20 Terms
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Mapping science
The systemic study of the processes and designs involved with map making.
Industry: Earth science
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Mapping science
D layer
Earth science; Mapping science
The lowest layer of the ionosphere, at a distance of 70 - 80 km above the Earth's surface. It exists only during the daytime.
Ecliptic coordinate system
Earth science; Mapping science
(1) A right-handed, rectangular Cartesian coordinate system which has the z-axis perpen-dicular to the plane of the Earth's orbit and the x axis parallel to the line of intersection of the plane of ...
Continent
Earth science; Mapping science
(1) A large mass of land rising abruptly from the bottom of the oceanic deep and including marginal regions that are shallowly submerged. (2) One of the land masses identified as continents and ...
Covariance matrix
Earth science; Mapping science
A matrix whose element in row i and column j is the average value of (x i - μ I )(x j - μj), where x i and x j are random variables with average values μ i and μ j , respectively. The ...
Astro-geodetic coordinate system
Earth science; Mapping science
A coordinate system which has its origin at a point with known geodetic coordinates and its axes oriented with respect to astronomic north and the astronomic meridian of Greenwich. This is ...
Charted depth
Earth science; Mapping science
The vertical distance, in the direction of gravity, as determined by echo sounding, from the tidal datum to the sea bottom, using an assumed speed of sound of 800 fathoms (4800 feet) per second and ...
