Bodies

Body navigation models render the predicted appearance of a planetary body and emit one NavFeature per surviving feature type. Concrete subclasses derive from NavModelBodyBase, which carries shared annotation helpers (limb-mask extraction and label placement).

Registered concrete subclasses:

• NavModelBody — catalog-driven body navigation; one instance per body whose inventory_body_in_extfov() predicate fires. Documented at Body Navigation Model.

• NavModelBodySimulated — simulated-image GUI variant; emits a single BODY_DISC feature carrying the rendered template.

Per-body shape, albedo, and SPK-residual quantities consumed by the covariance and emission gates live in nav.nav_model.body_shape. The runtime lookup shape_for_body() overlays operator YAML (config_220_body_shape.yaml) onto the hard-coded BODY_SHAPE_TABLE, falling back to DEFAULT_BODY_SHAPE for entirely unknown bodies.

• Body Navigation Model
  • Overview
  • Theory
    • Bounding-box construction
    • Anti-aliased silhouette extraction
    • Polyline sampling
    • Per-vertex position covariance
    • Visible-lit and overflow fractions
    • Lit-weighted predicted centroid
    • Sub-solar direction
    • Phase-and-irregularity coupling
    • Feature emission gates
    • Restrictions and assumptions
    • Sources of uncertainty
  • Configuration
    • bodies block
    • Body-shape catalogue
    • Module-level emission constants
    • Per-instrument overrides
  • Implementation
    • BodyShape dataclass
    • Annotation helpers
    • Per-image metadata
    • Call path
  • Examples
• Simulated Body Navigation Model
  • Overview
  • Theory
    • Restrictions and assumptions
    • Sources of uncertainty
  • Configuration
    • Render geometry vs navigation geometry
  • Implementation
    • Call path
  • Examples