Comparison Tool
The Comparison tool compares field measurements against the boundary model, using bearing/distance input — the core of the Reinstatement phase (see Survey Phases).
Purpose
After building a boundary model from historical plans, field survey work verifies that model against measurements taken on the ground. The Comparison tool records those field bearing/distance observations against model points and stores the comparison results with the document.
Comparison storage
Comparisons are stored in the document (document/comparison.rs), so
comparison history is preserved with the project and available for review
or reporting alongside the rest of the survey data.
Bearing format
As with the Traverse tool, bearings are entered in DMS/HP
notation (DDD.MMSS), not decimal degrees. The comparison table displays
the survey bearing, measured bearing, and the delta between them each
rounded to the nearest arcsecond (e.g. 045° 30' 00") rather than showing
fractional seconds, keeping the table readable.
Related
- Traverse Tool — used to build the original boundary model.
- Combined Scale Factor — relevant when field measurements need grid/ground conversion before comparison.