Concat Improvements

CASA Modification Request 31C108, November 2007



1. Introduction

Concat is the task to combine two measurement sets into one measurement set. It has several minor problems which are outlined here.

2. Background

3. Requirements

Combining different measurement sets are needed since many projects parts will be observed at different times or configurations (egs VLA configurations). The suggested improvments are:

1. It is awkward to have concat add the second measurement set to the end of the first measurement set. If something goes incorrectly with concat, then the first measurement set is often changed sufficiently that is must be generated again. With luck it has been backed up. Therefore, concat should read in the two data sets and produce a third data set which is the concatenated one.

2. concat is a little sloppy in concatenating two data sets with a different set of data columns. See [https://bugs.aoc.nrao.edu/browse/CAS-434][JIRA Ticket CAS-434]]. There are still some inconsistencies in CASA about whether a measurement set has one data column or three data columns (data, model, corrected), and concat is one task that can be confused. Also, it had not been well tested for concatenation of data sets with differing spectral and polarization properties.

4. Design

5. Deployment Checklist

6. Test Plan

6.1 Internal Testing

6.2 Sponsor Testing

6.3 Integration/Regression Tests

6.4 Testing for Scientific Validity


Signatures

APPROVED: I acknowledge that my request is fully contained in this MR, and if the CASA development group delivers exactly what I specified, I will be happy.

ACCEPTED: I acknowledge that I have validated the completed code according to the acceptance tests, and I am happy with the results.

Written - - - - -
Checked - - - - -
Approved by Scientific Sponsor - - - - -
Accepted/Delivered by Sponsor - - - - -

Symbols:
  • Use %X% if MR is not complete (will display ALERT!)
  • Use %Y% if MR iscomplete (will display DONE)


Discussion Area

-- NicoleRadziwill - 30 Oct 2007

-- EdFomalont - 23 Nov 2007
Topic revision: r1 - 2007-11-23, EdFomalont
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