What needs to be clarified
Reproduce the photogrammetric calculation, verify the reference dimension and geometric assumptions, and assess whether the source data support the stated dimensional precision.
Materials to prepare
- Report with measurement points and intermediate calculations
- Full-resolution original photographs and lens information
- Ruler information, object placement and independent check dimensions
What to compare
Check ruler-to-surface position, perspective, distortion and boundary visibility. Repeat point selection and compare reasonable markings and corrections. Without justified plane reconstruction, do not use one pixels-to-length factor; validate precision using an independent dimension excluded from model fitting.
Possible outcome of the analysis
A reproducible calculation, sensitivity assessment and unsupported-assumption list may be provided; confirming a precise dimension may require new photographs or direct measurement of the object.
Limits of the conclusions
Enlargement adds no source detail. Hidden damage boundaries cannot be recovered by review; unsuitable scale and geometry may make a numerical conclusion technically unresolved.