- 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, ...
Adjustment of the elevations or differences of elevations in a vertical network.
Industry:Earth science
That point, in an elliptical orbit of a planet or comet, which is farthest from the Sun.
Industry:Earth science
Work required to be performed annually by the claimant in order for him to maintain a possessionary right to a mining claim for which a patent has not been issued.
Industry:Earth science
The distance, along a great circle, between points on a sphere taken as equivalent to the figure of the Earth.
Industry:Earth science
Determining elevations from measurements made with an airborne altimeter.
Industry:Earth science
A pendulum apparatus having two working pendulums hanging from the same support. In use, the two pendulums are set swinging in opposite directions. The effect of flexure in the support is thereby almost entirely canceled, as is the effect of microseisms. The Cambridge pendulum apparatus is an outstanding example.
Industry:Earth science
(1) As observed; as seen. (2) Measurable or observable, referring to characteristics of real or visible bodies. The term, common in the older scientific literature, is now used mostly by astronomers.
Industry:Earth science
(1) A map on which information can be placed for comparison or for geographical correlation. The term base map was at one time applied to a class of maps now known as outline maps. It may be applied to topographic maps (also called mother maps in jargon) which are used in the construction of many special types of maps by adding particular data. (2) A map from which other maps are prepared by adding information. In particular, a planimetric map used in preparing topographic maps.
Industry:Earth science
The difference between the direct bearing and the back bearing, caused by meridional convergence.
Industry:Earth science
The placing of additional data, drawing of new features, or deletion of destroyed or unimportant features on a photographic mosaic to show only current details. It may include elevations of airfields, cities, and large bodies of water; new structures and destroyed or dismantled bridges, dams, or railroads.
Industry:Earth science
