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Mr. Matthew Austin

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Cassini's map projection

Posted By Mr. Matthew Austin 05-20-2026 09:16 AM
Found In : Glossary
The meridional (transverse) form of the Plate Carrée map projection. It plots to scale, in a rectangular Cartesian coordinate system: (a) the geodetic distance on the rotational ellipsoid, from the central meridian to a specified point, as the x coordinate; and (b) the distance along the central ...

stream gage

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
A graduated staff placed vertically on the bed of a stream or river to measure changes in the height of the surface, or to measure the height above a specified surface. Also called a river gage.

slope chaining

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
Measuring distance along a slope with a graduated tape which is held as nearly parallel to the ground as possible. The measured distance is reduced to horizontal distance by calculation, the slope of the tape or the difference in elevation of the ends of the tape being known.

code, numeric

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
A code (1) which uses numbers to convey information.

Euler equation

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
Any one of a number of equations discovered by Euler. In particular, Euler's equations of motion or the equation relating the various characteristics of an elliptical orbit.

error, erratic

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
An error caused by an incomplete or deficient component of an instrument e.g., backlash in a gear train.

datum, digital

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE data, digital. However, number or value is better.

leveling, geostrophic

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
The art or process of determining the difference in elevation between two points at mean sea level by measuring the speed of the current between known points and assuming that the water is in geostrophic equilibrium, i.e., that the hydrostatic pressure is balanced by the Coriolis force per unit area. ...

level, Talcott

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE Horrebow-Talcott level.

modulus of precision

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
The quantity 1/s, in which s is the standard deviation of measurements.

baseline

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
(1) An imaginary line connecting two points and used as a referent for measurements. More particularly, (a) The line joining the antennas of a pair of transmitting stations in a radio-navigation system. Also spelled base line. (b) The line joining the phase centers of the ends of an array of antennas. ...

flowchart

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
A diagram showing the steps to be taken in solving a problem, doing a computation or carrying out a project. The flowchart for computational purposes was originated by von Neumann and has been accepted as an essential first step in encoding an algorithm for calculation on a computer. The symbols have ...

camera, precise

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
A camera whose optical qualities are good enough that the camera can be used photogrammetrically. Also called a "precision camera". There is no clear distinction between a precise camera and a metric camera.

radius vector

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
(1) The directed line or distance from the origin of a polar or spherical coordinate system to a specified point. (2) A line drawn from the pericenter of an orbit to a point on that orbit. Also called a position vector. Note that the radius vector so defined is not a directed line.

water, lower high (low)

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
(1) The lower of two high (low) waters of any tidal day. (2) The lowest of the high (low) waters of any specified tidal day due to the declinational effects of the Moon and Sun. (3) The lower of two high (low) waters of any tidal day where the tide exhibits mixed characteristics.

date, civil

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE date (2).

plate constant

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
One of a set of constants in the pair of equations relating the standard coordinates of a celestial body to the rectangular, Cartesian coordinates of the photographic image of that body. SEE ALSO Turner's plate constant.

deflection of the vertical, absolute

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE deflection of the vertical, gravimetric.

contact plate

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE plate, focal-plane.

strainmeter

Posted By Mr. Matthew Austin 09-05-2025 02:59 PM
Found In : Glossary
SEE extensometer.