Listing of Glossary
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Acquiring data about features of interest in remote sensing by collecting ground-truth data in the field, inspecting aerial photography, additional maps, other ancillary data.
Assigning map coordinates to an image. Usually involves resampling of pixels to extrapolate the values for the new pixels.
Data about a feature collected in the field.
related to the science of earth measurement (geodesy).
|Geographic information system (GIS)||
the organized activity by which people measure aspects of geographic phenomena and processes; represent these measurements, usually in the form of a computer database, to emphasize spatial themes, entities and relationships; operate upon these representations to produce more measurements and to discover new relationships by integrating disparate sources; and transform these representations to conform to other frameworks of entities and relationships. These activities reflect the larger context (institutions and cultures) in which these people carry out their work. In turn, the GIS may influence these structures.
|Global Positioning System (GPS)||
Global Positioning System, a constellation of communications satellites that broadcast timing signals that can be converted into a distance measurement, permitting trilateration (surveying by knowing the sides of triangles).
A work of geographic reference that supplies place name and location information. When a place name is known, a gazetteer can provide the coordinates of the place. Most atlases contain gazetteers. Well-known digital gazetteers are the USGS Geographic Names Information System (GNIS) and the gazetteer in the Digital Chart of the World (DCW). In ARC/INFO the gazetteer spatial index is done as a grid of alpha and numeric references which is converted into a polygon coverage. Places (points or polygons) are then overlaid with this grid, then sorted alphabetically. This produces a list of place names sorted both alphabetically and by reference grid number.
Geodatabase stands for geographic database and stores geographic information inside a DBMS or database management system. A geodatabase supports advanced capabilities such as geometric and logical networks, true curves, complex polylines, and user-defined features. They are the modern equivalents of shapefiles and coverages stored in a DBMS. Geodatabases support large collections of objects in a database table and features with geometry. The feature classes and tables contained in geodatabases can be related to one another. In order to define the relationships between objects in a geodatabase, a relationship class must first be created. These relationships allow someone to use attributes stored in a related object to symbolize, label, or query a feature class.
A set of points on the surface of the Earth, the positions of which have been accurately determined using surveying and computing techniques that take into account the Earth’s curvature, topography, gravity field and atmosphere.
Information concerning phenomena implicitly or explicitly associated with a location relative to the Earth