Iau2006XysData

Iau2006XysData

new

A set of IAU2006 XYS data that is used to evaluate the transformation between the International Celestial Reference Frame (ICRF) and the International Terrestrial Reference Frame (ITRF).

Parameters:
Name Type Argument Default Description
description.xysFileUrlTemplate String <optional>
'Assets/IAU2006_XYS/IAU2006_XYS_{0}.json' A template URL for obtaining the XYS data. In the template, `{0}` will be replaced with the file index.
description.interpolationOrder Number <optional>
9 The order of interpolation to perform on the XYS data.
description.sampleZeroJulianEphemerisDate Number <optional>
2442396.5 The Julian ephemeris date (JED) of the first XYS sample.
description.stepSizeDays Number <optional>
1.0 The step size, in days, between successive XYS samples.
description.samplesPerXysFile Number <optional>
1000 The number of samples in each XYS file.
description.totalSamples Number <optional>
27426 The total number of samples in all XYS files.
Source:

Methods

Computes the XYS values for a given date by interpolating. If the required data is not yet downloaded, this method will return undefined.

Parameters:
Name Type Argument Description
dayTT Number The Julian day number for which to compute the XYS value, expressed in the Terrestrial Time (TT) time standard.
secondTT Number The seconds past noon of the date for which to compute the XYS value, expressed in the Terrestrial Time (TT) time standard.
result Iau2006XysSample <optional>
The instance to which to copy the interpolated result. If this parameter is undefined, a new instance is allocated and returned.
Returns:
Iau2006XysSample The interpolated XYS values, or undefined if the required data for this computation has not yet been downloaded.
See:

Preloads XYS data for a specified date range.

Parameters:
Name Type Description
startDayTT Number The Julian day number of the beginning of the interval to preload, expressed in the Terrestrial Time (TT) time standard.
startSecondTT Number The seconds past noon of the beginning of the interval to preload, expressed in the Terrestrial Time (TT) time standard.
stopDayTT Number The Julian day number of the end of the interval to preload, expressed in the Terrestrial Time (TT) time standard.
stopSecondTT Number The seconds past noon of the end of the interval to preload, expressed in the Terrestrial Time (TT) time standard.
Returns:
Promise A promise that, when resolved, indicates that the requested interval has been preloaded.