Settle the lower tail of flying_height per roll from the logbooks (#60)

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Summary

• The lower tail of flying_height is settled per roll. The 1,962 frames FLYING_HEIGHT is 10.764x too large on 1,589 catalogue frames, so fly_footprint(dem =) sized them at 110 km #54 left "implausible" are 42 rolls with one round-feet height each, so 77 roll-heights. Two witnesses independent of the disputed fields settle 22 of them (1,001 frames):
  • adjacent-frame spacing against the ~60% designed overlap, checked on known answers first;
  • the province's scanned flight logbooks, transcribed with three control rolls' catalogue values withheld.
• What the 22 were. Ten dropped a digit, one dropped two (bc7280, catalogued at 60 m and flown at 20,000 ft). Eleven have the right height beside a wrong scale, so FLYING_HEIGHT is 10.764x too large on 1,589 catalogue frames, so fly_footprint(dem =) sized them at 110 km #54's fallback to nominal scale was drawing them 2–10× too wide.
• Runtime. fly_footprint(dem = ) now reads inst/extdata/flying_height_rolls.csv, keyed on roll + height + lens + scale, and marks those frames height_source = "corrected_roll_table". The height used is the logbook's, converted.
• Nothing left silent. Every other lower-tail roll-height ships in flying_height_rolls_excluded.csv with its reason (55, 961 frames).

Related Issues

• Closes ~2,000 film frames carry a FLYING_HEIGHT far too small, and three remedies fit equally #60
• Two findings outside this issue were filed rather than acted on:
  • fly#54's ÷10.764 looks like ÷10 on the pre-2000 slipped rolls #71: FLYING_HEIGHT is 10.764x too large on 1,589 catalogue frames, so fly_footprint(dem =) sized them at 110 km #54's ÷10.764 looks like ÷10 on the pre-2000 rolls (logbook control bc78065: 1,350 ft logged, 13,500 ft catalogued).
  • Half the r≈2 mass is a wrong scale, not a mislabelled lens, and the fallback draws it at half width #72: half the r ≈ 2 mass has a wrong scale, not a mislabelled lens.

Test plan

• devtools::test(): 2,279 passed, 0 failed.
• test-fly_footprint_height_rolls.R:
  • holds the table and the excluded list to the shipped sweep (an exact partition of the 1,962; every r_corrected recomputed);
  • each of seven restored defects turns it red.
• R CMD build: creating vignettes ... OK; both CSVs ship; data-raw/ and planning/ do not.
• /code-check, three rounds, eight findings fixed:
  • Round 3 found a defect inside round 1's fix, so a quiet round could not end the loop.
  • It ended on an enumeration instead: all 77 shipped labels were re-derived from the per-frame logbook states by an independent predicate, and all 77 agree.

Notes

• The fly#60 section of inst/notes/terrain-correction.md covers method, controls and bounds. Spacing cannot tell ×10 from ×10.764; the logbook can.
• data-raw/height_calibrate-lower_tail_rolls.R reproduces every figure. data-raw/flying_height_logbooks.csv is the hand transcription.
• The table is consulted on the DEM route only. Without dem, a wrong-scale frame is still sized from its scale.
• v0.15.0.

🤖 Generated with Claude Code

https://claude.ai/code/session_0115csb82i78r86GWFzwPzis