Introduction

The purpose of this section is to describe the data product of the VIS processing function. The description present in this section corresponds to the version of the VIS pipeline used in the current processing.

The VIS processing function produces two types of data products: images and catalogues together with calibration data. These are produced for both calibrated individual exposures and stacked images. In addition, there are auxiliary pixel data products associated with each of these images: noise map and Flagmap. For stacked images, overlapping images are combined to produce contiguous sky coverage at each survey pointing. The dither patterns used are defined in the mission database. These final products are delivered to other OUs (MER-SHE-NIR).

Two calibrated frame product are listed here: DpdVisCalibratedFrame and DpdVisCalibratedQuadFrame. The product DpdVisCalibratedQuadFrame is introduced in the PF-14. As a result, the product DpdVisCalibratedFrame is depreciated since this version.

PF version

Many changes are introduced with each PF release. It is important to verify the PF version of your data prior to its use. The modifications implemented by each version are enumerated in the respective product documentation.

The table below summarises the date of introduction of each major PF release in the On The Fly processing.

PF version	Date	Remarque
PF 13.0	2023/07/01	PV-phase
PF 14.0	2024/02/14	Survey start
PF 15.0	2024/05/24	Version used for reprocessing 1
PF 17.0	2024/09/23	DM 10 version, used for Q1
PF 18.0	2025/01/20	RR2/DR1 version
PF 18.1	2025/03/24	OTF version
PF 18.4	2025/10/22	OTF version
PF 18.5	TBD	OTF version

VIS data product

VIS output data product

Data Product	Ddp Name
Vis Calibrated Quad Frame Product	DpdVisCalibratedQuadFrame
Vis Calibrated Catalogue Product	DpdVisCalibratedFrameCatalog
Vis Stacked Frame Product	DpdVisStackedFrame
Vis Stacked Catalogue Product	DpdVisStackedFrameCatalog
Vis Diffraction Spikes Focus Product	DpdVisDiffractionSpikesFocus
Vis Flag Map Product	DpdVisFlagMap
Vis Analysis Results Product	DpdVisAnalysisResults
Vis Ghost Catalogue Product	DpdVisGhostCatalogue
Vis PSF Model Product	DpdVisPSFModel

VIS calibration data product

Data Product	Ddp Name
Vis Brighter Fatter Product	DpdVisBFEModel
Vis Blooming Model Product	DpdVisBloomingModel
Vis Configuration File Product	DpdVisConfigurationFile
Vis CTI Calibration Results Product	DpdVisCTICalibrationResults
Vis CTI Model Product	DpdVisCTIModel
Vis CTI Time Evolution Model Product	DpdVisCTITimeEvolutionModel
Vis Distortion Model Product	DpdVisDistortionModel
Vis File Container Product	DpdVisFileContainer
Vis Gain Model Product	DpdVisGainModel
Vis Ghost Position Model Product	DpdVisGhostModel
Vis Large Flat Frame Product	DpdVisLargeFlatFrame
Vis Master Bias Frame Product	DpdVisMasterBiasFrame
Vis Master CI Frame Product	DpdVisMasterCIFrame
Vis Master Dark Frame Product	DpdVisMasterDarkFrame
Vis Master Flat Frame Product	DpdVisMasterFlatFrame
Vis Non Linearity Model Product	DpdVisNonLinearityModel
Vis RON Model Product	DpdVisRONModel
Vis Shutter Model Product	DpdVisShutterModel
Vis Star Mask Product	DpdVisStarMask
Vis Trap Pumping Model Product	DpdVisTrapPumpingModel
Vis Trap Pumping Results Product	DpdVisTrapPumpingResults
Vis XTalk Frame Product	DpdVisXTalkModel
Vis Zero PointProduct	DpdVisZeroPoint

VIS deprecated model

These models are still present in the DM10 but are not produced.

Data Product	Ddp Name
Vis Calibrated Frame Product	DpdVisCalibratedFrame
Vis Pixel Bounce Product	DpdVisPixelBounceModel
Vis Persistence Model Product	DpdVisPersistenceModel
Vis Non Linearity Correction Product	DpdVisNonLinearityCorrection
Vis Validation Requirements Data Product	DpdVisValidationRequirements
Vis Validation Result Data Product	DpdVisValidationResult

VIS pipeline

The figure below describe the VIS processing.

Input calibration products are shown on the left and output are on the right.

The first part in the VIS processing function is pixel correction.

Then we do photometric and astrometric calibration and catalogue extraction. The output products from this stage are the data products which have been delivered for the Q1 release.

Stacking of individual exposure is done with this final processing elements.