AssembleCcdTask¶

class lsst.ip.isr.AssembleCcdTask(**kwargs)¶

Bases: lsst.pipe.base.Task

@brief Assemble a set of amplifier images into a full detector size set of pixels.

@section ip_isr_assemble_Contents Contents

@ref ip_isr_assemble_Purpose

@ref ip_isr_assemble_Initialize

@ref ip_isr_assemble_IO

@ref ip_isr_assemble_Config

@ref ip_isr_assemble_Debug

@ref ip_isr_assemble_Example

@section ip_isr_assemble_Purpose Description

This task assembles sections of an image into a larger mosaic. The sub-sections are typically amplifier sections and are to be assembled into a detector size pixel grid. The assembly is driven by the entries in the raw amp information. The task can be configured to return a detector image with non-data (e.g. overscan) pixels included. The task can also renormalize the pixel values to a nominal gain of 1. The task also removes exposure metadata that has context in raw amps, but not in trimmed detectors (e.g. ‘BIASSEC’).

@section ip_isr_assemble_Initialize Task initialization

@copydoc __init__

@section ip_isr_assemble_IO Inputs/Outputs to the assembleCcd method

@copydoc assembleCcd

@section ip_isr_assemble_Config Configuration parameters

See @ref AssembleCcdConfig

@section ip_isr_assemble_Debug Debug variables

The command line task interface supports a flag @c -d to import @b debug.py from your @c PYTHONPATH; see <a href=”https://developer.lsst.io/stack/debug.html”>Debugging Tasks with lsstDebug</a> for more about @b debug.py files.

The available variables in AssembleCcdTask are: <DL>

<DT> @c display <DD> A dictionary containing debug point names as keys with frame number

as value. Valid keys are:

<DL>

<DT> assembledExposure <DD> display assembled exposure

</DL>

</DL>

@section ip_isr_assemble_Example A complete example of using AssembleCcdTask

<HR> To investigate the @ref ip_isr_assemble_Debug, put something like @code{.py} import lsstDebug def DebugInfo(name):

di = lsstDebug.getInfo(name) # N.b. lsstDebug.Info(name) would call

# us recursively

if name == “lsst.ip.isr.assembleCcdTask”:

di.display = {‘assembledExposure’:2}

return di

lsstDebug.Info = DebugInfo @endcode into your debug.py file and run runAssembleTask.py with the @c –debug flag.

Conversion notes:: Display code should be updated once we settle on a standard way of controlling what is displayed.

Methods Summary

`assembleCcd`(assembleInput)	!Assemble a set of amps into a single CCD size image @param[in] assembleInput – Either a dictionary of amp lsst.afw.image.Exposures or a single lsst.afw.image.Exposure containing all raw amps.
`emptyMetadata`()	Empty (clear) the metadata for this Task and all sub-Tasks.
`getAllSchemaCatalogs`()	Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.
`getFullMetadata`()	Get metadata for all tasks.
`getFullName`()	Get the task name as a hierarchical name including parent task names.
`getName`()	Get the name of the task.
`getSchemaCatalogs`()	Get the schemas generated by this task.
`getTaskDict`()	Get a dictionary of all tasks as a shallow copy.
`makeField`(doc)	Make a `lsst.pex.config.ConfigurableField` for this task.
`makeSubtask`(name, **keyArgs)	Create a subtask as a new instance as the `name` attribute of this task.
`postprocessExposure`(outExposure, inExposure)	Set exposure non-image attributes, including wcs and metadata and display exposure (if requested)
`timer`(name, logLevel)	Context manager to log performance data for an arbitrary block of code.

Methods Documentation

assembleCcd(assembleInput)¶

!Assemble a set of amps into a single CCD size image @param[in] assembleInput – Either a dictionary of amp

lsst.afw.image.Exposures or a single lsst.afw.image.Exposure containing all raw amps. If a dictionary of amp exposures, the key should be the amp name.

@return assembledCcd – An lsst.afw.image.Exposure of the assembled: amp sections.

