📦 WP-057 — feat(data): 1024 px overlapping crop tiling¶
Research log · Phase 8 — Oriented detection, v0.3.0
WP-057 — tiling is what creates difficult instances¶
DOTA ships a per-object difficult flag and WP-056 declined to decide its fate at load, deferring to A39. Tiling is where that deferral turns load-bearing: R18's partial-object rule flags an instance difficult when its clipped area falls below 0.7 of its original, so the tiler manufactures difficult instances the source annotations never carried. A39 therefore governs a population that DOTA's own flag column does not describe, and the number the decision was made from has to survive the crop — which is why U is carried out as visible_fraction rather than consumed and discarded.