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LSST Data Management Base Package
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makeDiscreteSkyMap.py
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1# This file is part of pipe_tasks.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (http://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <http://www.gnu.org/licenses/>.
21
22from lsst.daf.butler import Butler
23from lsst.resources import ResourcePath
24from lsst.skymap import BaseSkyMap
25from lsst.pipe.tasks.makeDiscreteSkyMap import MakeDiscreteSkyMapTask, MakeDiscreteSkyMapConfig
26from lsst.pipe.base import Instrument
27
28
29def makeDiscreteSkyMap(repo, config_file, collections, instrument,
30 skymap_id='discrete', old_skymap_id=None):
31 """Implements the command line interface `butler make-discrete-skymap` subcommand,
32 should only be called by command line tools and unit test code that tests
33 this function.
34
35 Constructs a skymap from calibrated exposure in the butler repository
36
37 Parameters
38 ----------
39 repo : `str`
40 URI to the location to read the repo.
41 config_file : `str` or `None`
42 URI to a config file that contains overrides to the skymap config.
43 collections : `list` [`str`]
44 An expression specifying the collections to be searched (in order) when
45 reading datasets, and optionally dataset type restrictions on them.
46 At least one collection must be specified. This is the collection
47 with the calibrated exposures.
48 instrument : `str`
49 The name or fully-qualified class name of an instrument.
50 skymap_id : `str`, optional
51 The identifier of the skymap to save. Default is 'discrete'.
52 old_skymap_id : `str`, optional
53 The identifer of the skymap to append to. Must differ from
54 ``skymap_id``. Ignored unless ``config.doAppend=True``.
55 """
56 butler = Butler(repo, collections=collections, writeable=True)
57 instr = Instrument.from_string(instrument, butler.registry)
59 instr.applyConfigOverrides(MakeDiscreteSkyMapTask._DefaultName, config)
60
61 if config_file is not None:
62 resource = ResourcePath(config_file)
63 with resource.as_local() as local_config:
64 config.load(local_config.ospath)
65
66 # The coaddName for a SkyMap is only relevant in Gen2, and we completely
67 # ignore it here; once Gen2 is gone it can be removed.
68 oldSkyMap = None
69 if config.doAppend:
70 if old_skymap_id is None:
71 raise ValueError("old_skymap_id must be provided if config.doAppend is True.")
72 dataId = {'skymap': old_skymap_id}
73 try:
74 oldSkyMap = butler.get(BaseSkyMap.SKYMAP_DATASET_TYPE_NAME, collections=collections,
75 dataId=dataId)
76 except LookupError as e:
77 msg = (f"Could not find seed skymap with dataId {dataId} "
78 f"in collections {collections} but doAppend is {config.doAppend}. Aborting...")
79 raise LookupError(msg, *e.args[1:])
80
81 datasets = butler.registry.queryDatasets('calexp', collections=collections)
82 wcs_bbox_tuple_list = [(butler.get(ref.makeComponentRef("wcs")),
83 butler.get(ref.makeComponentRef("bbox")))
84 for ref in datasets]
85 task = MakeDiscreteSkyMapTask(config=config)
86 result = task.run(wcs_bbox_tuple_list, oldSkyMap)
87 result.skyMap.register(skymap_id, butler)