The vertical angle of the club head's path at the moment of impact, measured relative to the ground. A positive angle of attack means the club is moving upward through impact (typical for driver swings); a negative angle means the club is moving downward (typical for iron swings).

For a driver, optimal angle of attack is typically +1° to +5° (slightly upward) to maximize distance and reduce spin. For irons, a negative angle of attack of -2° to -5° produces clean ball-then-turf contact.

Angle of attack is one of the more meaningful metrics for serious players because it's a primary lever for distance optimization. Not every launch monitor measures it directly. Among launch monitors in our catalog, the Rapsodo MLM2PRO, Square Golf Omni, Bushnell Launch Pro, Foresight GC3, and Uneekor EYE family directly measure angle of attack. The SkyTrak family does not.

→ Related: Photometric vs Doppler Radar Launch Monitors

The distance the ball travels through the air, from impact to the first ground contact, measured in yards. Distinct from total distance, which includes roll after the ball lands.

Carry distance is the more useful measurement for course management — it tells you how far the ball will fly to land on a green or clear a hazard, regardless of whether the surface is firm and rolling or soft and stopping.

Modern launch monitors calculate carry distance from launch parameters (ball speed, launch angle, spin rate) and air conditions. Indoor accuracy depends on the launch monitor's measurement precision; tour-level units like the Foresight GCQuad calculate carry within 1–2 yards of outdoor reality, while entry-level units may vary by 5–10 yards.

A launch monitor technology that tracks ball flight using radio waves bounced off the ball as it moves through the air. The radar unit sits behind the golfer (typically 6–8 feet behind the ball) and tracks the ball's velocity, direction, and trajectory through space.

Doppler radar excels outdoors with full ball flight to track. Indoors, where the ball travels only a few feet before hitting a screen, radar units rely heavily on algorithms to estimate what the ball would have done — which introduces accuracy compromises compared to camera-based (photometric) systems.

Launch monitors using Doppler radar in our catalog: Garmin Approach R10, FlightScope Mevo Gen 2.

Hybrid systems that combine Doppler radar with photometric cameras: SkyTrak Plus, SkyTrak ST MAX, Rapsodo MLM2PRO.

→ Related: Photometric vs Doppler Radar Launch Monitors

The structural setup that surrounds the player during a swing — typically a frame holding an impact screen at the front and side baffles or netting on the sides to contain mishit balls.

A hitting bay can be portable (Net Return Pro Series, which folds away) or permanent (Carl's Place enclosures, which install in a fixed location). Permanent enclosures generally offer better image quality (no light bleed around the screen) and a more polished aesthetic, while portable bays offer convenience and renter-friendliness.

Sizing matters: enclosure width determines whether right and left-handed players can both swing without repositioning equipment, and enclosure height affects clearance for full driver swings. Standard enclosures are 8–12 feet wide; wider versions (SIG12) accommodate ambidextrous setups.

The vertical angle of the ball's flight path at the moment it leaves the club face, measured relative to the ground. A higher launch angle means the ball climbs more steeply; a lower launch angle produces a flatter trajectory.

Optimal launch angle varies by club: drivers typically launch at 10–15° for maximum carry, while wedges launch at 25–35° for high-spinning approach shots.

Launch angle, combined with ball speed and spin rate, determines carry distance and trajectory. Most modern launch monitors directly measure launch angle to within 0.1–0.5 degrees of accuracy.

A launch monitor technology that uses high-speed cameras (typically 2 to 4 of them) to capture images of the ball and club at the moment of impact. The cameras photograph the ball's position, spin, and velocity directly rather than inferring from radar data.

Photometric systems typically sit beside the ball (or above it, in ceiling-mounted configurations) and only need to see impact — they don't require ball flight space. This makes them well-suited to indoor and small-room setups where Doppler radar units don't have enough depth.

Photometric launch monitors in our catalog: Square Golf Omni, Garmin Approach R50, Bushnell Launch Pro, Foresight GC3, Foresight GCQuad, Uneekor EYE MINI Lite, Uneekor EYE XO2.

→ Related: Photometric vs Doppler Radar Launch Monitors

A projector designed to produce a large image from a short distance to the screen — typically 4 to 7 feet for a 100-inch image, compared to 9 to 12 feet for standard projectors.

Short-throw is essentially mandatory for golf simulator use because the projector is mounted close to the screen (often above the player's head or just behind them) to avoid casting shadows when the player swings. The throw ratio describes this relationship: a 0.9 throw ratio means the projector needs to be 9 feet from the screen for a 10-foot wide image.

Common short-throw projectors for golf simulators: BenQ TK700STi (0.9–1.08 throw ratio, 4K, $1,499), BenQ LK936ST (laser, 4K, $3,499), Optoma GT1080HDR (1080p budget, $700).

The ratio of ball speed to club head speed at impact, calculated by dividing ball speed by club speed. A smash factor of 1.50 means the ball is leaving the club face at 1.5 times the speed the club was traveling.

Smash factor is a measure of contact efficiency: perfect center-face contact with no off-axis hit produces the maximum smash factor for a given club. The theoretical maximum for a driver is approximately 1.50 (limited by the rules of golf for legal driver faces); typical amateur smash factor with a driver is 1.42–1.48.

A consistently low smash factor (below 1.40 for driver) indicates off-center contact and is one of the clearest signals that ball-striking is hurting distance.

The tilt of the ball's spin axis as it flies through the air, measured in degrees from horizontal. A perfectly horizontal spin axis (0°) produces a straight ball flight with pure backspin; a tilted axis produces a curving ball flight.

A negative spin axis tilts the ball flight to the left (a draw or hook for right-handed players); a positive axis tilts it to the right (a fade or slice). Larger axis tilts produce more dramatic curve.

Spin axis is one of the harder metrics to measure accurately. Photometric launch monitors with multiple cameras (Foresight GC3, GCQuad, Uneekor EYE XO2) measure spin axis directly with high accuracy. Hybrid and radar units calculate it from other metrics, with varying accuracy.

A statistical measurement framework developed by Mark Broadie that compares a player's performance on each shot to a baseline expectation, then sums the differences across the round to identify where strokes are being gained or lost.

The framework breaks shots into categories: Strokes Gained Off-the-Tee, Strokes Gained Approach, Strokes Gained Around-the-Green, and Strokes Gained Putting. By comparing your performance in each category to a baseline (PGA Tour average, scratch golfer, or your own historical baseline), you can identify exactly where you're losing strokes.

For amateur golfers using a home simulator, strokes-gained analysis is the most useful framework for targeted practice — instead of vaguely "working on your swing," you can identify that you lose 2.3 strokes per round on approach shots from 150–175 yards and practice that specific scenario.

GSPro and Foresight FSX both include strokes-gained analysis features. Standalone tools like Shot Scope and DECADE also calculate strokes gained from on-course data.

→ Related: Strokes Gained Explained for Amateur Golfers