- 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, ...
The process of deriving astronomical coordinates of a celestial object whose images appear on one or more photographs, by measuring the plane coordinates of that image and of images of stars (of known astronomical coordinates) on the same photographs.
Industry:Earth science
An aerial or terrestrial photograph not used directly for mapping but used to add to or improve details in maps or charts.
Industry:Earth science
Aerial photography in which the optical axis of the camera (or cameras) is pointed so that the apparent horizon lies within the field of view of the camera.
Industry:Earth science
(1) The greatest angle subtended, at a celestial body, by an equatorial radius of the Earth or of a rotational ellipsoid representing the Earth. (2) The angle subtended, at a celestial body, by a line from a hypothetical observer to the center of the Earth or a rotational ellipsoid representing the Earth, when the observer is at the equator and the celestial body is on the observer's horizon. If a denotes the equatorial radius of the ellipsoid (definition 1) or the distance of the observer from the center of the Earth or the ellipsoid (definition 2), and if r is the geocentric distance of the body, then the equatorial horizontal parallax is arcsin(a/r).
Industry:Earth science
A counter attached to a wheel of a vehicle to count the number of turns made by the wheel in traveling over the ground. Most odometers indicate the distance traveled by the vehicle, i.e., they multiply the number of turns by the circumference of the wheel.
Industry:Earth science
A method for cementing a photographic print to a base by means of a thin tissue of thermoplastic material. The tissue is placed between the print and the base, and sufficient heat applied to melt the tissue.
Industry:Earth science
The method of representing relief, on a map, so as to give an impression of seeing a three-dimensional model illuminated obliquely, by plotting the intersections of a series of parallel, equally spaced, inclined planes and conventional contours. Through these intersections, isograms are drawn to represent perpendicular distances above or below a hypothetical surface of reference intersecting the geoid (assumed flat) at a constant and predetermined angle. The isograms are sometimes called inclined contours. The method was first proposed by Kitiro in 1932.
Industry:Earth science
The process of making maps from various types of photographs, using information from surveys and/or other maps.
Industry:Earth science
Photography in which the location of the camera is determined by measuring distances from Shoran equipment aboard the photographing aircraft to each of two fixed Shoran stations while photographs are being taken.
Industry:Earth science
