dim_corners

One row per race × circuit turn: the telemetry distance window each corner owns, derived from FastF1’s own corner table (stg_circuit_info) rather than maintained by hand.

Part of the Reference family.

One row per race × circuit turn: the telemetry distance window each corner owns, derived from FastF1’s own corner table (stg_circuit_info) rather than maintained by hand. Windows run from the apex minus corner_entry_margin_m to the apex plus corner_exit_margin_m, each end clipped at the neighbouring apex, so consecutive corners overlap only in the stretch between them which is both the exit of one and the approach to the next. Keyed per race because FastF1 publishes geometry per event and venues re-profile mid-history; a race whose corner table is missing borrows the nearest season of the same event slug and says so in geometry_source.

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Lineage

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Overview

Property	Value
Layer	reference
Family	Reference
Contract enforced	No
Upstream	stg_laps, stg_circuit_info, dim_circuits

14 tests guard this model - 13 generic, 1 singular.

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Columns

Column	Type	Nullable	Tests	Description
corner_key	varchar	Yes	not_null, unique	PK, race_id || ’_’ || corner_name.
race_year	integer	Yes	not_null	Season year of the race the window applies to.
race_id	varchar	Yes	not_null	Numeric FastF1 event id, the join key into stg_telemetry.
track_id	varchar	Yes	not_null	Event slug for the race (bahrain_grand_prix). Carried through int_corner_metrics as a label; nothing in this model pools across slugs.
circuit_id	varchar	Yes		Physical-circuit identifier from dim_circuits. Several event slugs can share one circuit_id (renamed events, double-headers), so it is non-unique here.
corner_name	varchar	Yes	not_null	Turn label, ‘Turn_’ || corner_number || corner_letter (e.g. Turn_7, Turn_7A).
corner_number	integer	Yes	not_null	FastF1 corner number, ordered by distance along the lap.
corner_letter	varchar	Yes		Suffix FastF1 uses where one numbered turn has several apexes; NULL otherwise.
apex_distance_m	double	Yes	not_null	Distance of the corner apex from the start line, on the same reference as stg_telemetry.distance_m. Validated against the measured speed minimum on slow corners (median offset 2 m).
start_distance_m	double	Yes	not_null	Window start: apex − corner_entry_margin_m, floored at the previous apex and at 0. Wide enough to contain the braking zone on corners with a clear approach.
end_distance_m	double	Yes	not_null	Window end: apex + corner_exit_margin_m, capped at the next apex so a corner never reaches past its neighbour.
geometry_race_id	varchar	Yes	not_null	Race whose FastF1 corner table produced this window (self, or the borrowed session).
geometry_source	varchar	Yes	not_null, accepted_values	’session’ where the race has its own corner table, ‘nearest_season’ where it borrows the closest season at the same event slug. 143 of 149 races carry their own geometry and four borrow; the two that cannot (2020 Sakhir and Tuscan, one-offs with no sibling event at the same slug) have no geometry anywhere and carry no rows.