aeroReadIERSData
File containing current International Astronomical Union (IAU) 2000A Earth orientation data
Description
creates a MAT file, file
= aeroReadIERSData(foldername
)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
creates the MAT file based on Earth orientation data from a specific web site or
data file.file
= aeroReadIERSData(foldername
,'url',urladdress
)
Examples
Create File from IERS Data
This example shows how to create the Earth orientation file for the current day or a specified website.
Create File from Specified Website
Create the Earth orientation file for the current day, in the current folder, using data from the default https://maia.usno.navy.mil/ser7/finals2000A.data
website.
aeroReadIERSData(pwd)
ans = '/tmp/Bdoc24b_2679053_4032461/tp5c11b0aa/aero-ex20368314/aeroiersdata20240720.mat'
Create File from Specified Website
Create the Earth orientation file for the current day, in the current folder, using data from the alternate https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt
website.
aeroReadIERSData(pwd,'url','https://datacenter.iers.org/data/latestVersion/10_FINALS.DATA_IAU2000_V2013_0110.txt')
ans = '/tmp/Bdoc24b_2679053_4032461/tp5c11b0aa/aero-ex20368314/aeroiersdata20240720.mat'
Create File from Specified File
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
foldername
— Folder for IERS data file
folder name
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
'url',urladdress
— Optional web site or Earth orientation data file
https://maia.usno.navy.mil/ser7/finals2000A.data
(default) | web site address | file name
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
file
— Location of Earth orientation data MAT file
character array
Location of Earth orientation data MAT file, specified as a character array.
More About
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
:
Column | Description |
---|---|
1 to 2 | Year (to get true calendar year, add 1900 for MJD<=51543 or add 2000 for MJD>=51544) |
3 to 4 | Month number |
5 to 6 | Day of month |
7 | Blank |
8 to 15 | Fractional modified Julian date (MJD UTC) |
16 | Blank |
17 | IERS (I) or Prediction (P) flag for Bull. A polar motion values* |
18 | Blank |
19 to 27 | Bull. A PM-x (sec. of arc)* |
28-36 | Error in PM-x (sec. of arc)* |
37 | Blank |
38-46 | Bull. A PM-y (sec. of arc)* |
47-55 | Error in PM-y (sec. of arc)* |
56-57 | Blank |
58 | IERS (I) or Prediction (P) flag for Bulletin A UT1-UTC values* |
59-68 | Bull. A UT1-UTC (sec. of time)* |
69-78 | Error in UT1-UTC (sec. of time)* |
79 | Blank |
80-86 | Bull. A LOD (msec. of time) -- not always filled* |
87-93 | Error in LOD (msec. of time) -- not always filled* |
94-95 | Blank |
96 | IERS (I) or Prediction (P) flag for Bull. A nutation values* |
97 | Blank |
98-106 | Bull. A dX wrt IAU2000A nutation (msec. of arc), free core nutation not removed* |
107-115 | Error in dX (msec. of arc) |
116 | Blank |
117-125 | Bull. A dY wrt IAU2000A nutation (msec. of arc), free core nutation not removed* |
126-134 | Error in dY (msec. of arc) |
135-144 | Bull. B PM-x (sec. of arc)* |
145-154 | Bull. B PM-x (sec. of arc)* |
155-165 | Bull. B UT1-UTC (sec. of time)* |
166-175 | Bull. B dX wrt IAU2000A nutation (msec. of arc)* |
176-185 | Bull. 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
See Also
dcmeci2ecef
| deltaUT1
| lla2eci
| eci2lla
| eci2aer
| mjuliandate
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