SkyPixSystem#

class lsst.daf.butler.SkyPixSystem(name: str, *, maxLevel: int, PixelizationClass: type[PixelizationABC])#

Class for hierarchical pixelization of the sky.

A TopologicalFamily that represents a hierarchical pixelization of the sky.

Parameters#

namestr: Name of the system.
maxLevelint: Maximum level (inclusive) of the hierarchy.
PixelizationClasstype (lsst.sphgeom.PixelizationABC subclass): Class whose instances represent a particular level of this pixelization.

Methods Summary

`choose`(dimensions)	Select the best member of this family to use.
`make_column_reference`(endpoint)	Create a column reference to the generalized region column for the given endpoint.

Methods Documentation

Select the best member of this family to use.

These are to be used in a query join or data ID when more than one is present.

Usually this should correspond to the most fine-grained region.

dimensionsDimensionGroup: Dimensions to choose from, if this is a dimension-based topological family.

bestTopologicalRelationshipEndpoint: The best endpoint from this family for these dimensions.

make_column_reference(endpoint: TopologicalRelationshipEndpoint) → DimensionFieldReference#

Create a column reference to the generalized region column for the given endpoint.

endpointTopologicalRelationshipEndpoint: Endpoint to create a column reference to.