Latiss Master Calibrations Generation Procedure

Overview

This procedure describes how to execute the SAL Script to produce master calibrations for LATISS on the ScriptQueue from the LSST Operations and Visualization Enviroment (LOVE) at the Summit operational environment.

The script will have the option to:

  • command LSSTComCam to take a number of calibrations frames:
    • biases
    • darks
    • flats
  • call the corresponding Rubin Science Pipelines calibration generation pipetask to produce biases, darks, flats, defects and Photon Transfer Curves (PTCs) via the OCS-Controlled Pipeline System (OCPS),
  • verify the images taken using as reference the calibration generated in the previous step (see the package cp_verify and DMTN-101), or using pre-existing calibrations (via the generate_calibrations boolean parameter in the configuration file), and
  • certify the resulting calibration with a given range of validity dates.

For at least one type of test (as defined in DMTN-101), if the majority of tests fail in the majority of detectors and the majority of exposures, then the script will terminate by raising a RuntimeError after calculating the verification statistics, and the calibration will not be certified. The configuration parameters number_verification_tests_threshold_bias, number_verification_tests_threshold_dark, and number_verification_tests_threshold_flat will be used to define thresholds to decide whether the calibration will pass verification and should be certified or not. Currently, verification is only implemented for BIAS, DARK, and FLAT calibration types. If the configuration parameters do_defects and do_ptc are set to True, verification will be skipped for the DEFECTS and PTC calibrations and they will be automatically certified.

The script currently has the option (via the script_mode parameter in the configuration options) to:

  • take only biases,
  • take biases and darks, and
  • take biases, darks, and flats.

These options are constrained by the fact that one calibration depends on the existence of the previous one (i.e., to build a dark, a bias is necessary, and to build a flat, a dark and a bias are necessary).

If desired, defects can be constructed from darks and flats, and a PTC per detector per amplifier constructed from the flats. Note that the PTC assumes that a sequence of flat pairs has been taken, each pair taken at the same exposure time. In both cases, script_mode must be set to BIAS_DARK_FLAT.

For more information about calibrations production (including verification and certification), please consult the Constructing Calibrations documentation.

Prerequisites

  • You should be logged into the LSST Operations and Visualization Enviroment (LOVE) at the Summit operational environment.
  • The script assumes (and checks) that the LATISS and OCPS components are all ENABLED, and that the latter has been ENABLED with the configuration of LATISS.
The instrument and the OCPS can be enabled with the following procedures:
If you plan to take flat fields as well, make sure the Auxiliary Telescope is prepared to do so:

Post-Condition

  • A (daily) master calibration image per detector will be certified in a butler CALIBRATION collection.

Procedure Steps

Once you are logged into LOVE, click on the ATQueue panel, as circled on the left side of the figure below (for reference, MTQueue to launch LSSTComCam scripts is circled on the right):

../../../_images/love-mtqueue-atqueue-panel.png

Load the Script

After clicking on the ATQueue panel, search for the script auxtel/make_latiss_calibrations.py under AVAILABLE SCRIPTS on the left, as shown in the figure below:

../../../_images/love-available-scripts.png

Load the script by clicking on the button in front of the name of the script that has a triangle.

Enter configuration parameters

After loading the script, a window that contains two sections, SCHEMA (top) and CONFIG (bottom), will appear. The former will show the available configuration options (and the default values of some of them) that should be entered in the latter. The configuration options are as follows:

