Introduction

VMPZ-ID products, used in other LE3 Processing Functions, consist in (with increasing complexity):

VMPZ-ID is triggered at the MER tile level, where all products are first produced as (potentially weighted) MOC Healpix maps, at a given MOC order. In the following, this stage is named the stage 1.

A second step, prior to triggering other “client” LE3 processing functions implies “merging” the MOC maps, and a HEALPix partial map or MOC map is produced at the resolution prescribed by the user in the parameter files. Potential mangle maps could be derived from this product. In the following, this stage is named the stage 2.

VMPZ-ID masks and random catalogs will be available by tiles and for the full survey.

Survey footprint

For the survey footprint, beside parameters VMPZIDParamsFootprint the footprint requires:

  • for stage 1 (processing on MER tiles), products containing the list of coordinates describing the geometry of the survey for the set of given band/instrument are first ingested (e.g.: the ReconsFPAPointing in VIS VISObsFrame for NIR/VIS, the ImgSpatialFootprint in EXT CalibratedFrame if precise enough). The fraction of HEALPix pixel covered is reported in a VMPZIDMOCFootprintMask.

  • for stage 2 (processing at skypatch level), a set of MOC HEALPix Maps VMPZIDMOCFootprintMask are processed on the different MER tiles overlapping with the prescribed region.

The two stages will produce a VMPZIDHEALPixFootprintMask or VMPZIDMOCFootprintMask.This is the processing run for DR1-Foundation.

Bit Masks and coverage mask

The coverage masks correspond to regions of the survey footprint that have not been flagged using the bitmask. It is therefore the same format as the survey footprint, but the flagged areas are set to 1. Parameters are set in VMPZIDParamsCoverage.

The two stages will produce the product VMPZIDHEALPixCoverageMask or VMPZIDMOCCoverageMask. In case of sky patch processing, or a mangle file VMPZIDMangleCoverageMask can also be outputted, using VMPZIDParamsMangle parameter files.

For the bit masks, besides parameters VMPZIDParamsBitMask, and a HEALPix VMPZIDMOCFootprintMask, one would need:

  • for stage 1, the pixel flag maps defined in MER MERMosaic or (see in human readable format) for the different bands/instruments, to produce VMPZIDMOCBitMask

  • for stage 2, a set of VMPZIDMOCBitMask computed on the different MER tiles overlapping with the prescribed region to produce VMPZIDHEALPixBitMask or VMPZIDMOCBitMask

In case of sky patch processing, a mangle file VMPZIDMangleCoverageMask can also be outputed, using VMPZIDParamsMangle parameter files.

Instrumental/Environmental Information

Using parameters VMPZIDParamsInfoMaps, MOC maps of instrumental and environmental effects are first collected in a product VMPZIDMOCCollectInfoMaps. This implies to have access to all relevant statistics (mean/median/max/min) on relevant quantities to compute the limiting magnitude, such as PSF/seeing FWHM, background level, RMS map, exposureTime, airmass,solar aspect angle, zodiacal light emissions.

In the table below are listed a series of potential inputs to collect this maps.

Instrumental/ Environmental Parameters

Statistics

Instrument

Input Product

Noise

RMS (pixel)

MER

MERMosaic/Background-Subtracted Mosaic Product (RmsStorage)

Weights

RMS (pixel)

EXT

ExtCalibratedFrame (DataStorage)

Value

DES

DesCalibratedFrame (desObservation)

Value

KIDS

reducedScienceFrame (Weight)?

RMS (pixel)

LSST

ExtLssCalexp (lssCalexpFitsFile)

Exposures

TBD

VIS

VISCalibratedFrame (ObservationSequence)

TBD | NIR | NIR Calibrated Frame (ObservationSequence)

time

MER

MERMosaic/Background-Subtracted Mosaic Product (imgBaseFrame)

time

EXT

ExtCalibratedFrame (imgBaseFrame)

time

DES

DesCalibratedFrame (imgBaseFrame)

total time

KIDS

reducedScienceFrame (ExpTime single exposure)

time

LSST

ExtLssCalexp (imgBaseFrame)

PSF

FWHM

MER

MERMosaic or Background-Subtracted Mosaic Product (merPsfModelStorage)

FWHM

EXT

ExtPSF (extPsfModel, keyword FITS)

Seeing

median

DES

DesCalibratedFrame (PsfModelStorage, FHWM)

median

KIDS

reducedScienceFrame (Seeing)

LSST

ExtLssCalexp (lssPsfModelFitsFile ?)

Background

Pixel value

VIS

VISCalibratedFrame (BackgroundStorage)

Pixel value

NIR

NIR Calibrated Frame (BackgroundStorage)

Pixel value

MER

Background-Subtracted Mosaic Product (BackgroundStorage)

Pixel value

EXT

ExtCalibratedFrame (ext.detrendedFrame)

Pixel value

DES

DesCalibratedFrame (BackgroundStorage)

KIDS

?

LSST

ExtLssCalexp (lssCalexpFitsFile)

Airmass

?

DES

DesCalibratedFrame (desObservation) ?

?

KIDS

RawScienceFrame (AirmassStart/AirmassEnd) “

LSST

? (lssVisitInfo)

Atmospheric Extinction

DES

KIDS

photometricParameters (Extinction)

LSST

SAA

VIS

VISCalibratedFrame (ReconsOrbit)

NIR

NIR Calibrated Frame (ReconstructedOrbit)

Zodiacal Light

TBD

Depth Maps

The depth map is then estimated using parameters VMPZIDParamsDepth, and information collected in VMPZIDMOCCollectInfoMaps. In stage 1 MOC HEALPix maps VMPZIDMOCDepth are produced at the MER level, while in stage 2 the data is gathered at the sky patch level in either partial HEALPix maps VMPZIDHEALPixDepth or VMPZIDMOCDepth.

Photometric Visibility Mask and Random Catalog

These products were not produced for DR1-Foundation

Input products

  • VMPZIDParamsBitMask

  • VMPZIDParamsCoverage

  • VMPZIDParamsDepth

  • VMPZIDParamsFootprint

  • VMPZIDParamsInfoMap

  • VMPZIDParamsRandom

  • VMPZIDParamsVisibility

Output products