The STAC Item object is the most important object in a STAC system. An Item is the entity that contains metadata for a scene and links to the assets.
Item objects are the leaf nodes for a graph of Catalog and Collection objects. See the overview document for more information about how these objects relate to each other.
Specification: The STAC Item specification is in item-spec.md. It includes an overview and an in-depth explanation of the fields.
Schemas: The OpenAPI specification in item.json defines an Item object. The basics, datetime, instrument, licensing, and provider schemas validate additional fields defined in Common Metadata.
Common Metadata: A set of commonly-used fields for STAC Items is listed in common-metadata.md.
Note
In cases where a set of Items is grouped together (e.g. for providing search results), the ItemCollection object has been defined in the STAC API specification.
Similarly to the relationship between a GeoJSON Feature and a STAC Item, a STAC ItemCollection should be a valid GeoJSON FeatureCollection to allow interoperability with existing tools that support GeoJSON.