Coverage Metric

Coverage Metric assets are child analysis assets under Coverage Analysis. They represent derived quantities computed from coverage results rather than independent physical objects.

Role in ASTROLAB

Workflow	Coverage metric role
Coverage reporting	Defines which coverage quantity should be summarized.
Plotting	Provides scalar values for maps, tables, or charts.
Analysis tree organization	Lives under a Coverage Analysis asset.

Conceptual Flow

flowchart TD
    C["Coverage Analysis"] --> R["Coverage results"]
    R --> M["Coverage Metric"]
    M --> S["Scalar value or derived series"]
    S --> P["Plots and reports"]

Typical Metric Concepts

Coverage metric definitions can represent quantities such as:

Metric concept	Meaning
Access duration	Total time a point is covered.
Access count	Number of access intervals.
Gap statistics	Time between coverage opportunities.
Percent coverage	Fraction of the analysis interval with access.

Notes

• A Coverage Metric depends on a parent Coverage Analysis.
• It should not recompute access geometry directly.
• It should consume existing coverage payloads and produce derived values for reports or plots.