- Industry: Earth science
- Number of terms: 93452
- Number of blossaries: 0
- Company Profile:
Founded in 1941, the American Congress on Surveying and Mapping (ACSM) is an international association representing the interests of professionals in surveying, mapping and communicating spatial data relating to the Earth's surface. Today, ACSM's members include more than 7,000 surveyors, ...
Equipment for lettered material on photographic positives that can be incorporated directly with other material that is to be reproduced and printed. The equipment consists of two independent units: an electric typewriter that produces typewritten copy and a perforated tape; and a photographic unit to which the tape is fed at any convenient time and which then produces a right-reading film suitable for stick-up work.
Industry:Earth science
The process of revising maps using aerial photographs and other available sources to show planimetric changes since the date of the latest existing map.
Industry:Earth science
One of a pair of coordinates in a rectangular coordinate system in the plane, i.e., in a plane rectangular coordinate system (1). In geodesy, plane rectangular coordinates are usually calculated from data given in the form of distances and directions (bearing or azimuth) between points. The methods used are those of plane geometry and trigonometry. The location of a point on the Earth may be given by plane rectangular coordinates on a plane tangent to the representing ellipsoid or by plane Cartesian coordinates on a cone or cylinder tangent or secant to that ellipsoid.
Industry:Earth science
A general formula for numerical integration of a function f(x) between limits x <sub>o</sub> and x <sub>o</sub> + NΔx:<br>
Industry:Earth science
(1) Convergent photography done so that the horizon does not lie within the cameras' fields of view. (2) Twin low-oblique photography using a pair of cameras whose optical axes point downwards and towards each other along the line of flight. This kind of photography gives a greater base-height ratio.
Industry:Earth science
(1) The theory and practice of measuring areas of figures on a plane. (2) The determination of horizontal distances, angles and areas from measurements on a map. (3) The determination of horizontal distances, angles or areas by photogrammetric methods. (4) Horizontal measurements. (5) The information contained, in a map, on horizontal distances and angles. (6) Those parts of a map which represent everything except relief, that is, those parts which represents the works of man and natural features such as woods and water.
Industry:Earth science
A vacuum tube having one surface capable of emitting one or more electrons when illuminated, and a sequence of other surfaces which emit several electrons for each incident electron. The electrons emitted by the light-sensitive surface are guided by an electrostatic field to a second surface which then emits many more electrons, and the process is carried through several more such surfaces until a cascade of electrons is formed. These form a current which is amplified and measured.
Industry:Earth science
(1) The narrow strip or zone embracing that part of the land which is affected by waves both above and below the surface of a lake, sea or ocean. The term does not apply to tidal flats or marshes which are overflowed by the tides, but essentially to strips of land which has an appreciable slope towards the water. It is questionable whether the above definition can be used or not. That part of a wave which is underwater can affect the bottom for a considerable distance seaward from the line marking the uttermost extent to which the land appears periodically above the water. (2) The line along which the land meets the surface of a lake, sea, or ocean. (3) The intersection of a specified marine surface with the shore or beach. The line delineating the ocean shoreline on nautical charts of the U.S. National Ocean Survey approximates the line of mean high water. (4) The line along which the surface of the land meets the surface of a lake, sea, or ocean. (5) That part of the land which is affected by the action of waves. The term does not apply to tidal flats or marshes which the tides overflow, but essentially to strips where the land has an appreciable slope outward to the water.
Industry:Earth science
