SpatioTemporal Asset Catalog (STAC)
The Image Collections and Data Cube Collections produced in the Brazil Data Cube (BDC) project can be discovered and accessed through a standardized API known as SpatioTemporal Asset Catalog (STAC).
The diagram depicted in the Figure 6 contains the most important concepts behind the STAC data model:
The description of the concepts below are adapted from the STAC Specification:
STAC Itemis the atomic unit of metadata in STAC, providing links to the actual
assets(including thumbnails) that they represent. It is a
GeoJSON Featurewith additional fields for things like time, links to related entities and mainly to the assets. According to the specification, this is the atomic unit that describes the data to be discovered in a
spatiotemporal assetis any file that represents information about the earth captured in a certain space and time.
Catalog: provides a structure to link various
STAC Itemstogether or even to other
Collection: is a specialization of the
Catalogthat allows additional information about a spatiotemporal collection of data.