Synopsis

The work addresses the increasing need for concrete repair in Germany, noting that traditional paper-based or fragmented digital processes often lead to "media discontinuities" and redundant data entry. To solve these inefficiencies, the author uses BPMN (Business Process Model and Notation) to analyze existing workflows and design a target digital process that centers information in a building model. A practical experiment conducted in an underground car park validates the feasibility of using mobile devices for professional-grade digital surveying.

Summary of Findings

The thesis concludes that a consistently digital process can significantly increase project throughput and employee productivity without requiring more working hours.

• Process Improvement: Digitalization reduces the risk of information loss during long project intervals and allows different employees to use the same central model across all phases.

• Mass Accuracy: Digital inventory prevents mass estimation errors often caused by outdated or inaccurate original building plans.

• BIM-to-AVA Integration: Using 3D models allows for a seamless transition to bidding and award software (e.g., CaliforniaX), avoiding manual transfer errors.

• Enhanced Communication: Visual 3D models improve acceptance and understanding for owners (who are often laypeople) compared to dense text-based reports.

Recognized Benefits of Dot3D

After comparing several mobile applications—including Polycam and Scaniverse—the study identifies Dot3D as the superior choice for professional engineering applications.

1. Geometric Stability and Precision

While Polycam frequently lost references and Scaniverse struggled with incorrect component placement in large spaces, Dot3D provided a consistently stable geometry. The study achieved measurement accuracies of up to 1 mm for reference routes when using recommended accessories.

2. Advanced Targeting with AprilTags

A key differentiator for Dot3D is its integrated support for AprilTags—identifiable markers that serve as landmarks for the software.

• Loop Closure: Automatically optimizes accuracy by identifying consistent positions when targets are re-scanned.

• Referencing: Allows users to manually enter pre-measured distances between tags to further stabilize the model.

3. Integrated Documentation Tools

Dot3D allows for the direct placement of annotations, photographs, and measurements within the 3D point cloud. This enables a "Scan-to-BIM" workflow where the captured data serves as both a geometric base and a permanent digital archive of defects.

4. Professional Data Exchange

Unlike simpler apps focused on 3D meshes for visual use, Dot3D focuses on high-quality point clouds and supports the .e57 neutral standard format, which is essential for further processing in professional CAD and authoring software like Revit or Archicad.