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Data access plan

No survey products are distributed with this repository. As the analysis is implemented, acquisition steps should be documented for each dataset:

  • DESI galaxies – tracer selections, release versions, and any preprocessing scripts (masking, depth cuts, random catalogs).
  • Planck PR4 CMB lensing – download endpoints, filtering steps, and conversion to the internal map format.
  • ACT DR6+ CMB lensing – access requirements and calibration steps required for cross-correlation with DESI.

All data handling occurs on NERSC systems rather than in a local data/ directory. Populate the following shared paths:

/global/cfs/cdirs/desi/users/<username>/desi-cmb-fli/inputs/    # Read-only DESI catalogs, masks
/pscratch/sd/<u>/<username>/desi-cmb-fli/interim/               # Cached development products
/pscratch/sd/<u>/<username>/desi-cmb-fli/processed/             # Analysis-ready summaries and chains

The <u> placeholder is the first character of your NERSC username, matching NERSC's scratch path convention.

Document the provenance of each file (checksums, licences, access controls) alongside the instructions you record here so that collaborators can reproduce your environment on Perlmutter.