A Python pipeline for photometric redshift estimation, designed to work with large astronomical catalogs. This repository provides tools to download a DESI DR9 galaxy catalog and split it into HEALPix-based tiles for efficient spatial indexing.
The project currently implements two preprocessing steps:
- Download the DESI DR9 catalog from an external URL.
- Split the catalog into smaller FITS files per HEALPix pixel (coarse resolution) and adds a column with a finer HEALPix index.
- Python 3.6 or higher
- Required packages:
numpyastropyhealpypyyamlrequeststqdm
Install them with:
pip install numpy astropy healpy pyyaml requests tqdm