English

White or yellowish light which spreads out, in the night sky, more or less along the ZODIAC from the HORIZON on the side on which the SUN is hid­den. It is observed when the sky is sufficient­ly dark and the ATMOSPHERE sufficiently clear.

An area in all parts of which the same TIME is kept. In general, each zone is 15° of LONGITUDE in width, with the GREENWICH MERIDIAN (0° LONGITUDE) designated as the central MERIDIAN of zone 0 and the remaining zones centered on a MERIDIAN whose LONGITUDE is exactly divis­ible by 15°. Zones are used in connec­tion with ZONE, STANDARD, and DAYLIGHT SAVING TIMES. Also calledtime zone.

That region in space within which the difference in AMPLITUDE of two radio signals (usually emitted by a single STATION) is indistinguishable.

A method of enlarging graphics on a graphical display, usually a function provided by the hardware of the screen. Either a selected WINDOW may be enlarged to cover the entire screen or by repeatedly pressing a key, a stepwise or continuous enlargement of the screen contents can be invoked, keeping the graphics centered at the screen's centre.

In ECDIS, a characteristic of an OBJECT, usually of a charted feature. It is implemented by a defined ATTRIBUTE LABEL/CODE, acronym, definition and applicable values. In the DATA STRUCTURE, the attribute is defined by its LABEL/CODE. Attributes are either qualitative or quantitative.

In ECDIS, the S-57 conforming data at the data producer’s site that does not contain any UPDATE RECORDS. Once this data is exchanged, it becomes TARGET DATA at the APPLIER’s site.

In ECDIS, the data structure in which the geometry is described in terms of EDGES, ISOLATED NODES and CONNECTED NODES. Edges and connected nodes are topologically linked. NODES are explicitly coded in the DATA STRUCTURE.