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Refresh Belgian training gap evidence
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2026-07-29 18:32:44 +02:00
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docs/BELGIUM_BUILDING_TRAINING_LOOP.md
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@@ -47,10 +47,14 @@ simultaneous gate.
## Current gap inventory ## Current gap inventory
The v4 dated corpus closes basic composition, leakage and temporal-identity The active v31 rotated-holdout corpus contains 142 independent AOIs and 26,041
gaps with 75 independent AOIs and 13,765 accepted building labels. It adds accepted source building labels. Its automated corpus audit has no failures:
coastal, ribbon-development, farmland, park, forest and additional urban spatial leakage is zero, temporal identity is explicit and 272 sub-resolution
contexts. Its remaining known gaps are: plus 393 post-imagery labels are rejected rather than silently trained. The
tile-quality audit records 51,244 visible training instances, zero invalid or
missing label files, zero low-variance positive tiles and 214 negative tiles.
It covers coastal, ribbon-development, farmland, park, forest, industrial,
rail, quarry and additional urban contexts. Its remaining known gaps are:
- dated 2025 imagery is used for Flanders and Brussels and the dated 2024 SPW - dated 2025 imagery is used for Flanders and Brussels and the dated 2024 SPW
campaign for Wallonia. Exact flight days remain a later metadata refinement, campaign for Wallonia. Exact flight days remain a later metadata refinement,
@@ -58,8 +62,13 @@ contexts. Its remaining known gaps are:
- GRB/PICC/UrbIS describe ground footprints, whereas visible roofs can remain - GRB/PICC/UrbIS describe ground footprints, whereas visible roofs can remain
displaced. The existing detector QA contract therefore uses IoU 0.25; the displaced. The existing detector QA contract therefore uses IoU 0.25; the
threshold is frozen and cannot be relaxed per candidate; threshold is frozen and cannot be relaxed per candidate;
- the first loop candidate generalises poorly in Flanders and Wallonia, - the active v38 loop still has to prove the frozen regional calibration gates;
especially Mechelen, Sint-Niklaas, Leuven, Mons and dense PICC areas; iteration 2 improved aggregate calibration F1 to 0.573 but remained below
the Flemish F1/precision/recall gates and the Walloon precision gate;
- Oostende coastal fabric is the dominant observed Flemish calibration
failure. Independent train-only coastal positives and port/dunes negatives
are therefore selected by the failure-driven sampler without opening or
copying protected calibration data;
- sparse hard contexts pass the empty-image test more easily than dense urban - sparse hard contexts pass the empty-image test more easily than dense urban
recall, so both gates must remain independent; recall, so both gates must remain independent;
- building boxes are a valid first detector contract, but footprint-perfect - building boxes are a valid first detector contract, but footprint-perfect
@@ -67,7 +76,7 @@ contexts. Its remaining known gaps are:
The active production model remains unchanged while any gate fails. The active production model remains unchanged while any gate fails.
The v31 expansion adds eighteen independent train-only AOIs after the v30 The v31 expansion added eighteen independent train-only AOIs after the v30
rotated-holdout calibration isolated the remaining domain gaps. Nine Flemish rotated-holdout calibration isolated the remaining domain gaps. Nine Flemish
AOIs cover industrial roofs, ribbon development and coastal urban fabric. Nine AOIs cover industrial roofs, ribbon development and coastal urban fabric. Nine
Walloon AOIs add dense urban, rural-town, regional-architecture and difficult Walloon AOIs add dense urban, rural-town, regional-architecture and difficult