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# CONCURRENT LINE

 A line on a map or chart passing through places having the same current hour

## Related Terms

### COTIDAL LINE

A line on a map or chart passing through places having the same cotidal hour

### ISOGRIV

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

### STANDARD PARALLEL

1. A parallel of latitude which is used as a control line in the computation of a map projection. 2. A parallel of latitude on a map or chart along which the scale is as stated for that map or chart.

### AREAL FEATURE

A topographic feature, such as sand, swamp, vegetation, etc., which extends over an area. It is represented on the published map or chart by a solid or screened color, by a prepared pattern of symbols, or by a delimiting line

### GREAT CIRCLE CHART

A chart on which a great circle appears as a straight line or approximately so, particularly a chart on the gnomonic map projection.

### GRID

1. A series of lines, usually straight and parallel, superimposed on a chart or plotting sheet to serve as a directional reference for navigation. 2. Two sets of mutually perpendicular lines dividing a map or chart into squares or rectangles to permit location of any point by a system of rectangular coordinates. Also called REFERENCE GRID.

### CHART SCALE

The ratio between a distance on a chart and the corresponding distance represented as a ratio such as 1:80,000 (natural scale), or 30 miles to an inch (numerical scale). May be called MAP SCALE when applied to any map.

### SYNOPTIC CHART

In meteorology, any chart or map on which data and analyses are presented that describe the state of the atmosphere over a large area at a given moment of time. A synoptic surface chart is an analyzed synoptic chart of surface weather observations.

### REPRESENTATIVE FRACTION

The scale of a map or chart expressed as a fraction or ratio that relates unit distance on the map to distance measured in the same unit on the ground. Also called NATURAL SCALE, FRACTIONAL SCALE.

### TRANSVERSE RHUMB LINE

A line making the same oblique angle with all fictitious meridians of a transverse Mercator map projection. Trans- verse parallels and meridians may be considered special cases of the transverse rhumb line. Also called INVERSE RHUMB LINE.

### Related questions

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