Converting Arecibo Data Into CLASS Internal Format

This is a program to convert Arecibo data into CLASS internal format files. Befor running it you need to know the following:

• Where is your data located (i.e. at /share/olcor/... or /proj/a9999/...)
• What was the system temperature for both channel A & B ? (This is only used for the data headers).
• Whether the reciever was set to linear or circular polarization
• The total number of scans/cycle (i.e. it's four if you took: ON, OFF, CAL ON, CAL OFF)

Once you feel confident you know these things, login to an Arecibo computer and then go to whatever directory you wish your CLASS files to reside in. Type cltest to run the conversion program. It will ask a few questions and then start converting your data.

Note that you can also run this program "on-the-fly" to contunously update a datafile with the online data via: cltest -c

In that case, when you are finished you must quit out of the conversion program by typing ^C (possibly a few times). Make sure that there is space on the disk where you are writing the data. If the raw data disk fills up, you will lose your data.

You can specify the file names on the command line too:

cltest -c -A /share/olcor/corfile -F <output_file> -L 30 -R 28 -P c

where:

• "/share/olcor/corfile" is the name of the online datafile
• <output_file> is the name of the class file to which the data is being output. This file must have an extension (.something) for class to be able to see it (CLASS assumes any file with no . is .bur).
• "30" is the system temperature of the "A" channel (used in the data header)
• "28" is the system temperature of the "B" channel (used in the data header)
• "c" indicates circular polarization (the choices are "c" or "l")

(The other available options can be found via typing "cltest -h")

EXAMPLE

A data file with only two observations, each of a different galaxy (UGC 3489 and UGC 4131).
Each cycle consisted of ON, OFF, CAL ON, CAL OFF

/home/nolan/src2/fi/cltest -c
Enter Input (AO) filename: /proj/a9999/corfile.01jan00.a9999.1
Enter Output File: 01Jan00a.cls

Channel A system temp? :30

Channel B system temp? :28

Linear or Circular inputs? :C

Total number of scans in a cycle:4

Scan 103700038, UTC=2001-02-06T08:45:01, AST=2001-02-06T04:45:01
Object: U5440
Scan 103700038: U5440-1.  RA 10:05:36.20 Dec +04:16:23.0
Scan 103700039: U5440-2.  Offset 5400.000000 (5400.215304)
Scan 103700040: U5440-3.  Offset 5400.000000 (5400.215304)
Scan 103700041: U5440-4.  Offset 5400.000000 (5400.215304)
Scan 103700090, UTC=2001-02-06T10:01:49, AST=2001-02-06T06:01:49
Object: U5790
Scan 103700090: U5790-1.  RA 10:39:04.70 Dec +04:38:51.0
Scan 103700091: U5790-2.  Offset 5400.000000 (5400.264480)
Scan 103700092: U5790-3.  Offset 5400.000000 (5400.264480)
Scan 103700093: U5790-4.  Offset 5400.000000 (5400.264480)
Scan 103700094, UTC=2001-02-06T10:13:53, AST=2001-02-06T06:13:53
Object: U5790
Scan 103700094: U5790-1.  RA 10:39:04.70 Dec +04:38:51.0
.
.
.

CLASS_WRITER: scan 103700038 written.
CLASS_WRITER: scan 103700039 written.

Commands are (all caps required):
  QUIT to stop converting,
  DRIVE to finish entire file with same object name,
  UNTIL <scan>  to continue for num or until reaching scan,
  SKIP  <num> to skip to scan <num>,
  ASKFREQ to prompt for frequencies each time,
  ASKMAP to prompt for map pos.
  ASK to ask basic questions again.(cr will keep U3489): U3489
Scan 930900009: U3489-1.  RA 11:12:24.40 Dec +31:24:41.0
Scan 930900010: U3489-2.  Offset 5400.000000 (5400.165333)
Scan 930900011: U3489-3.  Offset 5400.000000 (5399.659220)
Scan 930900012: U3489-4.  Offset 5400.000000 (5399.719945)
Object:U4131
Number of scans in an image:4
Number of dumps in a scan:300

Commands are (all caps required):
  QUIT to stop converting,
  DRIVE to finish entire file with same object name,
  UNTIL <scan>  to continue for num or until reaching scan,
  SKIP  <num> to skip to scan <num>,
  ASKFREQ to prompt for frequencies each time,
  ASKMAP to prompt for map pos.
  ASK to ask basic questions again.(cr will keep U4131): U4131
Scan 930900009: U4131-1.  RA 07:59:11.43 Dec +31:48:23.6
Scan 930900010: U4131-2.  Offset 5400.000000 (5400.165333)
Scan 930900011: U4131-3.  Offset 5400.000000 (5399.659220)
Scan 930900012: U4131-4.  Offset 5400.000000 (5399.719945)
9632 records translated