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kshitijd
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mmu-xmatch-5k

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matched
bool
2 classes
_healpix_29
int64
3.12B
3,458,764,505B
false
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MMU Crossmatch: 5,000 objects x up to 7 modalities

Object-level positional crossmatch built strictly from the MultimodalUniverse v1.5 HATS catalogs with LSDB. Anchor: the DESI DR1 redshift catalog (LSDB/desi-dr1-zcat), filtered to primary rows with clean redshifts (ZCAT_PRIMARY & ZWARN==0); every object therefore starts with a measured redshift, and DESI spectra payloads are attached where the EDR release provides them.

  • spine_selected.parquet — the 5,000 objects: ra/dec/z, per-modality flags, n_mod. spine_full.parquet — flags for all 20,415,199 anchors.
  • modalities/*.parquet — full payloads (spectra, images, light curves, labels) per source catalog, keyed by spine_id.
  • stats.json — counts and provenance. checkpoints/ — build state.

Method: LSDB k-d tree nearest-neighbour matching (1-3", n_neighbors=1). Caveats: upstream catalogs ship no margin caches (tile-edge matches may be missed); matches are positional only. Credits: MultimodalUniverse (arXiv:2412.02527, CC-BY-4.0; per-subset licenses apply), UniverseTBD + LINCC Frameworks (HATS conversion), LSDB (arXiv:2501.02103).
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Number of rows:
20,181,991
Total file size:
10.6 GB

Papers for kshitijd/mmu-xmatch-5k