public class TimeMap extends Mapping
When a TimeMap is first created, it simply performs a unit (null) Mapping. Using the astTimeAdd function, a series of coordinate conversion steps may then be added. This allows multistep conversions between a variety of time coordinate systems to be assembled out of a set of building blocks.
For details of the individual coordinate conversions available, see the description of the astTimeAdd function.
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Mapping.Interpolator, Mapping.Spreader
LINEAR_INTERPOLATOR, LINEAR_SPREADER, NEAREST_INTERPOLATOR, NEAREST_SPREADER
AST__BAD, AST__TUNULL, pointer
Constructor and Description 

TimeMap()
Create a TimeMap.

TimeMap(int flags)
Create a TimeMap.

Modifier and Type  Method and Description 

void 
timeAdd(String cvt,
double[] args)
Add a time coordinate conversion to a TimeMap.

decompose, getInvert, getNin, getNout, getReport, getTranForward, getTranInverse, invert, linearApprox, mapBox, mapSplit, rate, rebin, rebinD, rebinF, rebinI, resample, resampleB, resampleD, resampleF, resampleI, resampleL, resampleS, setInvert, setReport, simplify, tran1, tran2, tranGrid, tranN, tranP
annul, clear, copy, delete, equals, finalize, getAstConstantI, getB, getC, getD, getF, getI, getID, getIdent, getL, getNobject, getObjSize, getRefCount, hashCode, isThreaded, reportVersions, sameObject, set, setB, setC, setD, setF, setI, setID, setIdent, setL, show, test, tune
public TimeMap()
public TimeMap(int flags)
A TimeMap is a specialised form of 1dimensional Mapping which can be used to represent a sequence of conversions between standard time coordinate systems.
When a TimeMap is first created, it simply performs a unit (null) Mapping. Using the astTimeAdd function, a series of coordinate conversion steps may then be added. This allows multistep conversions between a variety of time coordinate systems to be assembled out of a set of building blocks.
For details of the individual coordinate conversions available, see the description of the astTimeAdd function.
flags
 This parameter is reserved for future use and should currently
always be set to zero.AstException
 if an error occurred in the AST librarypublic void timeAdd(String cvt, double[] args)
When a TimeMap is first created (using astTimeMap), it simply performs a unit (null) Mapping. By using astTimeAdd (repeatedly if necessary), one or more coordinate conversion steps may then be added, which the TimeMap will perform in sequence. This allows multistep conversions between a variety of time coordinate systems to be assembled out of the building blocks provided by this class.
Normally, if a TimeMap's Invert attribute is zero (the default), then its forward transformation is performed by carrying out each of the individual coordinate conversions specified by astTimeAdd in the order given (i.e. with the most recently added conversion applied last).
This order is reversed if the TimeMap's Invert attribute is nonzero (or if the inverse transformation is requested by any other means) and each individual coordinate conversion is also replaced by its own inverse. This process inverts the overall effect of the TimeMap. In this case, the first conversion to be applied would be the inverse of the one most recently added.
 "MJDTOMJD" (MJDOFF1,MJDOFF2): Convert MJD from one offset to another.
 "MJDTOJD" (MJDOFF,JDOFF): Convert MJD to Julian Date.
 "JDTOMJD" (JDOFF,MJDOFF): Convert Julian Date to MJD.
 "MJDTOBEP" (MJDOFF,BEPOFF): Convert MJD to Besselian epoch.
 "BEPTOMJD" (BEPOFF,MJDOFF): Convert Besselian epoch to MJD.
 "MJDTOJEP" (MJDOFF,JEPOFF): Convert MJD to Julian epoch.
 "JEPTOMJD" (JEPOFF,MJDOFF): Convert Julian epoch to MJD.
 "TAITOUTC" (MJDOFF): Convert a TAI MJD to a UTC MJD.
 "UTCTOTAI" (MJDOFF): Convert a UTC MJD to a TAI MJD.
 "TAITOTT" (MJDOFF): Convert a TAI MJD to a TT MJD.
 "TTTOTAI" (MJDOFF): Convert a TT MJD to a TAI MJD.
 "TTTOTDB" (MJDOFF, OBSLON, OBSLAT, OBSALT): Convert a TT MJD to a TDB MJD.
 "TDBTOTT" (MJDOFF, OBSLON, OBSLAT, OBSALT): Convert a TDB MJD to a TT MJD.
 "TTTOTCG" (MJDOFF): Convert a TT MJD to a TCG MJD.
 "TCGTOTT" (MJDOFF): Convert a TCG MJD to a TT MJD.
 "TDBTOTCB" (MJDOFF): Convert a TDB MJD to a TCB MJD.
 "TCBTOTDB" (MJDOFF): Convert a TCB MJD to a TDB MJD.
 "UTTOGMST" (MJDOFF): Convert a UT MJD to a GMST MJD.
 "GMSTTOUT" (MJDOFF): Convert a GMST MJD to a UT MJD.
 "GMSTTOLMST" (MJDOFF, OBSLON, OBSLAT): Convert a GMST MJD to a LMST MJD.
 "LMSTTOGMST" (MJDOFF, OBSLON, OBSLAT): Convert a LMST MJD to a GMST MJD.
 "LASTTOLMST" (MJDOFF, OBSLON, OBSLAT): Convert a GMST MJD to a LMST MJD.
 "LMSTTOLAST" (MJDOFF, OBSLON, OBSLAT): Convert a LMST MJD to a GMST MJD.
 "UTTOUTC" (DUT1): Convert a UT1 MJD to a UTC MJD.
 "UTCTOUT" (DUT1): Convert a UTC MJD to a UT1 MJD.
 "LTTOUTC" (LTOFF): Convert a Local Time MJD to a UTC MJD.
 "UTCTOLT" (LTOFF): Convert a UTC MJD to a Local Time MJD.
The units for the values processed by the above conversions are as follows:
 Julian epochs and offsets: Julian years
 Besselian epochs and offsets: Tropical years
 Modified Julian Dates and offsets: days
 Julian Dates and offsets: days
The arguments used in the above conversions are the zeropoints used by the astTransform function. The axis values supplied and returned by astTransform are offsets away from these zeropoints:
 MJDOFF: The zeropoint being used with MJD values.
 JDOFF: The zeropoint being used with Julian Date values.
 BEPOFF: The zeropoint being used with Besselian epoch values.
 JEPOFF: The zeropoint being used with Julian epoch values.
 OBSLON: Observer longitude in radians (+ve westwards).
 OBSLAT: Observer geodetic latitude (IAU 1975) in radians (+ve northwards).
 OBSALT: Observer geodetic altitude (IAU 1975) in metres.
 DUT1: The UT1UTC value to use.
 LTOFF: The offset between Local Time and UTC (in hours, positive
for time zones east of Greenwich).
cvt
 Pointer to a nullterminated string which identifies the
time coordinate conversion to be added to the
TimeMap. See the "Available Conversions" section for details of
those available.args
 An array containing argument values for the time
coordinate conversion. The number of arguments required, and
hence the number of array elements used, depends on the
conversion specified (see the "Available Conversions"
section). This array is ignored
and a NULL pointer may be supplied
if no arguments are needed.AstException
 if an error occurred in the AST libraryCopyright © 2024 Central Laboratory of the Research Councils. All Rights Reserved.