  • script_mode: Currently, the script can be run in three modes, in which it will produce only biases (BIAS), biases and darks (BIAS_DARK), or biases, darks, and flats (BIAS_DARK_FLAT). Default: BIAS_DARK_FLAT
  • n_bias: number of bias frames to be taken. Default: 1
  • n_dark: number of dark frames to be taken. Default: 1
  • exp_times_dark: The exposure time of each dark image (sec). If a single value, then the same exposure time is used for each exposure. Default: 0
  • n_flat: number of flat frames to be taken. Default: 1
  • exp_times_flat: The exposure time of each flat image (sec). If a single value, then the same exposure time is used for each exposure. Default: 0
  • detectors: Detector IDs, e.g., (0,1,2,3,4,5,6,7,8) for all LATISS CCDs. Default: “(0,1,2,3,4,5,6,7,8)”
  • do_verify: Should the master calibrations be verified? (c.f., cp_verify). Default: True
  • generate_calibrations: Should the master calibrations be generated from the images taken and use them as reference for image verification? If False and and do_verify = True, pre-existing calibrations will be used as reference for verification, and they should be provided in the input collections for the verification pipetasks. Default: False
  • config_options_bias: Options to be passed to the command-line bias pipetask. They will overwrite the values in cpBias.yaml. Default: “-c isr:doDefect=False -c isr:doLinearize=False -c isr:doCrosstalk=False -c isr:overscan.fitType=’MEDIAN_PER_ROW’”
  • config_options_dark: Options to be passed to the command-line dark pipetask. They will overwrite the values in cpDark.yaml. Default: “-c isr:doDefect=False -c isr:doLinearize=False -c isr:doCrosstalk=False”
  • config_options_flat: Options to be passed to the command-line flat pipetask. They will overwrite the values in cpFlat.yaml. Default: “-c isr:doDefect=False -c isr:doLinearize=False -c isr:doCrosstalk=False -c cpFlatMeasure:doVignette=False “
  • do_defects: Should defects be built using darks and flats?. script_mode must be BIAS_DARK_FLAT.Default: False
  • config_options_defects: Options to be passed to the command-line defects pipetask. They will overwrite the values in findDefects.yaml. Default: “-c isr:doDefect=False “
  • do_ptc: Should a Photon Transfer Curve be constructed from the flats taken? script_mode must be BIAS_DARK_FLAT. Default: False
  • config_options_ptc: Options to be passed to the command-line PTC pipetask. They will overwrite the values in measurePhotonTransferCurve.yaml. Default: “-c ptcSolve:ptcFitType=EXPAPPROXIMATION -c isr:doCrosstalk=False “
  • input_collections_bias: List of additional (the OCPS already adds LATISS/raw/all as a default) comma-separated input collections for the bias pipetask. The pipetask is called via the OCPS after enabling it with the LATISS configuration. Default: “LATISS/calib”.
  • input_collections_verify_bias: Additional comma-separated input collections to pass to the verify (bias) pipetask. Default: “LATISS/calib”.
  • input_collections_dark: Additional comma-separarted input collections to pass to the dark pipetask. Default: “LATISS/calib”
  • input_collections_verify_dark: Additional comma-separated input collections to pass to the verify (dark) pipetask. Default: “LATISS/calib”
  • input_collections_flat: Additional comma-separated input collections to pass to the flat pipetask. Default: “LATISS/calib”
  • input_collections_verify_flat: Additional comma-separated input collections to pass to the verify (flat) pipetask. Default: “LATISS/calib”
  • input_collections_defects: Additional comma-separated input collections to pass to the defects pipetask. Default: “LATISS/calib”
  • input_collections_ptc: Additional comma-separated input collections to pass to the Photon Transfer Curve pipetask. Default: “LATISS/calib”
  • calib_collection: CALIBRATION collection where the calibrations will be certified into, for example, LATISS/calib/u/plazas/YYYYMMMDD.test. Default: “LATISS/calib/daily”.
  • repo: Butler repository. Default: /repo/LATISS.
  • n_processes: Number of processes that the pipetasks will use. Default: 8
  • certify_calib_begin_date: The beginning date for the validity range of the certified calibration. For example, 2021-07-15. Default: “1950-01-01”
  • certify_calib_end_date: The end date for the validity range of the certified calibration. For example, 2021-07-16. Default: “2050-01-01”
  • oods_timeout: Timeout value, in seconds, for the Observatory Operations Data Service (OODS). Default: 120

An example set of configuration parameters is as follows:

n_bias: 6
n_dark: 6
exp_times_dark: [5, 5, 5, 10, 15, 20]
n_flat: 14
exp_times_flat: [0.1, 0.1, 0.35, 0.35, 0.6, 0.6, 0.8, 0.8, 1.0, 1.0, 1.35, 1.35, 1.6, 1.6]
detectors: (0,1,2,3,4,5,6,7,8)
calib_collection: "LATISS/calib/u/plazas/daily.2021SEP13.test1"
do_verify: True
input_collections_verify_bias: "u/czw/DM-28920/calib.20210720,LATISS/calib"
input_collections_verify_dark: "u/czw/DM-28920/calib.20210720,LATISS/calib"
input_collections_verify_flat: "u/czw/DM-28920/calib.20210720,LATISS/calib"
certify_calib_begin_date: "2021-07-15"
certify_calib_end_date: "2021-07-17"
script_mode: BIAS_DARK_FLAT
do_defects: True
do_ptc: True

Launch the script

When the configuration options have been entered and the script is ready to be launched, click on the ADD button in the lower right of the screen (refer to image above).

Accessing the calibrations

The certified master calibrations will be available via the collection specified by the calib_collection parameter. They could be retrieved from a notebook for manipulation and visualization:

import lsst.daf.butler as dB

butler = dB.Butler("/repo/LATISS", collections=["LATISS/calib/daily.2021SEP13.test1"])
detector = (0, 1, 2, 3, 4, 5, 6, 7, 8)
exposure = [bias1ID, bias2ID] # e.g., [2021071500001, 2021071500002]

# For detector "0":
bias = butler.get('bias', detector=detector[0], exposure=exposure[0], instrument='LATISS')
dark = butler.get('dark', detector=detector[0], exposure=exposure[0], instrument='LATISS')
flat = butler.get('flat', detector=detector[0], exposure=exposure[0], instrument='LATISS')
defects = butler.get('defects', detector=detector[0], exposure=exposure[0], instrument='LATISS')
ptc = butler.get('ptc', detector=detector[0], exposure=exposure[0], instrument='LATISS')

In addition, the statistics produced by the verification step can be analized by looking into the examples folder in cp_verify.

Troubleshooting

After checking the configuration options and the LOVE error messages, the file /scratch/uws/${jobId}/outs/ocps.log will contain additional technical information on which pipetask failed, if any. {jobId} is returned by the OCPS and can be retrieved from the LOVE output messages.

Contact Personnel

This procedure was last modified on Feb 22, 2022.

This procedure was written by Andrés A. Plazas Malagón. The following are contributors: none.