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Tallahassee 850.385.1133 Pensacola 850.434.7600 Fax 850.434.7613 Atlanta 678.296.6575 Fax 770.234.5314
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Cartography The art and science of map production. This includes the construction of projections, design, compilation, drafting and reproduction. Electronic surveys Electronic surveys utilize total station, data collector and computer technologies for the gathering, transfer and manipulation of field data. Elevation The height above mean sea level. Geodesy (also called geodetics) A scientific discipline concerned with measuring and representing the earth on a global scale, along with the precise location of points on its surface. "Practical Geodesy" or "Engineering Geodesy," is concerned with measuring specific parts or regions of the Earth. Geodesy encompasses the earth's gravitational field, crustal motion, oceanic tides, and polar motion. Geographical coordinates A point on a map given as latitude and longitude readings, with values given as degrees, minutes and seconds. Geographic information system Computers and software used to explore the fundamental principles of geography; a system intended for analysing and displaying geographically referenced information. Global Positioning System GPS is a satellite based navigation system originally developed by the United States' Department of Defense. A GPS receiver calculates a position by measuring distances to four or more satellites orbiting the earth at all times. LiDAR LiDAR stands for Light Detection and Ranging, and is also known as Airborne Laser Swath Mapping (ALSM) or laser altimetry. LiDAR is an optical remote sensing technology which uses an airborne scanning laser to produce detailed topographic surveys. LiDAR can accurately measure the topography of the ground, even where overlying vegetation is quite dense. LiDAR uses a laser pulse to determine distances by measuring the time delay between its transmission and reflection. Orthophoto Aerial photographic images altered using an 'orthophoto verification' process to remove distortions and capable of registering perfectly with cadastral data. An orthophoto shows features in their true plan positions, removing unwanted relief and height displacement which otherwise skew the data. Photogrammetry A photographic technique which gives measurements of the land from a series of photographs taken from the air. Through a series of precise mathematical calculations, the photographs can be analyzed by computer to produce extremely accurate maps and measurements. Photogrammetric base map A map or data produced from aerial photographs and geodetic control data using stereoscopic sources and methods. Route surveying Survey operations required for the design and construction of engineering works such as highways, pipelines, canals, or railroads. Traditional survey methods Traditional surveys include differential leveling, taping manually scribed data, cross sections and baseline-referenced topography. Topographic Maps or data showing correct horizontal (elevation) positions and contours of the features they represent. |
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