- 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, ...
Solid or liquid matter between the geoid and the lower boundary of the atmosphere. The topographic masses are all those parts of the hydrosphere and lithosphere lying outside the geoid.
Industry:Earth science
A compass having sights formed by standards with slits for sighting through, rather than a telescope.
Industry:Earth science
Phototriangulation using photographs taken from points on the ground. In its original form, the method was developed from plane-table surveying. The photographs were set up vertically on a drafting table in their proper directions from a point taken as the camera station, and then viewed through a special telescope similar to that used in plane-table surveying and using a similar procedure for drawing the map.
Industry:Earth science
A disk having a spiral sequence of holes along the outer part of the disk and rotating about its center so that when a beam of light shines on one side of the disk, a sequence of narrow, interrupted and gradually displaced beams of light issues from the other side. The Nipkow disk has been used in automatic stereoscopic plotting instruments to create a beam scanning a photographic image.
Industry:Earth science
The process of producing a pictomap by decomposing a photomosaic into three differently-colored pictures (by photographing a photomosaic through three different filters), masking out unwanted details, combining the result and placing on the composite names and other required information.
Industry:Earth science
An alidade consisting of a peepsight mounted on a straightedge in such a manner that the edge of the straightedge is parallel to the vertical plane in which the line of sight rotates.
Industry:Earth science
A photograph taken with a long-focal-length camera (over 250 cm) having a narrow field of view.
Industry:Earth science
The image, on a photograph, of any horizontal line perpendicular to the principal plane. All photograph parallels are perpendicular to the principal line.
Industry:Earth science
A point whose coordinates are defined and are part of a datum (usually a geodetic datum). The origin is usually a survey station.
Industry:Earth science
An engineer's transit designed particularly for surveying in mines. A mining transit is usually provided with an auxiliary telescope or other means of taking very sharply inclined (or even vertical) sights.
Industry:Earth science
