Division Boundary

Division boundary 是 division 之間的邊界。

Geometry Type	LineString
Theme	divisions
Type	division_boundary

Division boundary 是通常由官方定義的兩個 division 之間的邊界。考慮到地緣政治問題，一些邊界代表獨立的爭議線或條約線，因此不一定與 division 的邊界重合。

子類型

雖然 divisions 主題的 schema 包含了全面的子類型列表，但目前數據中僅提供了部分子類型。

目前，division_boundary 特徵類型中可用的子類型如下：

• country
• region
• county

country

subtype	country

country 是最大的獨立主權單位。國家的邊界由 division boundary 特徵表示。例如：美國

region

subtype	region

region 是大多數國家中的最大行政單位，並且是第一級行政區劃。例如：阿爾伯塔省

county

subtype	county

county 是一種第二級行政區。例如：紐約的金斯縣

架構

Browsable

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YAML

---
"$schema": https://json-schema.org/draft/2020-12/schema
title: boundary
description:
  Boundaries represent borders between divisions of the same subtype.
  Some boundaries may be disputed by the divisions on one or both sides.
type: object
properties:     # JSON Schema: Top-level object properties.
  id: { "$ref": ../defs.yaml#/$defs/propertyDefinitions/id }
  geometry:
    description:
      Boundary's geometry which MUST be a LineString or MultiLineString
      as defined by the GeoJSON schema.
    unevaluatedProperties: false
    oneOf:
      - "$ref": https://geojson.org/schema/LineString.json
      - "$ref": https://geojson.org/schema/MultiLineString.json
  properties:   # GeoJSON: top-level object 'properties' property.
    unevaluatedProperties: false
    required: [subtype, class, division_ids]
    allOf:
      - "$ref": ../defs.yaml#/$defs/propertyContainers/overtureFeaturePropertiesContainer
    properties: # JSON Schema: properties within GeoJSON top-level object 'properties' property
      subtype: { "$ref": "./defs.yaml#/$defs/propertyDefinitions/placetype" }
      class:
        type: string
        enum:
          - land        # None of the boundary geometry extends beyond the
                        # coastline of either associated division.

          - maritime    # All the boundary geometry extends beyond the
                        # coastline of both associated divisions.
      division_ids:
        description:
          Identifies the two divisions to the left and right, respectively, of
          the boundary line. The left- and right-hand sides of the boundary are
          considered from the perspective of a person standing on the line
          facing in the direction in which the geometry is oriented, i.e. facing
          toward the end of the line.
          
          The first array element is the Overture ID of the left division. The
          second element is the Overture ID of the right division.
        type: array
        items: { "$ref": "../defs.yaml#/$defs/propertyDefinitions/id" }
        minItems: 2
        maxItems: 2
        uniqueItems: true
      is_disputed:
        description: >-
          Indicator if there are entities disputing this division boundary.
          Information about entities disputing this boundary should be included in perspectives
          property.

          This property should also be true if boundary between two entities is unclear
          and this is "best guess". So having it true and no perspectives gives map creators
          reason not to fully trust the boundary, but use it if they have no other.
        type: boolean
      perspectives:
        description: >-
          Political perspectives from which this division boundary is considered
          to be an accurate representation.
      
          If this property is absent, then this boundary is not known to
          be disputed from any political perspective. Consequently,
          there is only one boundary feature representing the entire
          real world entity.
      
          If this property is present, it means the boundary represents
          one of several alternative perspectives on the same real-world
          entity.
      
          There are two modes of perspective:
          
            1. `accepted_by` means the representation of the boundary is
               accepted by the listed entities and would be included on
               a map drawn from their perspective.
      
            2. `disputed_by` means the representation of the boundary is
               disputed by the listed entities and would be excluded
               from a map drawn from their perspective.
              
          When drawing a map from the perspective of a given country,
          one would start by gathering all the undisputed boundary
          (with no `perspectives` property), and then adding to that
          first all boundary explicitly accepted by the country, and
          second all boundary not explicitly disputed by the country.
        allOf: 
          - "$ref": "./defs.yaml#/$defs/propertyDefinitions/perspectives"

範例

boundary

{
  "id": "example:division_boundary:land",
  "type": "Feature",
  "geometry": {
    "type": "LineString",
    "coordinates": [
      [
        0,
        1
      ],
      [
        1,
        2
      ]
    ]
  },
  "properties": {
    "theme": "divisions",
    "type": "division_boundary",
    "version": 1,
    "subtype": "region",
    "class": "land",
    "division_ids": [
      "example:division:region:left",
      "example:division:region:right"
    ]
  }
}

disputed boundary

{
  "id": "example:division_boundary:disputed_both",
  "type": "Feature",
  "geometry": {
    "type": "LineString",
    "coordinates": [
      [
        0,
        1
      ],
      [
        1,
        2
      ]
    ]
  },
  "properties": {
    "theme": "divisions",
    "type": "division_boundary",
    "version": 1,
    "subtype": "country",
    "class": "land",
    "division_ids": [
      "example:division:country:left",
      "example:division:country:right"
    ],
    "is_disputed": true,
    "perspectives": {
      "mode": "disputed_by",
      "countries": [
        "XX",
        "XY"
      ]
    }
  }
}