Downloading catalogs

Stub

Final content will walk through acid download for every supported source (HTTP, SSH, local) and every common subsetting pattern (cone, columns, both).

Topics planned:

  • acid download URL DEST for HTTP, SSH (user@host:/path), and local-filesystem mirrors.
  • --cone RA,DEC,RADIUS_DEG for spatial subsets.
  • --columns ra,dec,mag for column subsets. HATS RA/Dec/healpix columns are auto-included.
  • --estimate to preview download size before pulling.
  • --workers N for parallel transfers.
  • acid inspect <URL> for peeking at a remote catalog (summary, schema, properties) before downloading.
  • What gets generated locally: point_map.fits, refreshed _metadata, optional margin cache.

The downloaded directory is itself a valid HATS catalog you can hand straight to acid.sql(catalogs="./that/dir/").