Opening a Window of Discovery on the Dynamic Universe

Data Products

The LSST data products are organized into two groups, distinguished by the frequency with which they are generated. Level One products are generated by pipeline processing the stream of data from the camera system during normal observing, and are therefore being continuously generated and updated every observing night. This process requires a high degree of automation. 

Level One data products are divided into images, catalogs, and alerts.

Level Two products, including calibration images, co-added images (creating by stacking paired exposures), and the resulting catalogs, are generated much less often, and their release will be driven by data quality assessments. Although many of the steps that generate Level Two products will be automated, they need not all be so, with options available for some hands-on involvement in processing.

The data management system must:

1) Process the incoming stream of images generated by the camera system during observing to generate and archive the nightly data products:

  • Raw science images
  • Catalog of variable sources
  • Transient alerts.

2) Periodically process accumulated nightly data products to:

  • Generate co-added images of several types
  • Optimally measure the properties of fainter objects
  • Perform astrometric and photometric calibration of the full survey object catalog
  • Classify objects based on both their static properties and time-dependent behavior.
Image Credit: 
LSST Project Office

Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC). 

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