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Obtaining & Processing SMA Data
Obtaining Data
- If you do not have an account on the CfA's R&G computers:
- Make a request through the Searchable Data List. Data will be copied to an anonymous ftp area and you will be sent an e-mail detailing retrieval methods.
- 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 do not access data within the proprietary period (<15 months).
- Process the data locally, using either MIR or MIRIAD
Data Location (on the R&G computers):
| Pre-2006 Data |
2006-2008 Data |
2009+ Data |
| /pre_2006/science/mir_data |
/2006/science/mir_data |
/2009/science/mir_data |
Notes:
- The R&G computers available for SMA data processing are: RGLINUX5-9 and RTDC1-4.
- 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
- Large data sets (> 4.3 GB) must be processed on a 64-bit machine (RGLINUX6-9 or RTDC2-4).
- Small data sets (< 4.3 GB) can be processed on these machines or on RGLINUX5 or RTDC1.
- Please do not use your home directory for analyzing large data sets. Ask for a temporary work area, if you need one.
Processing with MIR, MIRIAD, or AIPS
The data in the SMA data directories, i.e., written by the correlator, 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: Loading of large data sets can be slow.
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: Fast.
- 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.
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