Terrestrial or Static Laser Scanning
Each individual scan comes with its depth map, associating X, Y, Z data to each pixel of the panoramic image grid.
- The structured data contains each scan location, each panoramic image & depth map, and the 3D point cloud, as the result from the registration process.
- Each scan location is visible in the 3D space.
- It’s possible to be in each scan position, see the panoramic image and navigate from scan to scan.
- File size for each scan is big.
- Unified scans lose the ‘structure’ of the project.
- Scan positions are no more visible in the 3D view.
- Panoramic images are lost.
- Navigation from scan to scan is no more possible.
- The quality of the scan project is affected.
- Overall file size is slightly smaller, making the 3D point cloud somehow easier to consume in desktop modeling apps such as Revit for example.
Unstructured point clouds are generated from:
- Mobile Lidars
- Drone-based photogrammetry
- This data is ‘unstructured’ since there are no scan positions associated to a depth map as produced with laser scanners on a tripod.
- It’s pretty similar to a ‘unified’ point cloud.
Structured scan file formats
- (Structured) RCP: the native format for Autodesk ReCap projects
- (Structured) FLS: the native format for Faro Scene projects
- (Structured) E57: the standard exchange format for terrestrial laser scanning
- Every point cloud software provides the option to export a structured E57 file.
- Faro Scene, Trimble RealWorks, Leica Cyclone, Topcon ScanMaster…
- To know how to generate a structured E57 from these software, please ask us at: firstname.lastname@example.org
• There are other structured scan formats generated by point cloud software: FLS, PTX, TZF…
Structured-to-unified is possible.
- Every point cloud software provides the option to generate a unified point cloud.
- Turning a structured point cloud into a unified point cloud is a destructive operation though since the structure of the scan data is lost and the overall quality is affected.
- Typically, 2 formats are used:
- Unified RCS, making your scan data directly consumable by all Autodesk desktop apps.
- Unified E57
Unified-to-structured is impossible.
- Once the scan data has been unified, all the ‘structure’ data of the project is lost, making it impossible to recover it.
Thanks for your feedback.