Multi platforms

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Clarify that keys to `item.assets` should be a finite (and preferably consistent) static set of values within a Collection.
 
+### Changed
+
+- Update Instrument common metadata Platform type to array of strings ([#1348](https://github.com/radiantearth/stac-spec/issues/1348))
+
 ## [v1.1.0] - 2024-09-10
 
 ### Added

commons/common-metadata.md

@@ -161,17 +161,17 @@ with domain-specific extensions that describe the actual data, such as the `eo`
 
 - [JSON Schema](../item-spec/json-schema/instrument.json)
 
-| Field Name    | Type      | Description                                                                  |
-| ------------- | --------- | ---------------------------------------------------------------------------- |
-| platform      | string    | Unique name of the specific platform to which the instrument is attached.    |
-| instruments   | \[string] | Name of instrument or sensor used (e.g., MODIS, ASTER, OLI, Canon F-1).      |
-| constellation | string    | Name of the constellation to which the platform belongs.                     |
-| mission       | string    | Name of the mission for which data is collected.                             |
-| gsd           | number    | Ground Sample Distance at the sensor, in meters (m), must be greater than 0. |
+| Field Name    | Type      | Description                                                                            |
+| ------------- | --------- | -------------------------------------------------------------------------------------- |
+| platform      | \[string] | Unique name(s) of the specific platform(s) to which the instrument(s) is/are attached. |
+| instruments   | \[string] | Name of instrument or sensor used (e.g., MODIS, ASTER, OLI, Canon F-1).                |
+| constellation | string    | Name of the constellation to which the platform belongs.                               |
+| mission       | string.   | Name of the mission for which data is collected.                                       |
+| gsd           | number    | Ground Sample Distance at the sensor, in meters (m), must be greater than 0.           |
 
 ### platform
 
-The unique name of the specific platform the instrument is attached to. For satellites this would
+The unique name(s) of the specific platform(s) the instrument(s) is/are attached to. For satellites this would
 be the name of the satellite, whereas for drones this would be a unique name for the drone. Examples include
 `landsat-8` (Landsat-8), `sentinel-2a` and `sentinel-2b` (Sentinel-2), `terra` and `aqua` (part of NASA EOS,
 carrying the MODIS instruments), `mycorp-uav-034` (hypothetical drone name), and `worldview02`

examples/collectionless-item.json

@@ -58,7 +58,9 @@
         "url": "http://remotedata.it"
       }
     ],
-    "platform": "cool_sat2",
+    "platform": [
+      "cool_sat2"
+    ],
     "instruments": [
       "cool_sensor_v1"
     ],
@@ -140,4 +142,4 @@
       "title": "Satellite Ephemeris Metadata"
     }
   }
-}
+}

examples/core-item.json

@@ -44,7 +44,9 @@
     "end_datetime": "2020-12-11T22:38:32.327Z",
     "created": "2020-12-12T01:48:13.725Z",
     "updated": "2020-12-12T01:48:13.725Z",
-    "platform": "cool_sat1",
+    "platform": [
+      "cool_sat1"
+    ],
     "instruments": [
       "cool_sensor_v1"
     ],
@@ -122,4 +124,4 @@
       "title": "Satellite Ephemeris Metadata"
     }
   }
-}
+}

examples/extended-item.json

@@ -53,7 +53,9 @@
     "datetime": "2020-12-14T18:02:31.437000Z",
     "created": "2020-12-15T01:48:13.725Z",
     "updated": "2020-12-15T01:48:13.725Z",
-    "platform": "cool_sat2",
+    "platform": [
+      "cool_sat2"
+    ],
     "instruments": [
       "cool_sensor_v2"
     ],

item-spec/json-schema/instrument.json

@@ -6,7 +6,10 @@
   "properties": {
     "platform": {
       "title": "Platform",
-      "type": "string"
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
     },
     "instruments": {
       "title": "Instruments",