Mapping science

Mapping science

The systemic study of the processes and designs involved with map making.

Industry: Earth science

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Mapping science

Equinox of date

Earth science; Mapping science

One (usually the vernal equinox) of the two points on the celestial sphere in which the celestial equator intersects the ecliptic at the time of an observation. Both the celestial equator and the ...

Dynamical equinox

Earth science; Mapping science

The ascending node of the Earth's orbit; i.e., that intersection of the celestial equator with the ecliptic at which the Sun's declination is changing from south to north.

Mean equinox

Earth science; Mapping science

The average location of the equinox as affected by nutation.

The difference between the measured value of a quantity and a value adopted as representing the ideal or true value of that quantity. Errors of observation are composed of either one or both of two ...

Error

Earth science; Mapping science

(1) The difference between the measured value of a quantity and the theoretical or defined value of that quantity: ε(error) ≡ y (measured) - y (theoretical). (2) The difference between an observed ...

Exposure factor

Earth science; Mapping science

Any factor which must be taken into consideration when calculating the correct time interval for exposure. Among the important exposure factors are the relative aperture of the lens system, type of ...

Gross error

Earth science; Mapping science

(1) A very large error. The usual implication is that the error was made by a person. If this is to be made explicit, the error is termed a blunder. (2) An error which is the result of ...