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Slot: Extraction Buffer Radius (m) (extraction_buffer_m)

Radius of any spatial buffer applied (e.g. greenspace at 500 / 1500 / 2500 m). Null when no buffer is applied.

Tier: conditionally_core

Why this slot matters

For buffer-based strategies the radius is a hyperparameter that changes the assigned exposure — greenspace within 500 m and within 2500 m of a home are different quantities. Omitting it makes buffer-derived values unreproducible and incomparable across analyses.

In plain terms

Some exposures are summarised over a circle drawn around the patient's home rather than at the exact address — for example, how much green space lies within walking distance. This field gives the radius of that circle in metres; a bigger circle averages over more surroundings.

URI: envar:slot/extraction_buffer_m

Applicable Classes

Name Description Modifies Slot
SpatialReference Spatial provenance of an environmental exposure value: the native grid / foot... no

Properties

Type and Range

Property Value
Range Float
Domain Of SpatialReference

Cardinality and Requirements

Property Value

Examples

Value
500

Identifier and Mapping Information

Annotations

property value
tier conditionally_core
tier_context cross-module — Core iff linkage_method.linkage_strategy is buffer_aggregation_around_residence. Not expressible as a class rule (rules cannot reach across classes), so the checker evaluates it in RESIDUAL_CONTEXT_PREDICATES.
justification For buffer-based strategies the radius is a hyperparameter that changes the assigned exposure — greenspace within 500 m and within 2500 m of a home are different quantities. Omitting it makes buffer-derived values unreproducible and incomparable across analyses.
explanation Some exposures are summarised over a circle drawn around the patient's home rather than at the exact address — for example, how much green space lies within walking distance. This field gives the radius of that circle in metres; a bigger circle averages over more surroundings.

Schema Source

Mappings

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

LinkML Source

name: extraction_buffer_m
annotations:
  tier:
    tag: tier
    value: conditionally_core
  tier_context:
    tag: tier_context
    value: cross-module — Core iff linkage_method.linkage_strategy is buffer_aggregation_around_residence.
      Not expressible as a class rule (rules cannot reach across classes), so the
      checker evaluates it in RESIDUAL_CONTEXT_PREDICATES.
  justification:
    tag: justification
    value: For buffer-based strategies the radius is a hyperparameter that changes
      the assigned exposure — greenspace within 500 m and within 2500 m of a home
      are different quantities. Omitting it makes buffer-derived values unreproducible
      and incomparable across analyses.
  explanation:
    tag: explanation
    value: Some exposures are summarised over a circle drawn around the patient's
      home rather than at the exact address — for example, how much green space lies
      within walking distance. This field gives the radius of that circle in metres;
      a bigger circle averages over more surroundings.
description: Radius of any spatial buffer applied (e.g. greenspace at 500 / 1500 /
  2500 m). Null when no buffer is applied.
title: Extraction Buffer Radius (m)
examples:
- value: '500'
  description: 500 m greenspace buffer; null in the Daymet Tmax scenario (no buffer)
from_schema: https://w3id.org/linkml/microschemas/envar
rank: 1000
domain_of:
- SpatialReference
range: float