3. How to create extra_metadata.json file

The dictionary has two primary keys, namely collection and item, which might have additional subkeys based on the definitions of pystac.Collection and pystac.Item.

Each collection in the STAC-Collection JSON file can have keywords and providers as list, and licence as a string at the top level. To incorporate additional fields into the STAC-Collection JSON file, we can append them to the extra_fields dictionary. The addition of extra_fields is possible within the Metadata section of the STAC-Collection JSON file.

To include pystac.common_metadata attributes in the STAC-Item JSON file, we can add them to the top level of each item. To incorporate additional fields into the STAC-Item JSON file, we can append them to the properties dictionary. The Metadata part of the STAC-Item JSON file allows for the inclusion of properties. It is important to mention that the extra_fields parameter can also be utilised to include more fields in the STAC-Item JSON file.

{
    "collection": {
        "extra_fields":{
            "anything": "anything",
            "version": ""
        },
        "keywords": ["something"],
        "license": "something",
        "providers": []

    },
    "item": {
        "extra_fields":{
            "anything": "anything",
            "something_else": "something"
        },
        "properties":{
            "anything": "anything",
            "something_else": "something"
        },
        "created": "It will fill out automatically if set extra_metadata to True",
        "description": "",
        "end_datetime": "It will fill out automatically if set extra_metadata to True",
        "geometry": {},
        "gsd": "",
        "instruments": [],
        "license": "",
        "platform": "",
        "providers": [],
        "start_datetime": "It will fill out automatically if set extra_metadata to True",
        "title": "",
        "updated": "It will fill out automatically if set extra_metadata to True",
    }
}