must import measured control points or scan data to an application layer.

The program has three templates for geometric control with point measurements that we can use when creating the application layer:

1. Geometric_control
2. Geometric_control_tunnel
3. Geometric_control_road

The functions for geometric control with point measurements can be found on the right mouse button in the horizontal list field for Points:

The functions for geometric control with point measurements can be found on the right mouse button in the horizontal list field for Points**

The function for geometric control with point cloud can be found in the horizontal list field for Point cloud:

The function for geometric control with point cloud can be found in the horizontal list field for Point cloud.

Control Results

Horizontal List Field

After the control is performed, the program outputs the result of the calculation in the layer with measured control points. Common to all controls is that columns for the vector deviation and the components in DX, DY, and DZ are created in the horizontal list field.

Graphic Representation

We can set up the graphic representation of the result ourselves. However, an application layer template has been created for geometric control with a presentation rule for the deviation in plan and 3D view. The template uses the presentation rule Vector.

This rule retrieves the vector deviation from the horizontal list field so that all deviations can be presented with real values. With this rule, we can also display the vector deviation in render if desired.

We refer to the dialog help for the presentation rule for a more detailed description of the various possibilities.

Report

We also get a dedicated Excel report for each control.

Note

The following chapters describe the different methods in detail. Note that an annotation function for cross sections is also part of this module. It is useful, among other things, to show deviations between different layers in the cross section.