msiudek/astroPT_euclid_Q1_desi_dr1_dataset

DESI DR1 × Euclid Q1 Dataset

Dataset Description

This dataset contains the cross-matched catalog between DESI Data Release 1 (DR1) and Quick Data Release 1 (Q1) data.

Dataset Summary

• Total Sources: 39,850 galaxies
• Cross-match Radius: 0.5 arcsec
• Data Products:
  • Euclid VIS imaging
  • Euclid NISP imaging (Y, J, H bands)
  • DESI spectra

Source Data

1. DESI Sample Selection: Applied quality cuts to DESI DR1:

   • ZCAT_PRIMARY == True
   • ZWARN == 0 or ZWARN == 4
   • COADD_FIBERSTATUS == 0
   • SPECTYPE != 'STAR'
   • Z > 0

2. Euclid Sample Selection: Applied quality cuts to Euclid MER Q1:

   • VIS_DET == 1
   • gaia_id IS NULL
   • spurious_prob < 0.2
   • flux_detection_total > 0.0

Data Splits

• Train: 80% (31,880 galaxies)
• Test: 20% (7,970 galaxies)

Split created using stratified random sampling with random_state=42.

Usage

from datasets import load_dataset

# Load the full dataset
dataset = load_dataset("msiudek/astroPT_euclid_Q1_desi_dr1_dataset")

# Access train/test splits
train_data = dataset['train']
test_data = dataset['test']

# Example: Access a single sample
sample = train_data[0]
vis_image = sample['vis_image']
spectrum = sample['spectrum']
redshift = sample['redshift']

Metadata catalog

A companion metadata catalog (FITS table) with per-object properties and cross-match details is published as a separate dataset on Hugging Face:

• Metadata dataset: https://huggingface.co/datasets/msiudek/astroPT_euclid_Q1_desi_dr1_metadata

How to access the metadata FITS directly from the hub using Astropy:

from huggingface_hub import hf_hub_download
from astropy.table import Table
import warnings
from astropy.units.core import UnitsWarning

# Optional: silence non-standard FITS unit warnings (e.g., 'nanomaggy', 'NA')
warnings.filterwarnings("ignore", category=UnitsWarning)

fits_path = hf_hub_download(
  repo_id="msiudek/astroPT_euclid_Q1_desi_dr1_metadata",
  repo_type="dataset",
  filename="DESI_DR1_Euclid_Q1_dataset_catalog_EM.fits",
)
tab = Table.read(fits_path, format="fits")
print(tab)

Citation

If you use this dataset, please cite:

@dataset{euclid_desi_dr1_q1,
  author = {Siudek, M. and collaborators},
  title = {DESI DR1 × Euclid Q1 Cross-matched Dataset},
  year = {2025},
  url = {https://huggingface.co/datasets/msiudek/astroPT_euclid_Q1_desi_dr1_dataset}
}