Skip to content

Slot: Target Geography Type (target_geography_type)

Geographic unit the exposure value is attached to.

Tier: core

Why this slot matters

An exposure pinned to an exact residence and one averaged over a whole county are fundamentally different quantities with different privacy and misclassification profiles. Without the target geography, users cannot tell how localised the value is or link it correctly to health records held at a given geographic level.

In plain terms

This says what kind of place the value belongs to: one specific home address, a neighbourhood-sized census area, a ZIP-code area, a whole county, and so on. The bigger the unit, the more the number is a shared average rather than a personal measurement.

URI: envar:slot/target_geography_type

Applicable Classes

Name Description Modifies Slot
SpatialReference Spatial provenance of an environmental exposure value: the native grid / foot... yes

Properties

Type and Range

Property Value
Range TargetGeographyTypeEnum
Domain Of SpatialReference

Cardinality and Requirements

Property Value

Examples

Value
point_residence
census_tract

See Also

Identifier and Mapping Information

Annotations

property value
tier core
justification An exposure pinned to an exact residence and one averaged over a whole county are fundamentally different quantities with different privacy and misclassification profiles. Without the target geography, users cannot tell how localised the value is or link it correctly to health records held at a given geographic level.
explanation This says what kind of place the value belongs to: one specific home address, a neighbourhood-sized census area, a ZIP-code area, a whole county, and so on. The bigger the unit, the more the number is a shared average rather than a personal measurement.
covered_by None

Schema Source

Mappings

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

LinkML Source

name: target_geography_type
annotations:
  tier:
    tag: tier
    value: core
  justification:
    tag: justification
    value: An exposure pinned to an exact residence and one averaged over a whole
      county are fundamentally different quantities with different privacy and misclassification
      profiles. Without the target geography, users cannot tell how localised the
      value is or link it correctly to health records held at a given geographic level.
  explanation:
    tag: explanation
    value: 'This says what kind of place the value belongs to: one specific home address,
      a neighbourhood-sized census area, a ZIP-code area, a whole county, and so on.
      The bigger the unit, the more the number is a shared average rather than a personal
      measurement.'
  covered_by:
    tag: covered_by
    annotations:
      omop_gaia:
        tag: omop_gaia
        annotations:
          extent:
            tag: extent
            value: partial
          status:
            tag: status
            value: asserted
          where:
            tag: where
            value: gaia_db data_source.geom_type (point); location.geom
          note:
            tag: note
            value: GAIA records the geometry type (point) but not the full EnVar target-geography
              vocabulary (tract/ZCTA/county); values land on the person's point location.
      degauss:
        tag: degauss
        annotations:
          extent:
            tag: extent
            value: absent
          status:
            tag: status
            value: asserted
          where:
            tag: where
            value: no column
          note:
            tag: note
            value: DeGAUSS attaches values to the geocoded point residence but has
              no explicit target-geography-type field.
      amadeus:
        tag: amadeus
        annotations:
          extent:
            tag: extent
            value: absent
          status:
            tag: status
            value: asserted
          where:
            tag: where
            value: no column
          note:
            tag: note
            value: Amadeus collapses to lat/lon at the THREDDS request with no geography-type
              field.
      cher:
        tag: cher
        annotations:
          extent:
            tag: extent
            value: full
          status:
            tag: status
            value: asserted
          where:
            tag: where
            value: spatial-res code (c/t/b/z/h) + column_tag Spatial – Primary
          note:
            tag: note
            value: C-HER's spatial-resolution code names the geographic unit (county/tract/block
              group/ZCTA/H3) and column_tag flags the spatial-primary column (§2.3,
              §6.1).
      codata:
        tag: codata
        annotations:
          extent:
            tag: extent
            value: out_of_layer
          status:
            tag: status
            value: asserted
          where:
            tag: where
            value: no column
          note:
            tag: note
            value: The target geographic unit of a specific value is instance-layer
              detail outside the conceptual EV/DDI-CDI layer.
description: Geographic unit the exposure value is attached to.
title: Target Geography Type
examples:
- value: point_residence
  description: patient's exact residence coordinates (Daymet Tmax scenario)
- value: census_tract
  description: tract-level aggregate (ACAG PM2.5 scenario)
from_schema: https://w3id.org/linkml/microschemas/envar
see_also:
- https://www.census.gov/programs-surveys/geography/guidance/geo-areas.html
rank: 1000
domain_of:
- SpatialReference
range: TargetGeographyTypeEnum