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A fictitious graticule based upon an oblique map projection.

Related Terms

FICTITIOUS GRATICULE

The network of lines representing fictitious parallels and fictitious meridians on a map, chart, or plotting sheet. It may be either a transverse graticule or an oblique graticule depending upon the kind of projection; a fictitious graticule may also be a GRID.

GRATICULE

1. The network of lines representing parallels and meridians on a map, chart, or plotting sheet. A fictitious graticule represents fictitious parallels and fictitious meridians. 2. A scale at the focal plane of an optical instrument to aid in the measurement of objects.

PLOTTING CHART

An outline chart on a specific scale and projection, usually showing a graticule and compass rose, designed to be used ancillary to a standard nautical chart, and produced either as an independent chart or part of a coordinated series.

POSITION PLOTTING SHEET

A blank chart, usually on the Mercator projection, showing only the graticule and a compass rose. The meridians are usually unlabeled by the publisher so that they can be appropriately labeled when the chart is used in any longitude. It is designed and intended for use in conjunction with the standard nautical chart.

TRANSVERSE GRATICULE

A fictitious graticule based upon a transverse map projection.

ISOCONCENTRATION MAP

Map or diagram of a liquid or gas system's concentration with respect to a single component of the system, shown by constant-concentration contour lines.

ISOGRIV

A line drawn on a map or chart joining points of equal grivation

CHART

A map for use by navigators.

ISOPLETH

1. An isogram indicating the variation of an element with respect to two variables, one of which is usually the time of year. The other may be time of day, altitude, or some other variable. 2. A line on a map depicting points of constant value of a variable. Examples are contours, isobars, and isogons.

ANGULAR DISTORTION

Distortion in a map projection because of non-con- formity

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