DifferenceImageTemplateInfo

pydantic model lsst.images.DifferenceImageTemplateInfo

Information about how a template image contributed to a difference image.

Parameters:

data (Any)

Fields:

• bounds (lsst.images._polygon.Polygon)

• dataset_id (uuid.UUID)

• dataset_run (str)

• patch (int)

• psf_shape_flag (bool)

• psf_shape_xx (float)

• psf_shape_xy (float)

• psf_shape_yy (float)

• skymap (str)

• tract (int)

field bounds: Polygon [Required]

The approximate intersection of the template and the science image, in the science image’s pixel coordinate system.

field dataset_id: uuid.UUID [Required]

Universally unique butler identifier for this template.

field dataset_run: str [Required]

Name of the butler RUN collection for this template.

field patch: int [Required]

ID of the patch (all patches within a tract share a projection).

field psf_shape_flag: bool [Required]

Flag set if the second moments of the effective template PSF could not be computed.

field psf_shape_xx: float [Required]

Second moment of the effective PSF of the template.

field psf_shape_xy: float [Required]

Second moment of the effective PSF of the template.

field psf_shape_yy: float [Required]

Second moment of the effective PSF of the template.

field skymap: str [Required]

Name of the skymap that defines the tract/patch tiling.

field tract: int [Required]

ID of the tract (each tract is a different projection).

static from_legacy(detector_frame, legacy_template_psf, legacy_template_metadata, coadd_data_ids_by_uuid, coadd_dataset_type='template_coadd', log=None)

Construct a list of template information structs from information stored in a legacy stitched template image.

Parameters:

• detector_frame (DetectorFrame) – Coordinate system and bounding box of the science image.

• legacy_template_psf (TypeAliasType) – The lazy-evaluation PSF model for the stitched template; used to extract the tract and patch IDs of the coadds actually used and their PSF models.

• legacy_template_metadata (Mapping[str, Any]) – The FITS-style metadata of the stitched template; used to extract butler UUIDs and RUN collection names for all potential input coadds.

• coadd_data_ids_by_uuid (Mapping[UUID, DataCoordinate | Mapping[str, Any]]) – A mapping from butler dataset ID to {tract, patch, band} data ID for all coadds that may have contributed to the template. May be a much larger superset of the needed datasets.

• coadd_dataset_type (str, default: 'template_coadd') – The name of the coadd template dataset type.

• log (Logger | None, default: None) – Logger to use for diagnostic messages.

Return type:

list[DifferenceImageTemplateInfo]