LSST Applications
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LSST Data Management Base Package
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Public Member Functions | |
def | __init__ (self, expId=0, expBits=1, maxBits=64) |
def | unusedBits (self) |
Public Attributes | |
expId | |
expBits | |
maxBits | |
Exposure ID and number of bits used. Attributes include: expId exposure ID as an int expBits maximum number of bits allowed for exposure IDs maxBits maximum number of bits available for values that combine exposure ID with other information, such as source ID unusedBits maximum number of bits available for non-exposure info (maxBits - expBits) One common use is creating an ID factory for making a source table. For example, given a data butler `butler` and a data ID `dataId`: .. code-block:: python from lsst.afw.table import IdFactory, SourceTable exposureIdInfo = butler.get("expIdInfo", dataId) sourceIdFactory = IdFactory.makeSource(exposureIdInfo.expId, exposureIdInfo.unusedBits) schema = SourceTable.makeMinimalSchema() #...add fields to schema as desired, then... sourceTable = SourceTable.make(self.schema, sourceIdFactory) At least one bit must be reserved, even if there is no exposure ID, for reasons that are not entirely clear (this is DM-6664).
Definition at line 25 of file exposureIdInfo.py.
def lsst.obs.base.exposureIdInfo.ExposureIdInfo.__init__ | ( | self, | |
expId = 0 , |
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expBits = 1 , |
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maxBits = 64 |
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Construct an ExposureIdInfo See the class doc string for an explanation of the arguments.
Definition at line 58 of file exposureIdInfo.py.
def lsst.obs.base.exposureIdInfo.ExposureIdInfo.unusedBits | ( | self | ) |
Definition at line 77 of file exposureIdInfo.py.
lsst.obs.base.exposureIdInfo.ExposureIdInfo.expBits |
Definition at line 73 of file exposureIdInfo.py.
lsst.obs.base.exposureIdInfo.ExposureIdInfo.expId |
Definition at line 72 of file exposureIdInfo.py.
lsst.obs.base.exposureIdInfo.ExposureIdInfo.maxBits |
Definition at line 74 of file exposureIdInfo.py.