Dealey Plaza / trajectory sandbox

Geometry first, conclusions last.

This sandbox models a straight-line ray through a plaza-relative coordinate frame. The scene is not survey-grade and does not assert a shot origin; it gives researchers a controlled place to vary assumptions and inspect the resulting math.

Witness map Source records

Line distance144.6 ft

Horizontal132.9 ft

Elevation-23.2°

Azimuth45.0°

Linked 2D Plan View

Top-down X/Z projection using the same active ray, frame markers, and intersection math as the 3D scene.

Historical Image Overlay

Annotated Dealey Plaza, Warren Commission CE359. Provisional affine fit from visible plaza landmarks into current schematic coordinates. Use for orientation, not survey-grade measurement.

Image source

20 witness positions / fit residuals: ray 32.3 px, witnesses 73.7 px

Calibration diagnostics

Ray fit residual32.3 px

Witness fit residual73.7 px

TSBD sixth-floor window regionX -48.0 / Z 36.0 / px 111, 190
Elm Street turn below TSBDX -26.0 / Z -16.0 / px 183, 257
Approximate Z313 road pointX 58.0 / Z -70.0 / px 315, 468
Triple underpass road exitX 22.0 / Z -88.0 / px 326, 518
Grassy knoll label regionX 50.0 / Z 24.0 / px 232, 405

Ray Controls

Scenario preset

Foundation preset matching the initial sandbox ray. Coordinates are provisional scene anchors.

Zapruder frame scrubber

Z225 - Reaction window+0.82s / configured marker

Origin

Origin east/west-48.0 ftOrigin height62.0 ftOrigin north/south36.0 ft

Target

Target east/west46.0 ftTarget height5.0 ftTarget north/south-58.0 ft

Uncertainty

Angular tolerance3.1°

Deterministic Math

Delta X

94.0 ft

Delta Y

-57.0 ft

Delta Z

-94.0 ft

Flight @ 2000 fps

0.072 s

Cone radius

7.8 ft

Frame Intersections

Each row projects the active ray through a frame target's north/south plane and compares that crossing to the sourced frame marker.

Z210

Approach window

Inside cone

Crosses at X 38.0 / Y 9.9

Miss 4.9 ftCone 7.2 ft

Z225

Reaction window

Inside cone

Crosses at X 46.0 / Y 5.0

Miss 0.0 ftCone 7.8 ft

Z313

Head-shot frame

Outside ray

No crossing inside the current ray segment

Miss n/aCone n/a

Assumptions

Coordinate frame
Approximate plaza-relative feet: X east/west, Y elevation, Z north/south.
TSBD origin
Placeholder sixth-floor window position for geometry only.
Target body point
Adjustable point representing a generic impact/intersection location.
Physics scope
Straight-line ray and travel-time readout; no drag, tumbling, deflection, or wound-ballistics model.
Origin
Placeholder sixth-floor TSBD window anchor pending survey-grade measurement ingest.
Target
Generic body/intersection point for geometry testing, not a historical finding.

Source Trail

Scenario preset
TSBD window to generic target
Foundation preset matching the initial sandbox ray. Coordinates are provisional scene anchors.
Frame marker
Z225 - Reaction window
Approximate timing checkpoint after the limousine has moved farther down Elm Street.
Origin coordinate
X -48.0 / Y 62.0 / Z 36.0
Current origin slider values in the plaza-relative coordinate frame.
Target coordinate
X 46.0 / Y 5.0 / Z -58.0
Current target slider values used by the deterministic ray solver.
Uncertainty cone
3.1 degrees
Angular tolerance is visualized as a cone around the ray; it communicates model uncertainty, not probability.
film
Zapruder film evidence item
Visual timing reference for frame-labeled comparison points. This sandbox uses frame markers as navigation aids, not as forensic conclusions.
record
Warren Commission report
Primary report page used here as a stable entry point for Commission-era timing, exhibit, and scene references.
model
Plaza-relative coordinate frame
Approximate local feet with +X east/right, +Y elevation, and +Z north/forward. Coordinates are current model inputs, not survey-grade measurements.