{
  "schema": "signed-route-geometry/v1",
  "planar": {
    "horizontal": "a+c+e",
    "vertical": "b-d+f",
    "major_direction": "assumed horizontal; actual comparison required",
    "transverse": "sqrt(b^2+d^2+f^2)"
  },
  "three_plane": {
    "X": "a+e",
    "Y": "c+g",
    "Z": "b-d+f",
    "governing": "largest actual signed separation magnitude",
    "example_assumption": "X largest",
    "transverse_for_X": "b+c+d+f+g per selected adaptation"
  },
  "screening": {
    "developed_length": "sum unsigned segment lengths",
    "anchor_separation": "sqrt(X^2+Y^2+Z^2)",
    "different_method_symbols": "not automatically offsetL/h"
  },
  "basis": "existing preliminary standard-weight/material/diameter/temperature/unit scope and unresolved coefficient limits retained"
}