- 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 nonreproducible blue image or outline usually printed photographically on paper or plastic sheeting, and used as a guide for drafting, stripping or layout. Sometimes called blind image.
Industry:Earth science
A pipe carrying sewage from the plumbing system of a building to a larger sewer serving several buildings or to a disposal point.
Industry:Earth science
(1) A hard layer of rock covered by soil, sediment, etc. , and more or less continuous over a large region. It is distinguished from silt, clay, etc. , by being hard, and from sand, pebbles, and boulders by being continuous. Bedrock which has been cleared of its covering is referred to as exposed bedrock. Large, deeply imbedded boulders, with upper surfaces planed and leveled through exposure, are some-times erroneously reported as bedrock in descriptive writing. (2) A stratum of rock in the Earth's crust which has been formed in an approximately horizontal position.
Industry:Earth science
A continuous color or shading applied to parts of a map other than those parts bounded by isopleths and indicating quantitatively some characteristic of the region depicted.
Industry:Earth science
(1) The point at which the Moon's surface is intersected by the lunar radius directed towards the Earth's center when the Moon is at the mean ascending node and the node coincides with mean apogee or mean perigee. (2) A central point, on the Moon, selected as an origin for a coordinate system for the Moon's surface.
Industry:Earth science
A method of plate reduction developed by Z. Cephlecha and applied to determining the locations of meteors and satellites.
Industry:Earth science
The surface defined by the zero-th and second degree terms and a term representing centrifugal force, in the representation of the Earth's gravity potential by a series of Legendre functions.
Industry:Earth science
Classification of the elevations (or differences of elevation) in a leveling network according to their accuracy or other characteristic. Class-ification of an elevation (vertical control) according to its accuracy is inseparable from the classification of the leveling network in which the elevation occurs, because the values of all the differences of elevation in a particular network are solved for simultaneously - usually by the method of least squares. The U. S. National Geodetic Survey uses the same categories for classifying vertical control as it uses for classifying leveling and leveling networks networks. The criterion used for each category is derived in a complicated fashion but is roughly as follows:<br>
Industry:Earth science
(1) The external or limiting lines of any object or space. For example, in to set bounds, as of a property. (2) That which limits or restrains, or within which something is limited or restrained. Terms of similar meaning are limits, confines and boundaries.
Industry:Earth science
Designating or pertaining to an obligation or security attached to another to secure its performance.
Industry:Earth science
