| Alert | A signal (e.g. XML-formatted RSS feed) to the astronomical research community that something has changed at a given location on the sky: either the brightness or position of an object, or the serendipitous appearance of some totally new object.
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| algorithm | a class that implements some method of processing.
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| Association Pipeline | An application that matches detected Sources or DIASources or generated Objects to an existing catalog of Objects, producing a (possibly many-to-many) set of associations and a list of unassociated inputs. Association Pipelines are used in the Nightly Alert processing after DIASource generation and in the final stages of Data Release processing to ensure continuity of Object identifiers.
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| (Astronomical) Object | A star, galaxy, asteroid, or other physical object of astronomical interest. Beware: in non-LSST usage, these are often known as sources.
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| Base Camp | ...
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| Calibrated Science Image | A raw image that has been processed through the ISR Pipeline and has had its background and PSFs estimated.
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| Calibration Image | Any of a set of images used in the ISR Pipeline to remove distortions caused by the telescope, detector, or other sources. Includes darks, flats, tunable-laser dome flats, etc.
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| Camera Crosstalk-Corrected (C3) Image | An image from the Camera system that has had crosstalk removed but has not been processed by the ISR Pipeline. Beware: this is not the same as a raw image (which has not had crosstalk removed).
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| Data Release processing | The processing that occurs periodically at the Archive Center to generate a Data Release, including Instrument Signature Removal, Deep Detection, Multifit Source Measurement, Photometric Calibration, Astrometric Calibration, Difference Template Generation, Co-Add Generation, Difference Image Analysis, and at least one version of Association. This is distinct from the Nightly Archive processing that also occurs at the Archive Center that includes some of the same steps.
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| difference image | ...
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| difference image source | ...
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| Image Processing Pipeline | ...
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| Instrument Signature Removal (ISR) Pipeline | An application that removes telescope, detector, and other distortions from a raw image.
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| Moving object | ...
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| Nightly Alert processing | The processing that occurs at the Base Camp in near-realtime. Produces and analyzes difference images in order to generate Alerts.
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| Nightly Archive processing | The processing that occurs at the Archive Center on a daily basis. This includes a duplicate of the Nightly Alert processing, but it may also include additional processing to update the Unreleased Catalog and the image caches.
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| Object | See Astronomical Object. Beware: in computing, "object" refers to an instance of a class (a data structure with methods) that may represent anything, including an Object, a Source, or an Exposure.
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| pipeline | a configured sequence of Stages. Example: Association Pipeline.
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| policy | ...
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| Point Spread Function (PSF) | The function that maps a photon-emitting point in space to its resulting image as seen by the detector.
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| production | overarching set of coordinated Pipelines and Sub-Productions. Example: Data Release Production.
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| Raw Image | The image of the sky as received from the detector, with crosstalk present.
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| slice | ...
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| Source | A detection of an Object in a particular Exposure. Beware: in non-LSST usage, these are often known as detections, while "source" is used for what LSST calls an Object.
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| SDQA Metric | The name of a quantity that is calculated for image data by SDQA-related pipeline processes (e.g., mean, standard deviation, number of saturated pixels, mean PSF width, etc.). Associated with the metric name are the physical units of the calculated quantity and whether the quantity's data type is integer or floating-point.
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| SDQA Rating | The value and error associated with an SDQA metric. An image can have a set of different SDQA ratings.
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| SDQA Status | The status assigned to an image by the SDQA subsystem (e.g., pass, fail, unknown, etc.). Database tables that store image metadata will include a field containing an ID number that corresponds to an SDQA status.
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| SDQA Threshold | The set of lower and upper thresholds associated with an SDQA Metric. Some metrics have only either a lower or upper threshold. In general, the thresholds depend on observing conditions (e.g., atmospheric seeing, filter, etc.).
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| source classification | ..
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| stage | wraps an algorithm into an API which is pluggable into a pipeline which may support serial and/or parallel processing.
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| sub-production | set of coordinated pipelines i.e. larger than a single pipeline. Example: Astrometry Sub-Production
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| subsystem | a defined combination of hardware, a software stack, a set of running processes, and the people who manage them. It refers to a major component of the DM System operations, i.e. "Archive Operations Subsystem", "Data Processing Subsystem".
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| template table | A database table that contains no data, and is used to create short-lived tables using syntax "CREATE TABLE x LIKE y"
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| xrootd | Server for low latency high bandwidth data access, see xrootd for more details.
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| ADQL | Astronomical Data Query Language
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| AP | Association Pipeline
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| CM | Configuration Management
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| CTIO | Cerro Tololo Inter-American Observatory
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| DAF | Data Access Framework
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| DBMS | Database Management System
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| DES | Dark Energy Survey
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| DFS | Distributed File System
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| DIASource | Difference Image Source
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| DLS | Deep Lens Survey
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| DP | Detection Pipeline
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| DPS | Distributed Processing Services
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| DR | Data Release
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| DWDM | Dense Wavelength Division Multiplexing
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| GFS | Google File System
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| IPAC | Infrared Processing and Analysis Center
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| JHU | Johns Hopkins University
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| MOPS | Moving Object Processing System
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| NCSA | National Center for Supercomputing Applications
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| NOAO | National Optical Astronomy Observatory
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| OCS | Online Control System
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| PanSTARRS | Panoramic Survey Telescope & Rapid Response System
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| REN | Research and Educational Networking
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| SQA | Software Quality Assurance
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| SDP | Software Development Process
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| SDQA | Science Data Quality Analysis
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| SDSS | Sloan Digital Sky Server
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| SLAC | SLAC National Accelerator Laboratory, formerly known as Stanford Linear Accelerator Center
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| V&V | Verification and Validation
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| VO | Virtual Observatory
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