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aeroReadIERSData

File containing current International Astronomical Union (IAU) 2000A Earth orientation data

Description

example

file=aeroReadIERSData(foldername) creates a MAT-file, file, based on IAU 2000A Earth orientation data from the International Earth Rotation and Reference Systems Service (IERS). It saves the file to foldername. file name has the format aeroiersdataYYYYMMDD.mat, where:

  • YYYY - Year

  • MM - Month

  • DD - Day

file=aeroReadIERSData(foldername,'url',urladdress) creates the MAT-file based on Earth orientation data from a specific web site or data file.

Examples

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Create the Earth orientation data file for the current day, in the current folder, using data from the default web site https://maia.usno.navy.mil/ser7/finals2000A.data.

aeroReadIERSData(pwd)

Create the Earth orientation file for the current day, in the current folder, using data from the alternate web site https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt.

aeroReadIERSData(pwd,'url','https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt')

Create the Earth orientation file for the current day, in the current folder, using data from a specified file file:///C:\Documents\final2000A.data.

aeroReadIERSData(pwd,'url','file:///C:\Documents\finals2000A.data')

Input Arguments

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Folder for IERS data file, specified as a character array or string. Before running this function, create foldername with write permission.

Data Types: char | string

Optional web site or file containing the IAU 2000A Earth orientation data, specified as a web site address or file name.

Note

If you receive an error message while accessing the default site, use one of these alternate sites:

  • https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt

  • ftp://ftp.iers.org/products/eop/rapid/standard/finals2000A.data

Example: https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt

Data Types: char | string

Output Arguments

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Location of Earth orientation data MAT-file, specified as a character array.

More About

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International Astronomical Union (IAU) 2000A Earth Orientation Data Format

The function expects the International Astronomical Union (IAU) 2000A Earth orientation data to use the format referenced here https://maia.usno.navy.mil/ser7/finals2000A.data:

ColumnDescription
1 to 2Year (to get true calendar year, add 1900 for MJD<=51543 or add 2000 for MJD>=51544)
3 to 4Month number
5 to 6Day of month
7Blank
8 to 15Fractional modified Julian date (MJD UTC)
16Blank
17IERS (I) or Prediction (P) flag for Bull. A polar motion values*
18Blank
19 to 27Bull. A PM-x (sec. of arc)*
28-36Error in PM-x (sec. of arc)*
37Blank
38-46Bull. A PM-y (sec. of arc)*
47-55Error in PM-y (sec. of arc)*
56-57Blank
58IERS (I) or Prediction (P) flag for Bulletin A UT1-UTC values*
59-68Bull. A UT1-UTC (sec. of time)*
69-78Error in UT1-UTC (sec. of time)*
79Blank
80-86Bull. A LOD (msec. of time) -- not always filled*
87-93Error in LOD (msec. of time) -- not always filled*
94-95Blank
96IERS (I) or Prediction (P) flag for Bull. A nutation values*
97Blank
98-106Bull. A dX wrt IAU2000A nutation (msec. of arc), free core nutation not removed*
107-115Error in dX (msec. of arc)
116Blank
117-125Bull. A dY wrt IAU2000A nutation (msec. of arc), free core nutation not removed*
126-134Error in dY (msec. of arc)
135-144Bull. B PM-x (sec. of arc)*
145-154Bull. B PM-x (sec. of arc)*
155-165Bull. B UT1-UTC (sec. of time)*
166-175Bull. B dX wrt IAU2000A nutation (msec. of arc)*
176-185Bull. B dY wrt IAU2000A nutation (msec. of arc)*

* Abbreviated terms:

  • Bull. — Bulletin

  • LOD — Length of day

  • wrt — With regard to

  • pm — Polar motion

Version History

Introduced in R2017b