Pitch Lab — physics-grade metrics

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NO VENUE BASELINE
Ball 0 / 0
Innings
Top-of-stumps length — pace
What length a seamer has to hit to clip the top of the stumps, and how far off it they are
Top-of-stumps length — spin
The same question for the spinners, solved on their deliveries alone
Taking pace off — where to land it
Seam bowlers either side of 130 kph, each solved for the length that hits the stumps
Length effectiveness
What length hits the top of the stumps today — a pitch property, independent of any bowler or batter
Bounce & bounce consistency
COR as the pitch indicator; spread about the length+speed curve as the variability measure
Pace & bounce — the pitch quadrant
Eff-friction vs restitution per session/end, with a trail across the day — the honest replacement for a single "pbr" index
Grip — seam & spin
How hard the surface pushes the ball sideways, from the velocity change across the bounce
Swing — seam-up pace only
Lateral displacement in ball widths, not degrees — degrees flatter slow bowlers
Spin — movement through the air
Drift (side-spin) and dip (over-spin), drag-corrected, plus Revs (C_L) — the total revolutions imparted regardless of axis
Ball age — how the ball changes across an innings
Pace swing, seam deviation and speed vs overs bowled, pooled across every Test — the red-ball reference curve, independent of the match being replayed

Swing = Hawk-Eye's own pre-bounce swing distance (the lateral distance the ball deviates in the air, from its fitted trajectory) — independent of pace, unlike the feed's degrees; a kinematic proxy fills in if the feed omits it. Seam-up = net lift (accZ + 9.81 > 0). Grip = |ΔVy| / |ΔVx| across the bounce. Bounce consistency = spread of residuals about the length→height curve. Cells below the sample threshold are suppressed rather than shown as a misleading average. Venue baselines require historical matches at this ground and are not loaded.