1. VIE_INIT_V30
Daniel Landskron

2. VIE_INIT
VIE_INIT
8th VieVS User Workshop

3. i.e. guiparameter.mat, process_list.mat, runp.mat
VIE_INIT
scan
antenna
sources
Superstation
file
GUI settings
i.e. guiparameter.mat, process_list.mat, runp.mat
Outlier file
(e.g. 15APR01XE_N004.OUT)
Supersource
NGS files
or VGOS_DB files or
VSO files
OPT file
(e.g. 15APR01XE.OPT)
parameter
8th VieVS User Workshop

4. VIE_INIT Reads basic files Sets exceptions Reads observations from
NGS file
vgosDB file
VSO file
Reads station coordinates and velocities from the superstations file
Reads source coordinates from supersource file
Sets exceptions
Removes outliers (specified in an outlier file)
Excludes stations, sources, baselines (specified in OPT-file)
Introduces an elevation cut-off angle
afternoon session!
8th VieVS User Workshop

5. VIE_INIT options File > Set input files DATA/NGS/ DATA/OPT/
Choose the sessions
you want to analyze
DATA/NGS/
Choose directory with OPT-files
DATA/OPT/
Choose directory with outliers
Eliminate outliers or not
(check box)
DATA/OUTLIER/
8th VieVS User Workshop

6. VIE_INIT options Parameters > Reference frames Select what TRF
file to use:
itrf2005
Itrf2008
itrf2014
vtrf2008
vtrf2014
ivsTrf2014b
VieTRF2013
vievsTrf
8th VieVS User Workshop

7. VIE_INIT options Parameters > Reference frames Select what CRF
file to use:
vievsCrf
GSFC2015b
icrf2
icrf2nonVCS
icrf1Ext2
VieCRF10a
8th VieVS User Workshop

8. VIE_INIT options Parameters > Observation Restrictions
Quality code limit:
Only observations with a quality flag less or equal to this limit are used
Higher quality code → worse quality of observation
Quality code 0: good quality
Quality code >0: bad quality
Normally use quality code limit 0
8th VieVS User Workshop

9. VIE_INIT options Parameters > Observation Restrictions
Cut-off elevation angle
8th VieVS User Workshop

10. GUI Settings Created by GUI (VIE_SETUP)
WORK/
DATA/LEVEL0/
Created by GUI (VIE_SETUP)
guiparameter.mat
process_list.mat
runp.mat
Contain the options for VIE_INIT
(and the other parts of VieVS)
The parameter file guiparameter.mat is stored in WORK/ and copied to DATA/LEVEL0/ directory
8th VieVS User Workshop

11. VIE_INIT scan antenna sources Superstation file GUI settings
Outlier file
(e.g. 15APR01XE_N004.OUT)
Supersource
OPT file
(e.g. 15APR01XE.OPT)
parameter
NGS files
or VGOS_DB files or
VSO files
8th VieVS User Workshop

12. NGS file DATA/NGS/ Analysis Center Analysis Center Correlator
with Calc/Solve
Ionospheric correction &
Delay ambiguity resolution
Analysis Center
with VieVS
Database
Ver. 2
Database
Ver. 3
MK3NGS2
Database
Ver. 1
Database
Ver. 4
NGS
Results
e.g. SINEX
IVS DATA CENTER
8th VieVS User Workshop

13. NGS file An NGS file (version > 3 or 4) contains:
DATA/NGS/
An NGS file (version > 3 or 4) contains:
Observed arrival delay (and delay rate)
Ionospheric delay (and rate)
Additional measurements, e.g. temperature, pressure
Cable wrap, quality code
Ambiguities already resolved
8th VieVS User Workshop

14. NGS file example Baseline Source Time Delay Formal error Cable
DATA IN NGS FORMAT FROM DATABASE 14JUN17XA_V004
Observed delays and rates in card #2, modified errors in card #9
NYALES AZEL
WETTZELL AZEL
...
$END OJ
D GR PH
NYALES20 WETTZELL OJ I I
HOBART12 TSUKUB I
Baseline
Source
Time
Delay
Formal error
Quality code (0=good)
Cable
Temperature, pressure, humidity
Ionospheric delay and formal error
8th VieVS User Workshop

15. TRF files Superstation file (superstation.mat)
Can be created/updated using the GUI
Contains station coordinates, velocities, and additional antenna info (mount, axis offset, eccentricity, etc.)
itrf2005, itrf2008, vtrf2008, vievsTrf, …
If a station is not found in the chosen TRF, the coordinates from vievsTrf are used
afternoon session!
8th VieVS User Workshop

16. CRF files Supersource file (supersource.mat)
Can be created/updated using the GUI
Contains source coordinates
icrf2, icrf2nonVCS, icrf1Ext2, VieCRF10a, vievsCrf, …
If a source is not found in the chosen catalogue, the vievsCrf coordinates are used
afternoon session!
8th VieVS User Workshop

17. OPT file
DATA/OPT/
Contains information of clock breaks (not used in VIE_INIT), stations to be excluded, sources to be excluded etc.
See separate presentation
afternoon session!
8th VieVS User Workshop

18. Outlier file Contains list of outliers for the session
DATA/OUTLIER/
Contains list of outliers for the session
Created in VIE_LSM
Outliers are removed in VIE_INIT
To detect and remove outliers you need to run VieVS twice:
In the first run, outliers are detected in VIE_LSM and saved in an outlier file (if specified!)
In the second run, this file run is used in VIE_INIT for removing the outliers
8th VieVS User Workshop

19. Processing example
VIE_INIT
Push!
8th VieVS User Workshop

20. Processing example Input file format and name of the file
Excluded or down-weighted according to OPT file
Numbers of
stations, sources and scans
Names of the stations
8th VieVS User Workshop

21. Output of VIE_INIT VIE_INIT
Matlab structure arrays: scan, antenna, sources and parameters
Saved in DATA/LEVEL0/
File names: NGSFILENAME_output.mat
VIE_INIT
scan
16JAN04XA_N004_antenna.mat
antenna
sources
16JAN04XA_N004_parameter.mat
parameter
16JAN04XA_N004_scan.mat
16JAN04XA_N004_source.mat
For detailed description, see VieVS Wiki: “Important files”
8th VieVS User Workshop

22. The scan structure array
Contains information about all usable scans
Observed delays (and sigmas), corrected for ionosphere and cable wrap (scan.obs.obs)
All observations in the NGS file with quality code below or equal to the limit, above minimum elevation angle, not in list of outliers, stations not excluded etc.
Also contains additional measurements, like pressure, temperature and humidity
More quantities added in VIE_MOD
For detailed description, see VieVS Wiki: “Important files”
8th VieVS User Workshop

23. The antenna structure array
Contains information about all stations which participate in at least one scan in the scan structure array
Station positions and velocities
Additional information, e.g. antenna mount, eccentricities, axis offset
For detailed description, see VieVS Wiki: “Important files”
8th VieVS User Workshop

24. The sources structure array
Contains information about all sources which were observed in at least one scan in the scan structure array
Contains the source positions
For detailed description, see VieVS Wiki: “Important files”
8th VieVS User Workshop

25. Things that are good to know
If pressure and temperature for station n are missing in the NGS file, they will be calculated from GPT3 (Global Pressure and Temperature model 3)
If station/source n is not in the TRF/CRF, the field “antenna(n).in_trf/sources(n).in_crf “ will be zero (otherwise one)
For detailed description, see VieVS Wiki: “Important files”
8th VieVS User Workshop

26. Thank you! Next: VIE_MOD
8th VieVS User Workshop