How are ALMA data products packaged?
Posted by Anand Crossley, Last modified by Rein Warmels on 16 March 2017 01:33 PM
Both raw data and processed data are ingested into the archive as tar files.
A more detailed description of the data products can be found in the document ALMA QA2 Data Products that can be found on the Documents page in the Science Portal.
The raw data are written in ALMA Science Data Model (ASDM) format with file names
Processed data sets include:
The processed data have file names
<PROJECT CODE>_<OUS UID>_<X>_of_<Y>.tar
A CASA measurement set of calibrated visibilities can be created using the scripts contained in the processed data set by following the instructions outlined in this KB article: How do I obtain a file of calibrated visibilities ("measurement set") for ALMA data?
In Cycle 0, raw and processed data were ingested within the same tar file (some early deliveries to PIs in Cycle 1 were also made this way, but are not retrievable from the archive). These tar files contained processed products 1-5 listed above, plus:
<PROJECT CODE>_<DATA DELIVERY DATE>_<X>_of_<Y>.tar
As a consequence of including the raw and calibrated measurement sets, these older tar files are much larger than the processed data files currently ingested. The raw ASDM was not included in these older files but can still be obtained by submitting a query to the ALMA Helpdesk.