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Processing (Calibrating and Imaging)
SMA Data
Processing Software: MIR, MIRIAD, and AIPS
The raw data in the SMA data directories, i.e., correlator output, are in MIR format, but can be converted to MIRIAD or FITS (for AIPS) formats, if desired.
- Processing with MIR
- Pros: No format translation necessary. Well tested.
- Cons: No imaging. Memory intensive.
Details of data processing using MIR can be found in The MIR Cookbook.
Note: By typing "idl", you will access 32-bit idl on 32-bit machines and 64-bit idl on 64-bit machines.
- Processing with MIRIAD
- Pros: Calibration and imaging in same package.
- Cons: Format translation necessary. Less well tested.
Details of data processing using MIRIAD can be found in the MIRIAD Users' Manual.
- Processing with AIPS
- Pros: Exceedingly well tested (it has been around since the late 70's).
- Cons: Translation and preliminary processing necessary.
Details of data processing using AIPS can be found in The AIPS Cookbook.
Note: To do preliminary processing and convert data to FITS format, consult The MIR Cookbook, above.
Obtaining the Raw Data:
If you do not have an account on the CfA's R&G computers:
- Click here for data search and request (or download) instructions.
- Install the MIR and MIRIAD software package on your home machine and process from there.
If you do have an account on the CfA's R&G computers:
- Retrieve the data files from the appropriate area (see table below). If you are not the PI, please limit your access to data outside the proprietary period (>15 months).
- Process the data locally, using either MIR or MIRIAD.
Data Location (on the R&G computers):
| Data Year |
Location |
| 2003-2005 |
/pre_2006/science/mir_data |
| 2006-2008 |
/2006_2008/science/mir_data |
| 2009 |
/2009/science/mir_data |
| 2010 |
/2010/science/mir_data |
| 2011 |
/2011/science/mir_data |
| 2012 |
/2012/science/mir_data |
Notes:
- The R&G computers available for SMA data processing are: RTDC2-7.
- Prior to May 2007, testing data (baseline, engineering, flux, pointing, and priming) were mixed in with the science data. They are now directed to their own areas, i.e.,
/2006/baseline/mir_data,
/2006/engineering/mir_data,
/2006/flux/mir_data,
/2006/pointing/mir_data,
/2006/priming/mir_data
Testing data are also subject to the 15 month proprietary period.
- Large data sets (> 4.3 GB) must be processed on a 64-bit machine (RTDC2-4,6-7). Small data sets (< 4.3 GB) can be processed on any machine.
- Please do not use your home directory for analyzing large data sets. Ask for a temporary work area, if you need one.
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