Facilities > VLA > Data Archive > Data Shipment

Data Shipment

by Claire Chandler last modified Feb 09, 2016 by Tony Perreault
Data shipment policy

With the increase in data rate that accompanies the availability of 16 correlator sub-bands for the EVLA D-configuration, September 2011, dataset sizes will typically be several 10's of GB in size, or larger. While many NRAO users may have fast enough internet connections to continue to allow the download of datasets via FTP, others may not. NRAO is therefore now offering a data shipping service for any user who would like their data to be shipped to them on a hard disk. Typically, we expect that users with more than 100 GB of data will want to have their data shipped on disk rather than FTP, but we do not set a limit on the dataset size that users can try to FTP if they so wish. NRAO will ship data on disk to users under the following policy:

  • The disk shipping service is available for users registered through the NRAO user portal at my.nrao.edu
  • For data within the proprietary period, NRAO will cover shipping costs; the user will be responsible for the cost of media, and media will not be shipped until payment is received by NRAO.  There is no limit to the number of disks that can be shipped to an individual user by NRAO, within reason.
  • For projects that waived the usual 12 month proprietary period, or have a reduced proprietary period by reason of being a DDT proposal, NRAO will cover shipping costs to investigators associated with the project for a period not to exceed 12 months following the last observation for the project; the user will be responsible for the cost of media, and media will not be shipped until payment is received by NRAO.
  • For data that are no longer within the proprietary period, and are generally accessible to all through the Archive Access Tool, the user will be responsible for shipping, handling, and media costs; media will not be shipped until payment has been received by NRAO.
  • NRAO will provide the media, and will comprise a 2 TB disk (which effectively holds 1.8TB of data), formatted to either Linux ext3 or Mac OSX, in an enclosure with USB2.0 and eSATA cables; we will not accept user-supplied disks.
  • Multiple projects or datasets may be written to a single disk, at the request of the user.
  • Payment for disk(s) and shipping (if required): if payment is made by wire transfer there will be an additional charge and it could take longer to verify receipt of payment—up to several weeks. Once you've been invoiced by NRAO, if time is of the essence, please consider paying using a credit card.

The shipment of data via disk can be requested from the Archive Access Tool, which supports requests for data in CASA MeasurementSet, UVFITS and raw Science Data Format/Binary Format Data (SDM/BDF) formats. Please note that ongoing modifications to the SDM/BDF data formats may result in older versions of CASA and/or AIPS not being able to read these files.

The data shipping policy applies to any data available through the AAT (i.e., this service is not limited to EVLA data). Questions about disk shipment should be directed to the NRAO Helpdesk.