LAND SURVEY TERMS “U”
GLOSSARY OF U.S. BUREAU OF LAND MANAGEMENT SURVEYING AND MAPPING TERMS
Land Survey Terms “U”, A convenient source for our clients and website visitors
UA (Land Status Records) – Unit Agreement.
UINTAH SPEC MER (Land Status Records) – Uintah Special Meridian.
UNAPPROP (Land Status Records) – Unappropriated.
UNDET (Land Status Records) – Undermined.
UNDGD (Land Status Records) – Underground.
UNSUR (Land Status Records) – Unsurveyed.
UPS – Universal Polar Stereographic.
UR (Land Status Records) – Uranium.
USAF (Land Status Records) – United States Air Force
U.S.A.S.I. – U.S.A. Standards Institute (Formerly A.S.A.).
UTM – Universal Transverse Mercator.
U.V. – Ultra Violet.
ULTRAVIOLET ABSORBING FILTER – A haze cutting filter used mainly in photography with color films to avoid excessive bluishness and loss of contrast in the pictures; usual designations are U.V.; Haze; Wratten 2A.
ULTRAVIOLET RADIATION – Electromagnetic radiation of shorter wavelength than visible radiation but longer than X-Rays; roughly, radiation in the wavelength interval between 10 and 4000 angstrom units.
ULTRA-VIOLET RAYS – Radiant energy in the ultraviolet portion of the electromagnetic spectrum.
ULTRA-WIDE-ANGLE LENS – A lens having a coverage in excess of 100 . See SUPER WIDE ANGLE LENS.
UNCONTROLLED MOSAIC – A mosaic in which the photographs have not been positioned by reference to horizontal control.
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UNDA – That part of the floor of the ocean which lies in the zone of wave action, and in which the bottom is repeatedly stirred and reworked by storm waves.
UNDAFORM ZONE – That part of the ocean floor which lies in the zone of wave action and in which, therefore, the bottom is repeatedly stirred and reworked by storm waves.
UNDERGROUND MARK – A surveying mark set and plumbed below the center of a surface mark and separated therefrom so as to preserve the station in case of accident to the surface mark.
UNDERWATER CONTOUR – A contour shown in an inundated area. See DEPTH CURVE.
UNITED STATES NATIONAL MAP ACCURACY STANDARDS – 1) Horizontal accuracy; For maps at publication scales larger than 1:20,000, 90 percent of all well-defined features, with the exception of those unavoidably displaced by exaggerated symbolization, will be located within 1/20 inch (0.85 mm) of their geographic positions as referred to the map projection; for maps at publication scales of 1:20,000 or smaller, 1/50 inch (0.05 mm). 2) Vertical accuracy: 90 percent of all contours and elevations interpolated from contours will be accurate within one-half of the basic contour interval. Discrepancies in the accuracy of contours and elevations beyond this tolerance may be decreased by assuming a horizontal displacement within 1/50 inch (0.50 mm). Commonly referred to as Map Accuracy Standards.
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UNIVERSAL PLOTTER – A stereoplotter capable of compiling contour maps from vertical or oblique aerial
photography as well as terrestrial photography. A true universal plotter will accept photographs from any focal length camera.
UNIVERSAL POLAR STEREOGRAPHIC – A map designed for military use based on a Polar Stereographic Projection covering to the poles from 84 N. and 80 S. latitudes.
UNIVERSAL PROJECTION PRINTER – See PROJECTION PRINTER.
UNIVERSAL TABLE FRAME – A supporting frame for stereoplotters, specially designed to accommodate the
projectors of any of the various types of direct-viewing double-projection plotters.
UNIVERSAL TRANSVERSE MERCATOR PROJECTION – A special case of the transverse Mercator projection. Abbreviated as the UTM grid, it consists of 60 north-south zones, each 6 wide in longitude.
UNIVERSAL WATER CHARTS – A series of blank charts at 1:1,000,000 scale, published for each 4 band of latitude. They are used for aerial navigation over water or for plotting positions, distances, and courses in land travel over unmapped areas, such as in Antarctica.
UPDATING – Addition of recent changes to a map.
See SKETCHMASTER, RADIAL LINE METHOD, TRIANGULAR DIVISION METHOD and REFLECTING PROJECTOR METHOD.
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