# `Diffo.Provider.BaseGeographicLocation`
[🔗](https://github.com/diffo-dev/diffo/blob/v0.9.0/lib/diffo/provider/components/base_geographic_location.ex#L5)

Ash Resource Fragment for TMF675 GeographicLocation — geometry-bearing Place
(a point or polygon region in WGS-84).

Compose with `BasePlace` on a concrete leaf to require the BasePlace geometry
attributes (`location` or `bounds`) be set, add the `accuracy` attribute, and
carry the TMF675 GeoJson wire shape through `BasePlace`'s existing
`encode_geo_json/2` customize.

`Diffo.Provider.GeographicLocation` uses this fragment directly as the
out-of-the-box TMF GeographicLocation resource. Domain extenders compose the
same two fragments on their own leaf.

## Attributes

- `accuracy` — float, meters of positional accuracy (TMF675 `accuracy` field).
  Free-form numeric; not constrained.

## Geometry (inherited from `BasePlace`)

- `location` — `AshGeo.GeoJson` (`:point`, WGS-84). `%Geo.Point{coordinates: {lon, lat}, srid: 4326}`.
- `bounds` — `AshGeo.GeoJson` (`:polygon`, WGS-84). `%Geo.Polygon{coordinates: [ring], srid: 4326}`.

## Tightened validation

`BasePlace` already enforces:

- At most one of `[location, bounds]` may be set.
- Geometry is only allowed when `type == :GeographicLocation`.

This fragment adds the inverse direction:

- `type == :GeographicLocation` **requires** at least one of `[location, bounds]` set.

## Wire shape (TMF675)

Inherits BasePlace's `encode_geo_json/2` customize which rebrands `@type` to
`GeoJsonPoint` or `GeoJsonPolygon` and emits the geometry as a TMF675 `geoJson`
field with `@baseType: "GeographicLocation"`.

# `extensions`

# `opts`

# `persisted`

# `spark_dsl_config`

# `validate_sections`

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*Consult [api-reference.md](api-reference.md) for complete listing*