The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image ≈14,000 deg 2 of the extragalactic sky visible from the northern hemisphere in three optical bands (g, r, and z) using telescopes at the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory. The combined survey footprint is split into two contiguous areas by the Galactic plane. The optical imaging is conducted using a unique strategy of dynamically adjusting the exposure times and pointing selection during observing that results in a survey of nearly uniform depth. In addition to calibrated images, the project is delivering a catalog, constructed by using a probabilistic inference-based approach to estimate source shapes and brightnesses. The catalog includes photometry from the grz optical bands and from four mid-infrared bands (at 3.4, 4.6, 12, and 22 μm) observed by the Wide-field Infrared Survey Explorer satellite during its full operational lifetime. The project plans two public data releases each year. All the software used to generate the catalogs is also released with the data. This paper provides an overview of the Legacy Surveys project.

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This paper presents a paradigm, called ShapeShifting TV, for the realisation of interactive TV narratives or, more generally, of interactive screen-media narratives. These are productions whose narrations respond on the fly (i.e. in real time) to interaction from active viewers. ShapeShifting TV refers to productions made mainly with prerecorded time-based material, in which variation is achieved by selecting and rearranging atomic elements of content (e.g. video clips) into individual narrations. The aimed quality of the productions (e.g. narrative continuity and aesthetics) is at least that of good traditional linear TV programmes.The artefact which determines the way individual stories unfold, called the narrative space, is authored and tested by experts before the delivery of the programme. However, the adaptation of narrations to input, at delivery time, is automatic. ShapeShifting TV is a generic paradigm; it is neither production nor genre specific. Furthermore, it is not confined to television; it is about screen media in general. ShapeShifting TV is founded on a computational language called Narrative Structure Language (NSL) and is accompanied by a comprehensive software system for authoring and delivery (which implements NSL). These were successfully employed to the creation of a number of ShapeShifting TV productions, which extended genres such as drama, documentary and news with interactivity. This paper defines the ShapeShifting TV paradigm, outlines NSL and the associated software, and presents two ShapeShifting TV productions.

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