@throws TypeError with the following string:

<DL>

<DT> Expected either a dictionary of amp exposures or a single raw: exposure.
<DD> The input exposures to be assembled do not adhere to the: required format.

</DL>

@throws RuntimeError with the following string:

<DL>: <DT> No ccd detector found <DD> The detector set on the input exposure is not set.

</DL>

emptyMetadata() → None¶: Empty (clear) the metadata for this Task and all sub-Tasks.

getAllSchemaCatalogs() → Dict[str, Any]¶

Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.

Returns:	schemacatalogs : `dict` Keys are butler dataset type, values are a empty catalog (an instance of the appropriate `lsst.afw.table` Catalog type) for all tasks in the hierarchy, from the top-level task down through all subtasks.

Notes

This method may be called on any task in the hierarchy; it will return the same answer, regardless.

The default implementation should always suffice. If your subtask uses schemas the override Task.getSchemaCatalogs, not this method.

getFullMetadata() → lsst.pipe.base._task_metadata.TaskMetadata¶

Get metadata for all tasks.

Returns:	metadata : `TaskMetadata` The keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc.

Notes

The returned metadata includes timing information (if @timer.timeMethod is used) and any metadata set by the task. The name of each item consists of the full task name with . replaced by :, followed by . and the name of the item, e.g.:

topLevelTaskName:subtaskName:subsubtaskName.itemName

using : in the full task name disambiguates the rare situation that a task has a subtask and a metadata item with the same name.

getFullName() → str¶

Get the task name as a hierarchical name including parent task names.

Returns:	fullName : `str` The full name consists of the name of the parent task and each subtask separated by periods. For example: The full name of top-level task “top” is simply “top”. The full name of subtask “sub” of top-level task “top” is “top.sub”. The full name of subtask “sub2” of subtask “sub” of top-level task “top” is “top.sub.sub2”.

getName() → str¶

Get the name of the task.

Returns:	taskName : `str` Name of the task.

See also

Task.getAllSchemaCatalogs

Notes

Warning

Subclasses that use schemas must override this method. The default implementation returns an empty dict.

This method may be called at any time after the Task is constructed, which means that all task schemas should be computed at construction time, not when data is actually processed. This reflects the philosophy that the schema should not depend on the data.

Returning catalogs rather than just schemas allows us to save e.g. slots for SourceCatalog as well.

getTaskDict() → Dict[str, weakref.ReferenceType[lsst.pipe.base.task.Task]]¶

Get a dictionary of all tasks as a shallow copy.

Returns:	taskDict : `dict` Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc.

classmethod makeField(doc: str) → lsst.pex.config.configurableField.ConfigurableField¶

Make a lsst.pex.config.ConfigurableField for this task.

Parameters:	doc : `str` Help text for the field.
Returns:	configurableField : `lsst.pex.config.ConfigurableField` A `ConfigurableField` for this task.

Examples

Provides a convenient way to specify this task is a subtask of another task.

Here is an example of use:

class OtherTaskConfig(lsst.pex.config.Config):
    aSubtask = ATaskClass.makeField("brief description of task")

makeSubtask(name: str, **keyArgs) → None¶

Create a subtask as a new instance as the name attribute of this task.

Parameters:	name : `str` Brief name of the subtask. keyArgs Extra keyword arguments used to construct the task. The following arguments are automatically provided and cannot be overridden: “config”. “parentTask”.

Notes

The subtask must be defined by Task.config.name, an instance of ConfigurableField or RegistryField.

postprocessExposure(outExposure, inExposure)¶

Set exposure non-image attributes, including wcs and metadata and display exposure (if requested)

Call after assembling the pixels

@param[in,out] outExposure assembled exposure:

removes unwanted keywords
sets wcs, filter, and detector

@param[in] inExposure input exposure

timer(name: str, logLevel: int = 10) → Iterator[None]¶

Context manager to log performance data for an arbitrary block of code.

Parameters:	name : `str` Name of code being timed; data will be logged using item name: `Start` and `End`. logLevel A `logging` level constant.

Navigation

AssembleCcdTask¶