Reference
Quality words
The four words that say how far to trust a missing-concrete figure — Good, Fair, Indicative and Not measurable — and how such figures are written.
Every missing-concrete figure from the 3D defect tool carries one of four words. The word describes the measurement, not the condition of the concrete.
| Word | The figure may be out by | What you can do with it |
|---|---|---|
| Good | up to 15% | Solid. Read the number as measured |
| Fair | up to 35% | Close enough to act on. Treat it as approximate |
| Indicative | up to 60% | A rough size only. Use it to compare, not to quote |
| Not measurable | more than 60% | No figure is printed. The concrete here is too rough, or too poorly captured, to put a number on |
The word appears beside the figure in the Measurement panel, in the PDF report and in the CSV (column defect_confidence). The report’s total of missing concrete combines the uncertainties of its parts and carries its own word.
How the figure is written
Section titled “How the figure is written”- Rounded to what the measurement supports. The figure is written to the digits it can back — “60,000 cm³”, not “61,347 cm³”. The word carries the rest.
- Never with a ± sign. The size of the uncertainty is in the CSV (
defect_uncertainty_cm3) for anyone who needs it. - In the unit that suits its size. cm³ below 1 m³, m³ from there.
What decides the word
Section titled “What decides the word”The roughness of the sound concrete around the damage decides it more than anything else. A finer sampling grid changes little; tracing the outline round a smoother patch of intact concrete changes a great deal.
Other measurements
Section titled “Other measurements”Volumes against a base surface, and depth profiles, do not carry a quality word. A volume carries the base it was measured against and the grid it was sampled on; a depth profile carries its resolution. See About measurement accuracy.