![]() ![]() The RTDC
![]() Processing SMA Data
![]() 1.2 m Telescopes
![]() AST/RO
![]() Extra
![]() |
SMA Data Reduction with MIRIADMIRIAD introduction MIRIAD (Multichannel Image Reconstruction, Image Analysis, and Display) is a command line based software package, originally developed to handle data from the Hat Creek (BIMA) telescope. It is an open source package, and at the CfA several SMA-specific tasks have been added to allow the reading, calibration, and imaging of SMA data. We recommend using MIR for calibration and MIRIAD for imaging only. If you plan to read raw SMA SWARM data into MIRIAD you will need to run it through a pre-processing script as the first step. MIRIAD has a number of problems reading SWARM data, so this step will identify any known issues with the data structure, fix them and convert the data into MIRIAD format for further processing. If this step fails you should email smamiriad@cfa.harvard.edu and a patch will be created for your data.
You can find information for users outside the CfA here. If you need full access to MIRIAD to reduce your data we recommend requesting a guest account so you can access the latest version of the software.
Rechunking data The pre-processing scripts do not reliably support SMA data that has been rechunked with SMARechunker. It may work if the data structure was unaffected but this is not always the case. MIRIAD does not have the same memory requirements as IDL, so it is possible to load full resolution SWARM data sets. Pre-processed data can then be rebinned within MIRIAD using the uvaver task.
After sourcing the relevant MIRIAD file you can run MIRIAD commands from a normal shell. You do not need to type
Sample calibration and imaging scripts Find some example reduction scripts for SMA data at the external links below:
MIRIAD links
Getting help
Email smamiriad@cfa.harvard.edu with questions.
|
CENTER FOR ASTROPHYSICS | HARVARD & SMITHSONIAN |