The Program NCOPY

Contents

• Contents
• General
• NCOPY options and keywords
• Possible later extensions

General

NCOPY is a program to selectively copy data from an input to an output SCN file. Its basic use is to condense SCN files by

• selecting only those sectors, scans and polarisations that one wants to retain;
• eliminating "holes" in a file that are no longer used.

NCOPY options and keywords

• OVERVIEW: Produce on terminal and in the log file a listing of all sectors in a file. In addition to the layout (as for NFLAG SHOW) and file size, the following is shown for each sector: g.o.f.c.s and absolute sector numbers; field name and WSRT observation number; frequency and bandwidth; hour-range and number of scans; numbers of interferometers and polarisations; technical information for testing/debugging purposes (subject to change).

  The information relevant to the user is crammed into the width of a terminal window.

• COPY: Copy sectors. The following additional information is requested once for every time the COPY option is selected:

  INPUT_SCAN
  OUTPUT_SCAN
  INPUT_SECTORS
  HA_RANGE
  POLARISATION
  Data will be appended to the output file. If the latter does not exist, a new file is created and its creation reported.

  A new output group is created for every input group, the remaining indices, o.f.c.s, being taken from the input.

Possible later extensions

As future options, to be realised only upon user demand, we consider:

• integration of data over hour-angle intervals;
• selection of interferometers;
• definition of output sector numbers by the user and (partial) correction of the deficiencies noted above;

• permanent application of corrections to the stored data as foreseen in the original Newstar design.

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