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LSST Data Management Base Package
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Public Member Functions | Protected Member Functions | List of all members
lsst.meas.algorithms.testUtils.MockReferenceObjectLoaderFromFiles Class Reference
Inheritance diagram for lsst.meas.algorithms.testUtils.MockReferenceObjectLoaderFromFiles:

Public Member Functions

 __init__ (self, filenames, name='cal_ref_cat', config=None, htmLevel=4)
 

Protected Member Functions

 _createDataIdsAndRefcats (self, filenames, htmLevel, name)
 

Detailed Description

A mock of ReferenceObjectLoader using files on disk.

This mock ReferenceObjectLoader uses a set of files on disk to create
mock dataIds and data reference handles that can be accessed
without a butler. The files must be afw catalog files in the reference
catalog format, sharded with HTM pixelization.

Parameters
----------
filenames : `list` [`str`]
    Names of files to use.
config : `lsst.meas.astrom.LoadReferenceObjectsConfig`, optional
    Configuration object if necessary to override defaults.
htmLevel : `int`, optional
    HTM level to use for the loader.

Definition at line 209 of file testUtils.py.

Constructor & Destructor Documentation

◆ __init__()

lsst.meas.algorithms.testUtils.MockReferenceObjectLoaderFromFiles.__init__ ( self,
filenames,
name = 'cal_ref_cat',
config = None,
htmLevel = 4 )

Definition at line 226 of file testUtils.py.

226 def __init__(self, filenames, name='cal_ref_cat', config=None, htmLevel=4):
227 dataIds, refCats = self._createDataIdsAndRefcats(filenames, htmLevel, name)
228
229 super().__init__(dataIds, refCats, name=name, config=config)
230

Member Function Documentation

◆ _createDataIdsAndRefcats()

lsst.meas.algorithms.testUtils.MockReferenceObjectLoaderFromFiles._createDataIdsAndRefcats ( self,
filenames,
htmLevel,
name )
protected
Create mock dataIds and refcat handles.

Parameters
----------
filenames : `list` [`str`]
    Names of files to use.
htmLevel : `int`
    HTM level to use for the loader.
name : `str`
    Name of reference catalog (for logging).

Returns
-------
dataIds : `list` [`MockRefcatDataId`]
    List of mock dataIds.
refCats : `list` [`lsst.pipe.base.InMemoryDatasetHandle`]
    List of mock deferred dataset handles.

Raises
------
RuntimeError if any file contains sources that cover more than one HTM
    pixel at level ``htmLevel``.

Definition at line 231 of file testUtils.py.

231 def _createDataIdsAndRefcats(self, filenames, htmLevel, name):
232 """Create mock dataIds and refcat handles.
233
234 Parameters
235 ----------
236 filenames : `list` [`str`]
237 Names of files to use.
238 htmLevel : `int`
239 HTM level to use for the loader.
240 name : `str`
241 Name of reference catalog (for logging).
242
243 Returns
244 -------
245 dataIds : `list` [`MockRefcatDataId`]
246 List of mock dataIds.
247 refCats : `list` [`lsst.pipe.base.InMemoryDatasetHandle`]
248 List of mock deferred dataset handles.
249
250 Raises
251 ------
252 RuntimeError if any file contains sources that cover more than one HTM
253 pixel at level ``htmLevel``.
254 """
255 pixelization = sphgeom.HtmPixelization(htmLevel)
256 htm = esutil.htm.HTM(htmLevel)
257
258 dataIds = []
259 refCats = []
260
261 for filename in filenames:
262 cat = afwTable.BaseCatalog.readFits(filename)
263
264 ids = htm.lookup_id(np.rad2deg(cat['coord_ra']), np.rad2deg(cat['coord_dec']))
265
266 if len(np.unique(ids)) != 1:
267 raise RuntimeError(f"File {filename} contains more than one pixel at level {htmLevel}")
268
269 dataIds.append(MockRefcatDataId(pixelization.pixel(ids[0])))
270 refCats.append(InMemoryDatasetHandle(cat, name=name))
271
272 return dataIds, refCats
273
274

The documentation for this class was generated from the following file: