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Knowledgebase : Archive & Data Retrieval
     
Since Cycle 2, the ALMA calibrator database is accessible at the ALMA Science Portal [1]. It provides a history of flux densities at given frequencies and angular structure information or limits for more than 700 sources. In addition, processed data...
If you are the PI of an ALMA proposal that got data, you can delegate access to these data during the proprietary period to anyone with an ALMA account (Co-I's or other ALMA users). To do this, log into the ALMA Science Portal [1] using your ALMA u...
There are occasions when users may wish to download data from the ALMA archive without a graphical user interface. Several possibilities exist. The simplest is to first use a standard web-browser (e.g. on a laptop), query the archive, select the dat...
Currently, it is only possible to download data in raw ASDM tar files or processed data tar file packages. Eventually, ALMA will also provide direct access to images, but this feature will not be available for several months. For Cycle 1 and Cycle ...
Currently, 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 ALMA QA2 Data Products [1] document. RAW DATA The raw data are written in ALMA Science ...
ALMA datasets can be very large, and take many hours to download. However, there are a couple of steps a user can take to minimize the wait: 1) Ensure you are on a good internet connection. Many commercial home internet providers will allow you to s...
The ALMA calibrator databasecan be directly queried through a web form at http://almascience.org/sc [1]. Alternatively, you can query the ALMA calibrator database from the OT in this way: - Open up the OT and create a Science Goal (or use an existi...
ALMA raw data, data products (images or cubes), and auxiliary data (scripts, logs and quality assessment figures) are stored in the archive for each data delivery. For ALMA Cycle 0, the calibrated visibilities (also called a "measurement set" or MS in ...
During Early Science, ALMA Observations are subject to "best efforts", meaning that the observatory will attempt to meet the sensitivity and resolution stated by Primary Investigators (PIs) in their Science Goals. Each project component ("Schedule Bloc...
What you see in your data package when you download it from the archive will depend on whether the imaging and calibration have been performed by the pipeline, or one or both via a manual process. Except for datasets that were put through the imaging p...
The Web Start version of the OT and Archive Download Manager require the JNLP file to be executed with javaws. If your default java client is another application (ex. IcedTea), the file will launch this application and give you the error: Fatal: Ini...
QA0 (Quality-Assurance stage 0) is a near-real-time verification of data quality performed at the time of data taking. It reflects the quality of the calibrations included in the Scheduling Block (SB) as well as other basic parameters of the observatio...
A table of ALMA Science Verification (SV) targets and observing parameters is provided at the "ALMA Data=>Science Verification" link from the ALMA Science Portal (almascience.org). A description of the SV process and policies is given at http://almasci...
Any user can get a listing of the projects or targets that were observed by ALMA on any given date with a simple query to the ALMA Data Archive, accessed from the Science Portal by following the left menu link "Data → Archive", and clicking the "Archiv...
There are a number of features and minor bugs in the ALMA archive software that can lead to difficulties downloading data: 1) Request handler fails with "Missing permissions manifest attribute in main jar" (when using versions of Java 7 Update 51 and l...
Cycle 0 data was processed by ALMA science staff using CASA, with scripts that reflect the best practices in ALMA data reduction. However, improvements and bug fixes to CASA are made over time, and users may wish to reprocess their data with a more rec...
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