Glossary


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Generalization
A technique to reduce the amount of data under the condition to retain the amount of information. Generalization is used to produce smaller scale maps from large scale map.

Geocentric Coordinate System
A coordinate system to represent three dimensional position on the earth under the assumption that the earth is approximated as a sphere.

Geo-coded Image
Image which is corrected by matching with geographic coordinate system. Geo-code is usually represented by latitude and longitude.

Geodetic Coordinate System
A coordinate system to represent three dimensional position on the earth of ellipsoid shape with longitude (angle measure from the Greenwich Meridian), latitude (angle measured between the equatorial plane and the normal line of the ellipsoid) and height in the normal line.

Geometric Correction
Correction of geometric distortions involved in the original image, which are caused by sensor characteristics and geometry, attitude of platform and topography of the earth.

Geospatial Data
Information that identifies the geographic location and characteristics of natural or constructed features and boundaries on the earth. Statistical data may be included.

GIS
Geographic information system is an information system that used to input, store, retrieve, manipulate, analyze and output geographically referenced data or geospatial data for supporting decision making.

GPS
Global positioning system by which three dimensional geographic coordinates are measured with signals from multiple satellites received by GPS antenna.

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