MetaGlossary.com: Geodetic Control

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Keywords: Datum, Gis, Carefully, Accuracy, Plss

Related Terms: Contour , Bench Mark, Chart, Datum, Geodetic, Line, Plot, Quadrangle, Station, Surveying, Topographic, Topography, Georeference, Contour Line, Digital Terrain Model, Dtm, Topographic Map, Metes And Bounds, Digital Elevation Model, Grid, Rectangular Survey System, Base Map, Doq, Hypsography, Coordinate Systems, Map Scale, Planimetric, State Plane Coordinate System, Contour Lines, Bar Scale, Contour Map, Dem, Planimetric Map, Grid North, Terrain , Relief Map, Contour Interval, World Geodetic System, Georeferencing, Vertical Datum, Cogo, Wgs84, Topographical Map, Coordinate Geometry, Topographic Survey, Geodetic Survey, Wgs, Geodetic Datum, Gage Datum, Nad 27

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a network of surveyed and monumented points on the earth's surface whose locations are established in accordance with national accuracy standards. A state plane coordinate system comprises a system of x, y coordinates for each state and is commonly used in GIS.

http://www.sph.umich.edu/geomed/htmls/glossary/glossary.html

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A network of carefully measured points that can be used as a reference for other surveys or to establish or measure accuracy in map making. Horizontal control and vertical control networks are typically separate because the former is based on an ellipsoid model of the earth, while the latter is based on a geoid model. See Also: ellipsoid, geoid More information on Geodetic Control.

http://www.geography.wisc.edu/sco/references/glossary_links.php?sort=G

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A system of horizontal and/or vertical stations tied into horizontal and/or vertical datums, which are established to facilitate the location of other features on, above or below the earth's surface (see Datum).

http://www.granit.sr.unh.edu/cgi-bin/load_file?PATH=/about/gloss.html

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Locating map features correctly in relation to their actual locations on the surface of the earth. Features on digital maps used in a GIS should represent, as faithfully as possible, the true geographic locations of places on the earth and the true spatial relationships between these places on the earth. One important way to aid this endeavor is to register key points in the digital map to the real world coordinates of those points on the ground. These real world coordinates should be in one or another of the recognized projections, units, and datums. The map is then said to be "in control." Doing this will greatly aid the internal consistency and accuracy of the digital map and support the use of this digital map with any others that are similarly in control. This is not the same as having your base map tied to the Public Land Survey system (PLSS) of townships and sections. The PLSS is important in land ownership descriptions, but its section corners may or may not have geodetic control coordinates (coordinates representing a position on the earth in an established coordinate system) established for them.

http://www.gis.state.mn.us/iisac/apd-c.html

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A network of carefully measured horizontal and vertical points. An accurate geodetic network provides the foundation for photogrammetric mapping.

http://www.surdex.com/html/mapping_glossary.html

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