Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
start [2024/10/15 15:14]
Déborah Paradis 		start [2026/03/09 12:53] (current)
Déborah Paradis
Line 1: Line 1:
 ====== Home ====== ====== Home ======
  
-Welcome to the "​**Centre d'​Analyse de Données Etendues**"​ (CADE) or "//​Analysis Center for Extended Data//"​. CADE provides maps of ancillary astronomical data to users in the astronomical community. The emphasis of CADE is on extended sky emission. The database is provided in the [[http://healpix.jpl.nasa.gov|HEALPix]] sky pixelization scheme.+Welcome to the "​**Centre d'​Analyse de Données Etendues**"​ (CADE) or "//​Analysis Center for Extended Data//"​. CADE provides maps of ancillary astronomical data to users in the astronomical community. The emphasis of CADE is on extended sky emission. The database is provided in the [[https://irsa.ipac.caltech.edu/​healpix/​index.html|HEALPix]] sky pixelization scheme.
  
-An increasing number of large survey projects use a unique hierarchical pixelization of the celestial sphere called [[http://healpix.jpl.nasa.gov|HEALPix]].+An increasing number of large survey projects use a unique hierarchical pixelization of the celestial sphere called [[https://irsa.ipac.caltech.edu/​healpix/​index.html|HEALPix]].
 CADE pursues a strategy of ancillary data ingestion in the HEALPix format, generating partial or all-sky HEALPix files from astronomical data that is represented using the more traditional local World Coordinate System (WCS) FITS format. The ingestion tool is based on the drizzling library, and uses a strategy where the surface of pixel intersection is computed as presented in Appendix A of Paradis et al., 2012, A&A, 543, 103. This method allows fast ingestion and guarantees the photometric accuracy of the transformation with minimal data loss during the transformation from a local WCS FITS map to HEALPix. CADE pursues a strategy of ancillary data ingestion in the HEALPix format, generating partial or all-sky HEALPix files from astronomical data that is represented using the more traditional local World Coordinate System (WCS) FITS format. The ingestion tool is based on the drizzling library, and uses a strategy where the surface of pixel intersection is computed as presented in Appendix A of Paradis et al., 2012, A&A, 543, 103. This method allows fast ingestion and guarantees the photometric accuracy of the transformation with minimal data loss during the transformation from a local WCS FITS map to HEALPix.