Kadaster parcels: is it worth wiring in? #189

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viberfox-agent merged 1 commit from docs/187-kadaster-parcels-not-taken into main 2026-08-29 19:17:32 +00:00
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Closes #187

Merged by the autopilot (docs/direction.md) after every Actions job passed on the branch head.

Closes #187 Merged by the autopilot (docs/direction.md) after every Actions job passed on the branch head.
The frontier row promised "plot boundaries -- the gardens between the
buildings". Both halves are wrong, and the check that shows it is worth
keeping so nobody repeats it.

The interface and the licence were both fine. WFS 2.0 at
service.pdok.nl/kadaster/kadastralekaart/wfs/v5_0 with five feature types
and a daily bulk download beside it; CC0 1.0 and no fees, read off the
service's own ows:AccessConstraints rather than a wiki. As with NWB, this
lost on content.

Value 1, "Measured beats plausible", is what settles it. A cadastral
boundary is a legal line, not a physical object, and the physical ones --
fences, walls, hedges -- are already surveyed by the BGT and already drawn
as LineKind::{Fence,Wall,Hedge}. Over the Groningen box: 312.4 km of
cadastral boundary against 21.9 km of surveyed boundary. Drawing the
cadastre would stand ~290 km of invented fence per cell where the register
says nothing at all, which is the exact inversion of that value. The
gardens the row wanted are the BGT's begroeidterreindeel, i.e. the "BGT,
the remaining layers" row, which keeps its own place unjudged.

Volume seals it independently: Perceel alone is 8,855 features and 14.0 MB
per cell, 3.7x the paving layer's densest cell.

The note also records four paging traps -- a cumulative numberMatched, a
short page that is not the last page, resultType=hits as the only honest
total, and PagingIsTransactionSafe=FALSE returning 8,855 features of which
8,638 are unique -- because anyone reaching for this service will meet
them, and they are worse than the BAG WFS truncation CLAUDE.md warns about.

Docs only; no crate is touched.

Refs #187
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