- 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, ...
A device which transmits a specified band or bands of frequencies in the infrared part of the spectrum while substantially attenuating radiation at other frequencies. The various types of optical filters have their counterparts among infrared filters.
Industry:Earth science
A unit of area, in the English system of measure, equal to the area contained with a square 1 foot on a side. It is not usually used as a measure of land area; the acre is preferred except where, as in large cities, land is very costly. It is approximately equal to 0.092 903 04 square meter. Note that it is not a primary unit of area but is defined in terms of the foot.
Industry:Earth science
A unit of illuminance equal to one lumen of incident light per square foot.
Industry:Earth science
The distortion of photographic film with changes in humidity or temperature, or from aging, handling or other such causes.
Industry:Earth science
A statement of the Coriolis effect as applied to the motion of winds.
Industry:Earth science
An extensive, linear region (of the sea floor) of unusually irregular relief and having large seamounts and steep-sided or irregular ridges, troughs or escarpments.
Industry:Earth science
A binocular dumpy level, constructed of invar, having the spirit level placed in the tube of the telescope and quite close to the line of collimation. An arrangement of mirrors and prisms brings an image of the bubble to the one eyepiece; the leveling rod is viewed through the other. The telescope is so mounted that its inclination can be adjusted through a small angle without changing its elevation. The observer views the leveling rod with the right eye and at the same time views the bubble with the left eye. By turning a screw, the inclination of the telescope is adjusted until the bubble is seen in the middle of its tube. The leveling rod is read with the bubble in the average position. The Fischer level was designed by E.G. Fischer and adopted by the U.S. Coast and Geodetic Survey in 1899 (the use of invar in its construction is of more recent date.) It is no longer in use, although it is one of the most sensitive and accurate leveling instruments. It has been replaced by types easier to set up and adjust.
Industry:Earth science
A succession of overlapping aerial photographs taken along a single course.
Industry:Earth science
Used to specify the dimensions at each end of a lot or part, as, e.g. 50 feet front and rear and implying the length in front as the length on the street or easement line and the length in the rear as the length on the portion of the boundary opposite the front. Obviously, the term's meaning is uncertain if it is applied to a corner lot with adjacent frontages on the streets. It is also indeterminate if applied to a lot having double frontage on the street; i.e., frontage on each end of the lot.
Industry:Earth science
