- 行业: 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, ...
A base line(2b), for triangulation, consisting of two or more lines that form a continuous line and have the same general direction.
Industry:Earth science
An atlas depicting different aspects of a specific part of a country or continent.
Industry:Earth science
The axis (line) about which the telescope or alidade of an instrument rotates when rotated in a vertical plane. For an instrument in perfect adjustment, it is perpendicular to the standing axis of the instrument and to the collimation axis of the telescope. It should coincide with the line through the centers of the pivots that support the telescope. For an instrument in perfect adjustment and properly leveled, this axis is horizontal; when the telescope is rotated around it, the collimation axis will define a vertical plane. Deviations from proper instrumental adjustment are measured with a striding level or a hanging level.
Industry:Earth science
(1) A composite picture made by superposing one picture (of a stereoscopic pair) in one color on the other picture which is in a complementary color. The usual colors are red and blue green. When viewed through spectacles in which one lens is a red filter and the other is a blue green filter, the anaglyph provides a three dimensional effect to the viewer. The same kind of effect can be produced by projecting the individual pictures onto a white surface through filters of the proper (e.g., red and blue green) colors. Anaglyphs of this kind are used in photogrammetric plotters.
(2) A pair of stereoscopic pictures, one picture of the pair being in one color and the other picture in the complementary color.
Industry:Earth science
An imaginary line through the optical center of the lens system and perpendicular to the focal plane of the camera.
Industry:Earth science
A roof prism which deviates rays of light through 90° and inverts the image. It may be considered an ordinary prism having right angled isosceles triangles as bases, in which the face forming the hypotenuse is replaced by two plane reflecting surfaces placed at right angles to each other and forming the roof of the prism.
Industry:Earth science
(1) An axis perpendicular to the longitudinal axis of a craft, generally in the plane of symmetry of the craft, and oriented positively to the right looking forwards.
(2) The line joining the apsides of an orbit. It is identical with the major axis of elliptical orbits.
Industry:Earth science
That line, on a photograph, joining the principal point on that photograph to the point, on the same photograph, which corresponds to the principal point on another (overlapping) photograph.
Industry:Earth science
