Experimental data

Experimentally produced object 2.6

EPO2.6

ID3

LocationNorway

Approximate number of models23

Approximate size132 GB

Experimentally produced objects for the purpose of the TEMPA 3D project. Experiments were held in January and November 2024, and included engraving of soapstone from Rennesøy and Målslev and sandstone from Kamyana Mohyla. Experimentally produced objects were specifically designed to look at the technological traces of the surface modification processes via image-based 3D modeling.

Dataset includes 23 models of the experimentally produced objects. Among other this includes flint and quartz marks on soapstone, sandstone, bone, and antler as well as experimental replicas of Kamyana Mohyla churinga and soapstone line sinkers. For most engravings the modification time was recorded along with the production tool. The accuracy of the models in the dataset are around 0.1 mm, the resolution — around 0.03 mm.

Metadata

Material

Soapstone

Material of the surface modification tool

Flint

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Description of the object

A flat piece of the Rennesøy soapstone. Grinded on a sandstone slab. The stone was grinded and polished to make the surface as smooth and flat as possible. Engravings (sawed) were made to imitate "flint-like" negatives with the unknown material to cross-check experimental data. The microblade proved to be a very good material. It got blant quite soon, but due to the teeth-like blunting became even more efficient afterward.

Description of the tool

The tiny quartzite / mylonite microblade

Material source

Rennesøy, Rogaland, Norway

Current location

Arkeologisk Museum, Universitetet I Stavanger

Date of the experiment

07.11.2024

Experimental session ID

Experimental object ID

Actor name

Anja Mansrud

Type of surface modification 1

Sawing

Type of surface modification 2

Grinding

Type of surface modification 3

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Paradata

Data acquisition technique

Image-based 3D modeling

Data acquisition date

20/11/2024

Data acquisition equipment

Canon EOS D5s R, Zeiss Milvus, f/1.4, 50mm, extension ring 12mm, polarizing filter

Focal length

Aperture

1/31

ISO

200

Exposure

1 s

Image processing software

Adobe Photoshop

3D model creation software

Agisoft Metashape v. 1.8.1.

Capturing strategy

65 digital images in RAW format. 2 rounds of imaging with different object orientations: top and isometric (60 degrees). Sharp edges were acquired with additional precision. SfM photogrammetry, static camera within scenes, an artifact on the turntable, black background; scaled from calibrated metric scale bars. Remote shutter release.

Format of supplementary files

*.mtl
*.jpg

File format / 3D model

*.obj

Number of facets

2,748,824

Length of triangle side

0.035 mm

Referencing accuracy

0.009 mm

Measuring accuracy

0.009 mm