Maxar STAC Item

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/maxar-technologies/main/json-schema/maxar-technologies-stac-item-schema.json",
  "title": "Maxar STAC Item",
  "description": "STAC Feature item returned by Vantor Hub Discovery and the Maxar Open Data STAC catalog.",
  "type": "object",
  "required": ["type", "id", "geometry", "properties"],
  "properties": {
    "type":        { "type": "string", "const": "Feature" },
    "stac_version": { "type": "string" },
    "id":          { "type": "string" },
    "collection":  { "type": "string" },
    "bbox": {
      "type": "array",
      "items": { "type": "number" },
      "minItems": 4,
      "maxItems": 6
    },
    "geometry":   { "type": "object", "description": "GeoJSON geometry" },
    "properties": {
      "type": "object",
      "properties": {
        "datetime":      { "type": "string", "format": "date-time" },
        "platform":      { "type": "string", "examples": ["WorldView-3", "WorldView-Legion", "GeoEye-1"] },
        "instruments":   { "type": "array",  "items": { "type": "string" } },
        "gsd":           { "type": "number", "description": "Ground sample distance (m)" },
        "cloud_cover":   { "type": "number", "minimum": 0, "maximum": 100 },
        "off_nadir":     { "type": "number" },
        "sun_elevation": { "type": "number" }
      }
    },
    "assets": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "required": ["href"],
        "properties": {
          "href":  { "type": "string", "format": "uri" },
          "type":  { "type": "string" },
          "roles": { "type": "array", "items": { "type": "string" } },
          "title": { "type": "string" }
        }
      }
    },
    "links": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["href", "rel"],
        "properties": {
          "href":  { "type": "string", "format": "uri" },
          "rel":   { "type": "string" },
          "type":  { "type": "string" },
          "title": { "type": "string" }
        }
      }
    }
  }
}