Scan to CAD: The Modern Survey Method
In architectural and engineering projects, obtaining as-built documentation of existing structures is the most critical—and unfortunately most error-prone—stage of the design process. Traditional methods (tape measure, laser distance meter) are insufficient for complex and large structures. This is where **Scan to CAD (Laser Scanning to CAD Drawing)** technology comes into play.
Traditional Surveying vs. Laser Scanning
From an engineering perspective, when comparing both methods, the superiority of laser scanning becomes evident:
| Feature | Traditional Method (Manual Measurement) | Scan to CAD (Laser Scanning) |
|---|---|---|
| Accuracy | ±2cm - ±5cm (Cumulative error increases) | ±1mm - ±5mm (No cumulative error) |
| Data Type | Single points, sketch drawings | 3D Point Cloud (Millions of points) |
| Speed (Field) | 500 m² / Day (2 People) | 2,000+ m² / Day (1 Person) |
| Detail | Only measured areas are known | Everything is measured (No forgotten measurements) |
| Cost | Long field time, moderate office time | Short field time, longer office time (but efficient) |
How Does the Scan to CAD Process Work?
**Field Scanning
** The laser scanner device (Leica RTC360, etc.) is set up inside the structure and rotates 360 degrees to create a 3D copy of the environment.
**Registration
** Scans taken from different positions are combined into a single entity in office software.
**CAD Drawing
** The merged point cloud is imported into AutoCAD as a reference.
**Vectorized Drawing
** "Slices" are taken from the point cloud, and walls, columns, doors, and windows are drawn by tracing over them.
Why Should You Choose This Method?
1. Eliminate Error Margins
In traditional surveying, wall curvatures or angular deviations are often ignored, and rooms are assumed to be "rectangular." Laser scanning shows the actual form of the wall, plumb deviations, and irregularities exactly as they are. During implementation, you won't encounter surprises like "the furniture doesn't fit" or "the door doesn't seat properly."
2. No Need to Return to Site
After leaving the site, saying "we forgot to measure that area" becomes a thing of the past. Your point cloud is a digital twin of the site. You can take any measurement you need from your computer at any time.
3. Tall Structures and Facades
Facade details inaccessible without scaffolding, roof eaves, or high-ceiling industrial halls can be safely and accurately measured from ground level with laser scanning.
Conclusion
Scan to CAD is an investment that saves time, cost, and prestige, especially in renovation, restoration, and decoration projects. At Eos Proje, we process laser scanning data with the highest precision to produce clean, layered, and standards-compliant DWG files that architects and engineers can use.
To get millimetric surveys of your existing structures in CAD format, request a quote.