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Section 3. Archiving Laser Scan Data#

3.2 Acquisitional Metadata #

Acquisitional metadata is divided into two levels, Project level metadata and Scan level metadata. Both project and scan level metadata should accompany the archival of the original scan datasets. The specifications provided by English Heritage (2007) are the basis for the metadata standards listed below. Additional specifications not listed in the English Heritage document are also suggested.

The project level metadata is the information needed to completely document a single scan project. A project will typically include multiple scans over a definable object or coverage area. For example, if two separate monuments/structures are scanned at a site then each monument will have its own project level metadata. Scan level metadata is information collected that pertains to each unique scan within a project. Most of the metadata entries are self explanatory however additional descriptions may be included where deemed necessary.

3.2.1 Project Level Metadata

Project Name
Name of monument, survey area, or object
Monument/Object NumberThe ID number or code, if applicable, of the
Survey Location
Survey Date(s)
Survey ConditionsThe overall weather trend during survey (sunny, overcast, indoors, etc.)
Scanner DetailsDetails of the instrument(s) with serial number(s) and scan units
Company/Operator NameDetails of company and/or scan operator
Control data collected?If yes, then list control_file_name.txt.
Turntable used?Yes/No
RGB data capture?If yes, then specify whether:
- Internal or external?
- Was an additional lighting system used? If yes, then provide a brief description of the lighting system.
Estimated Data ResolutionThe estimated data resolution across the monument or object.
Total Number of Scans in Project
Description of final datasets for archive
Planimetric map of scan coverage areasIf applicable then provide the relevant image name.
Additional project notes
Images from surveyOptional, if yes, then provide the image file names

3.2.2 Scan Level Metadata

Scan FilenameThe name of the scan. A suggested filename for original raw scans for archiving is in this format: ProjectName_scan1.txt.
Name of monument/object area
Survey Date
Scan NumberThe number of the scan in scan sequence e.g. 3 of 18.
Number of Points in Scan
Additional Scan Notes
Scanner TechnologyTOF/Phase/Triangulation
Data ResolutionThe data resolution at specific range.
First or Last Return (TOF scans only)
Frequency Settings (Phase scans only)
Noise Settings (Phase scans only)
Camera Exposure Settings (If RGB acquired)(Phase scans only)
Lense or FOV Details (Triangulation scans only)

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