Slot: Native Value Offset (native_value_offset)

CF-style packing offset applied when decoding the source's stored integers to physical values (physical = stored × scale_factor + add_offset). Only meaningful alongside native_units_ucum.

Tier: optional

Why this slot matters

The offset half of the unpacking convention; without it the scale factor alone still decodes to the wrong physical value.

In plain terms

The second constant in the space-saving trick: after multiplying the stored number, add this to get the real measurement.

URI: envar:slot/native_value_offset

Applicable Classes

Name	Description	Modifies Slot
VariableIdentity	The identity and semantics of an environmental exposure variable — what physi...	no

Properties

Type and Range

Property	Value
Range	Float
Domain Of	VariableIdentity

Cardinality and Requirements

Property	Value

Examples

Value
220.0

Comments

• Added after the reverse gap survey (docs/reverse-gap-survey.md, 2026-07) together with native_value_scale_factor — the other half of the packed-value decode convention the Amadeus THREDDS metadata declares and the sidecar previously lost.

See Also

• https://cfconventions.org/cf-conventions/cf-conventions.html#packed-data

Identifier and Mapping Information

Annotations

property	value
tier	optional
justification	The offset half of the unpacking convention; without it the scale factor alone still decodes to the wrong physical value.
explanation	The second constant in the space-saving trick: after multiplying the stored number, add this to get the real measurement.

Schema Source

• from schema: https://w3id.org/linkml/microschemas/envar

Mappings

Mapping Type	Mapped Value
self	envar:native_value_offset
native	envar:native_value_offset

LinkML Source

name: native_value_offset
annotations:
  tier:
    tag: tier
    value: optional
  justification:
    tag: justification
    value: The offset half of the unpacking convention; without it the scale factor
      alone still decodes to the wrong physical value.
  explanation:
    tag: explanation
    value: 'The second constant in the space-saving trick: after multiplying the stored
      number, add this to get the real measurement.'
description: CF-style packing offset applied when decoding the source's stored integers
  to physical values (`physical = stored × scale_factor + add_offset`). Only meaningful
  alongside `native_units_ucum`.
title: Native Value Offset
comments:
- Added after the reverse gap survey (docs/reverse-gap-survey.md, 2026-07) together
  with `native_value_scale_factor` — the other half of the packed-value decode convention
  the Amadeus THREDDS metadata declares and the sidecar previously lost.
examples:
- value: '220.0'
  description: gridMET tmmx packing offset (unpacks to true Kelvin)
from_schema: https://w3id.org/linkml/microschemas/envar
see_also:
- https://cfconventions.org/cf-conventions/cf-conventions.html#packed-data
rank: 1000
domain_of:
- VariableIdentity
range: float