The document discusses using the SpatioTemporal Asset Catalog (STAC) to catalog geospatial datasets. STAC defines JSON schemas to encode metadata about spatiotemporal data like remote sensing imagery. This allows datasets like the European Space Agency's Sentinel-2 satellite data, containing petabytes of images, to be more easily searched. The STAC API also defines standards for searching and discovering STAC metadata. Tools like PySTAC and pystac-client make it easier to work with STAC catalogs and APIs in Python. Open questions remain around best representing multi-dimensional datasets like Zarr in STAC.