Random Catalog Product¶

Metadata¶

Data product name	DpdLE3IDVMSPRandomCatalog
Data product custodian	IDVMSP
Name of the Schema file	`euc-le3-id-vmsp-randomcatalog.xsd <https://gitlab.euclid-sgs.uk/ST-DM/ST_DataModel/-/blob/1 0.1.2/ST_DM_Schema/auxdir/ST_DM_Schema/dpd/le3/id/vmsp/out/euc-le3-id-vmsp-randomcatalog.xsd >`_
Last Edited for DPDD Version	1.1
Processing Element(s) creating/using the data product	Creators: VMSP_Sample Consumers SEL_Select SWG-GC, SWG-GAE
Processing function using the data product	ID-SEL VMSP pipeline uses this product to produce outputs for LE3 GC. SWG-GC uses this product.
Proposed for inclusion in EAS/SAS	This product is proposed for inclusion in the SAS: yes The VMSP random catalog product is necessary for the GC-SWG to build additional galaxy samples for verification tests and science analyses.

Data Product Elements¶

Header	object of type sys:genericHeader
Data	object of type vmsp:vmspRandomCatalog
QualityFlags	object of type vmsp:vmspRandomCatalogDqc
Parameters	object of type ppr:genericKeyValueParameters

Detailed Description of the Data Product¶

This product contains the random catalog constructed by ID VMSP, which characterizes the spectroscopic selection function of the Euclid Wide survey. The number density of the random catalog is at least 50x that of the galaxy catalog. The catalog consists of randomly sampled positions on the sky (right ascension and declination). In addition, each random point is tagged with galaxy properties, including redshift, fluxes and size. The weight column gives the probability that the random will be detected and measured at the given redshift.

The Euclid Wide survey is partitioned into tiles, and the data product represents a single tile.

The data file is in FITS format and contains a primary HDU and a binary table extension HDU.

Metadata¶

The metadata stored in the Data element of the XML contains useful information about the survey coverage. Here is a brief summary of the metadata:

Key	Type	Description
Area	float	Area of the random catalog (deg2).
Density	float	Density of the random catalog (/deg2).
CalblockIdList	CalblockIdList
Catalog	randomCatalogFile	Pointer to the FITS data file.
CatalogDescription	CatalogDescription
IslandLabelList	IslandLabelList
ObservationIdList	ObservationIdList
PatchIdList	PatchIdList
SpatialCoverage	SpatialCoverage
SpectralCoverage	SpectralCoverage
TileIndexList	TileIndexList
VmspCoverageMap	vmspCoverageMap	Healpix weight map.
VmspDetectorFootprintList	vmspDetectorFootprintList	The polygon footprint of detectors that overlap this tile.

FITS Keywords¶

This fits table is expected to contain the following keywords in primary HDU, characterizing the parameters of the product: