MakeTestRawVisitInfo¶
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class
lsst.obs.test.
MakeTestRawVisitInfo
(log=None, doStripHeader=False)¶ Bases:
lsst.obs.base.MakeRawVisitInfo
Make a VisitInfo from the FITS header of a test image.
Notes
Since the test data is extracted from LSST Sim data, this is a copy of MakeLsstSimRawVisitInfo (using a copy avoids undesireable dependencies).
Attributes Summary
observatory
Methods Summary
__call__
(md, exposureId)Construct a VisitInfo and strip associated data from the metadata. altitudeFromZenithDistance
(zd)Convert zenith distance to altitude (lsst.afw.geom.Angle) centigradeFromKelvin
(tempK)Convert temperature from Kelvin to Centigrade defaultMetadata
(value, defaultValue[, …])Return the value if it is not NaN and within min/max, otherwise return defaultValue. eraFromLstAndLongitude
(lst, longitude)Return an approximate Earth Rotation Angle (afw:Angle) computed from local sidereal time and longitude (both as afw:Angle; Longitude shares the afw:Observatory covention: positive values are E of Greenwich). getDarkTime
(argDict)Get the darkTime from the DARKTIME keyword, else expTime, else NaN, getDateAvg
(md, exposureTime)Return date at the middle of the exposure. offsetDate
(date, offsetSec)Return a date offset by a specified number of seconds. pascalFromMBar
(mbar)Convert pressure from millibars to Pascals pascalFromMmHg
(mmHg)Convert pressure from mm Hg to Pascals pascalFromTorr
(torr)Convert pressure from torr to Pascals popAngle
(md, key[, units])Pop an lsst.afw.geom.Angle, whose metadata is in the specified units, with a default of Nan popFloat
(md, key)Pop a float with a default of NaN. popIsoDate
(md, key[, timesys])Pop a FITS ISO date as an lsst.daf.base.DateTime popItem
(md, key[, default])Return an item of metadata. popMjdDate
(md, key[, timesys])Get a FITS MJD date as an lsst.daf.base.DateTime
.setArgDict
(md, argDict)Set an argument dict for VisitInfo and pop associated metadata. Attributes Documentation
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observatory
= -70.7494W, -30.2446N 2663¶
Methods Documentation
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__call__
(md, exposureId)¶ Construct a VisitInfo and strip associated data from the metadata.
Parameters: - md :
lsst.daf.base.PropertyList
orlsst.daf.base.PropertySet
Metadata to pull from. Items that are used are stripped from the metadata (except TIMESYS, because it may apply to other keywords) if
doStripHeader
.- exposureId :
int
exposure ID
Notes
The basic implementation sets
date
andexposureTime
using typical values found in FITS files and logs a warning if neither can be set.- md :
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static
altitudeFromZenithDistance
(zd)¶ Convert zenith distance to altitude (lsst.afw.geom.Angle)
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static
centigradeFromKelvin
(tempK)¶ Convert temperature from Kelvin to Centigrade
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static
defaultMetadata
(value, defaultValue, minimum=None, maximum=None)¶ Return the value if it is not NaN and within min/max, otherwise return defaultValue.
Parameters: Returns: - `float`
The “validated” value.
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static
eraFromLstAndLongitude
(lst, longitude)¶ Return an approximate Earth Rotation Angle (afw:Angle) computed from local sidereal time and longitude (both as afw:Angle; Longitude shares the afw:Observatory covention: positive values are E of Greenwich).
NOTE: if we properly compute ERA via UT1 a la DM-8053, we should remove this method.
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getDarkTime
(argDict)¶ Get the darkTime from the DARKTIME keyword, else expTime, else NaN,
If dark time is available then subclasses should call this method by putting the following in their
__init__
method:argDict['darkTime'] = self.getDarkTime(argDict)
Parameters: - argdict :
dict
Dict of arguments.
Returns: - `float`
Dark time, as inferred from the metadata.
- argdict :
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getDateAvg
(md, exposureTime)¶ Return date at the middle of the exposure.
Parameters: - md :
lsst.daf.base.PropertySet
Image metadata.
- exposureTime :
float
Exposure time, in sec
Returns: - dateAvg :
lsst.daf.base.DateTime
Date at middle of the exposure, or
lsst.daf.base.DateTime()
if the metadata itemTAI
is not found.
- md :
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offsetDate
(date, offsetSec)¶ Return a date offset by a specified number of seconds.
- date :
lsst.daf.base.DateTime
- Date baseline to offset from.
- offsetSec :
float
- Offset, in seconds.
Returns: - `lsst.daf.base.DateTime`
The offset date.
- date :
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static
pascalFromMBar
(mbar)¶ Convert pressure from millibars to Pascals
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static
pascalFromMmHg
(mmHg)¶ Convert pressure from mm Hg to Pascals
Notes
Could use the following, but astropy.units.cds is not fully compatible with Python 2 as of astropy 1.2.1 (see https://github.com/astropy/astropy/issues/5350#issuecomment-248612824): astropy.units.cds.mmHg.to(astropy.units.pascal, mmHg)
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static
pascalFromTorr
(torr)¶ Convert pressure from torr to Pascals
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popAngle
(md, key, units=Unit("deg"))¶ Pop an lsst.afw.geom.Angle, whose metadata is in the specified units, with a default of Nan
The angle may be specified as a float or sexagesimal string with 1-3 fields.
Parameters: - md :
lsst.daf.base.PropertyList
orPropertySet
Metadata to pull
key
from.- key :
str
Key to read from md.
Returns: - `lsst.afw.geom.Angle`
Value of the requested key as an angle; Angle(NaN) if the key is not found.
- md :
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popFloat
(md, key)¶ Pop a float with a default of NaN.
Parameters: - md :
lsst.daf.base.PropertyList
orPropertySet
Metadata to pull
key
from.- key :
str
Key to read.
Returns: - `float`
Value of the requested key as a float; float(“nan”) if the key is not found.
- md :
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popIsoDate
(md, key, timesys=None)¶ Pop a FITS ISO date as an lsst.daf.base.DateTime
Parameters: - md :
lsst.daf.base.PropertyList
orPropertySet
Metadata to pull
key
from.- key :
str
Date key to read from md.
- timesys :
str
Time system as a string (not case sensitive), e.g. “UTC” or None; if None then look for TIMESYS (but do NOT pop it, since it may be used for more than one date) and if not found, use UTC.
Returns: - `lsst.daf.base.DateTime`
Value of the requested date;
DateTime()
if the key is not found.
- md :
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popItem
(md, key, default=None)¶ Return an item of metadata.
The item is removed if
doStripHeader
isTrue
.Log a warning if the key is not found.
Parameters: Returns: - `object`
The value of the specified key, using whatever type md.getScalar(key) returns.
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popMjdDate
(md, key, timesys=None)¶ Get a FITS MJD date as an
lsst.daf.base.DateTime
.Parameters: - md :
lsst.daf.base.PropertyList
orPropertySet
Metadata to pull
key
from.- key :
str
Date key to read from md.
- timesys :
str
Time system as a string (not case sensitive), e.g. “UTC” or None; if None then look for TIMESYS (but do NOT pop it, since it may be used for more than one date) and if not found, use UTC.
Returns: - `lsst.daf.base.DateTime`
Value of the requested date;
DateTime()
if the key is not found.
- md :
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setArgDict
(md, argDict)¶ Set an argument dict for VisitInfo and pop associated metadata.
Parameters: - md :
lsst.daf.base.PropertySet
Image metadata.
- argDict :
dict
A dict of arguments for the
lsst.afw.image.VisitInfo
constructor. Updated by this call.
Returns: - visitInfo :
lsst.afw.image.VisitInfo
Visit information.
- md :
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