VLBA Pipeline Data Products
This is the current list of VLBA pipeline outputs. These outputs may evolve, especially during this time of development and during early production.
Comparisons with the output from the VLA pipeline are in italics. VLA pipeline data products are described in NvasDataProducts.
Data files
Multi-source (per-project) files
Description |
File Descriptor |
File Type |
Calibrated visibility data |
obit.fits.vis |
AIPS FITS |
AIPS tables (without data) |
obit.fits.tab |
AIPS FITS |
Plot: Amplitude vs. time |
obit.ps.plot |
multi-page PostScript |
Plot: Phase vs. time |
obit.ps.plot |
multi-page PostScript |
Plot: Delay vs. time |
obit.ps.plot |
multi-page PostScript |
Plot: Phase & Amplitude vs. frequency |
obit.ps.plot |
multi-page PostScript |
Plot: Opacity |
obit.ps.plot |
multi-page PostScript |
Pipeline log |
obit.txt.log |
ASCII text |
Pipeline input parameters |
obit.txt.python |
Python (ASCII text) |
The VLA pipeline did not produce multi-source plots or a list of input parameters.
Single source files
Description |
File Descriptor |
File Type |
Image |
obit.fits.image |
FITS |
Image |
obit.jpg.image |
JPEG |
Image thumbnail |
obit.jpg.image |
JPEG |
Plot: Contour map |
obit.jpg.plot |
JPEG |
Plot: Amplitude vs. Baseline length |
obit.jpg.plot |
JPEG |
Plot: Real vs. Imaginary |
obit.jpg.plot |
JPEG |
Plot: u vs. v coverage |
obit.jpg.plot |
JPEG |
The VLA pipeline did not produce a contour map.
We would like to store the following metadata in a DBMS. We want this metadata available for generating query responses for end users, for routine data validation, and for occasional inspection/manipulation of the data products. The multi-source and single source metadata should be stored in separate tables, where each row is tied to row(s) in the other table using key values.
The VLA pipeline did not use a DBMS. Metadata was stored in file names and in a large ASCII table.
Col. name |
Type |
Description |
project |
string |
observation project name |
session |
string |
observation project session |
band |
string |
receiver band code |
obsDate |
date |
observation date |
procDate |
date |
pipeline processing date |
obitVer |
string |
Obit version (TBD) |
aipsVer |
string |
AIPS version |
pyVer |
string |
Python version |
sysInfo |
string |
system information on processing machine (uname -a) |
contCals |
array of strings |
continuum calibrators |
goodCal |
Python dictionary |
good-calibrator metadata |
anNames |
array of strings |
names of all antennas used |
freqCov |
2-D array of floats |
frequency coverage (low & up sideband pairs for all IFs) |
minFringeMas |
float |
minimum fringe spacing (mas) |
ssKeys |
array of keys |
keys to corresponding rows in the single source table |
Add to this list full paths and/or URLs to each of the multi-source data files.
Col. Name |
Type |
Description |
Source |
string |
Source name |
ObsDate |
date |
Observing date as "yyyy-mm-dd" |
RA |
float |
Source RA (deg) at standard equinox |
Dec |
float |
Source Dec (deg) at standard equinox |
RAPnt |
float |
Antenna pointing RA (deg) at standard equinox |
DecPnt |
float |
Antenna pointing Dec (deg) at standard equinox |
Freq |
float |
Reference frequency (Hz) |
numVis |
integer |
Number of visibilities (ignoring flagging) |
Size |
integer |
Width of image in deg (From Stokes I) |
Cells |
float |
Cell spacing in deg (From Stokes I) |
Exposure |
float |
Total integration time (day) |
for each s in Stokes: |
sSum |
float |
Sum of clean components in Jy |
sPeak |
float |
Peak pixel brightness in Jy |
sRMS |
float |
RMS noise in inner quarter (Jy) |
sBeam |
array of floats |
Beam (maj, min, PA) (deg) |
msKey |
key |
key to the corresponding row in the multi-source table |
Add to this list full paths and/or URLs to each of the single source data files.