Source: https://guthlabs.ai/docs/instruments/geologic-strain-dip-strike-helper/implementation/

instrument implementation / implementation-contract

# Geologic Strain/Dip-Strike Helper implementation

A source-bound implementation contract for Geologic Strain/Dip-Strike Helper; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-090

**Effect**: Computation or source lookup only

## Input and validation requirements

The exact input combination apparent dip 30° and section-strike angle 90° makes the inversion denominator cos(90°) equal to zero, so the true dip is undefined and the instrument must reject the input rather than return a finite number.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "apparent_dip_deg": 0,
    "angle_section_to_strike_deg": 45
  },
  "expected_outputs": {
    "true_dip_deg": 0
  },
  "working": "tan(0°) = 0; sin(45°) = 0.70710678; tan(true dip) = 0 / 0.70710678 = 0; true dip = atan(0) = 0°."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/geologic-strain-dip-strike-helper/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/geologic-strain-dip-strike-helper/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/geologic-strain-dip-strike-helper/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`