Definition of "extent"

NOTE: Markdown does not support highlighting in color, so bold/italic has been used to highlight the material being discussed. This issue is extracted from the document submitted by Roger Lott at https://github.com/opengeospatial/CRS-JSON-Encoding/blob/main/ProjJson%20v0-7%20RL%202024-06-16.docx for discussion at the CRS SWG meeting OGC held during the Montreal June 2024 TC meeting.

"extent": {
    "type": "array",
    "items": {
      "type": "object",
      "properties": {

"extent_description": { "type": "string" },

        "bbox": { "$ref": "#/definitions/bbox" },
        "extent_polygon": { "type": "array" },
        "vertical_extent": { "$ref": "#/definitions/vertical_extent" },
        "temporal_extent": { "$ref": "#/definitions/temporal_extent" }
       },

"required" : [ "extent_description", "bbox" ],

      "additionalProperties": false
    }
},

"$comment": "[RL] In ISO 19111 [OGC Abstract Spec Topic 2](from ISO 19115 [OGC Abstract Spec Topic 11]) an extent must contain at least one of the above properties; it may contain any or all of these properties. In ISO 19127 (geodetic registry) this is specialised: a description and a bbox are made mandatory, the remaining properties are optional. If this is considered best practice for geodetic registries, should it be considered as appropriate for CRS JSON?"

Inizia con l’estratto dello schema extent in questa issue e con il ProjJson v0-7 RL 2024-06-16.docx collegato, quindi esamina i requisiti citati di ISO 19111 e ISO 19127. Determina se extent_description e bbox debbano essere obbligatori in CRS JSON e registra la modifica dello schema o la motivazione concordata.