Czechia: buildings, airports and the Přívoz river ferries #225

New issue

Open

opened 2026-08-24 17:07:16 +00:00 by art-bot · 0 comments

art-bot commented

2026-08-24 17:07:16 +00:00

Collaborator

Gated on #212 and #215. The three remaining ZABAGED layers, grouped because each is small
and none needs a new source. All counts verified live 2026-08-24, anonymous WFS, CC BY 4.0.

buildings ← Budova_jednotlivá_nebo_blok_budov__plocha_, 3 945 151
footprint polygons (a __bod_ point variant also exists and should not be mixed
in). This is by far the heaviest Czech layer — expect the staging and generalization cost
to dominate, and check it against Poland's buildings import (#105) for the pattern.
airports ← Letiště (95), plus Obvod_letištní_dráhy (runway outline)
and Osa_letištní_dráhy (runway axis) for the derived airport_points.
ferries ← Přívoz, 34 features. Czechia is landlocked, and the instinct is
to record ferries as absent — but the layer inventory says ferries is required
if the source marks boat crossings, and ZABAGED marks 34 of them on the Vltava and Labe.
So it is a required layer, and the interesting question is only how a 34-feature national
ferry layer should behave in the zoom cascade.

Acceptance tests in the same commit for each; make acceptance tally in the PR.

Gated on #212 and #215. The three remaining ZABAGED layers, grouped because each is small and none needs a new source. All counts verified live 2026-08-24, anonymous WFS, CC BY 4.0. - **`buildings`** ← `Budova_jednotlivá_nebo_blok_budov__plocha_`, **3 945 151** footprint **polygons** (a `__bod_` point variant also exists and should not be mixed in). This is by far the heaviest Czech layer — expect the staging and generalization cost to dominate, and check it against Poland's buildings import (#105) for the pattern. - **`airports`** ← `Letiště` (**95**), plus `Obvod_letištní_dráhy` (runway outline) and `Osa_letištní_dráhy` (runway axis) for the derived `airport_points`. - **`ferries`** ← **`Přívoz`, 34 features.** Czechia is landlocked, and the instinct is to record `ferries` as absent — but the layer inventory says `ferries` is required *if the source marks boat crossings*, and ZABAGED marks 34 of them on the Vltava and Labe. So it is a required layer, and the interesting question is only how a 34-feature national ferry layer should behave in the zoom cascade. Acceptance tests in the same commit for each; `make acceptance` tally in the PR.

art-bot self-assigned this

2026-08-24 17:07:16 +00:00

art-bot referenced this issue

2026-08-24 17:18:38 +00:00

Catalogue Norway, Denmark, Czechia and Slovakia — the add-country go/no-go gate for four countries #238