The thicknessMm field captures how thick an object is in millimeters, completing the three-dimensional metric description that begins with lengthMm and widthMm. Thickness is especially diagnostic for items like ceramic sherds, lithic bifaces, and worked bone. The field is optional, so unmeasured or bulk finds can leave it blank. Because it is stored as a decimal, it preserves fine precision. Recording all three dimensions consistently keeps the catalog ready for typological sorting and statistical analysis.
Technical section
Data model, API, and internals — visible to developers.