Glossary


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Centroid
Center of gravity of a polygon.

Chain
A line or a string with topology of chain ID No., start and end No., left and right polygon No.

Color Composition
Combination of three primary colors that are assigned to three selected spectral bands. Red, green and blue (RGB) are used for additive color composition, while yellow, magenta and cyan (YMC) for subtractive color composition.

Color Ink Jet Recorder
An image output device to produce a raster image with fine color ink dots with the resolution of 200 ~ 400 dpi (dot per inch).

Coordinate Transformation
A mathematical procedure to transform a coordinate system to another coordinate system.

Control Point
Reference point with known coordinates that are used for coordinate transformation or geometric correction. In remote sensing, GCPs (ground control points) is often used.

Curve Fitting
Generation of a fitted curve which passes through or nearby all given points. Spline curve or B Spline curve is a popular curve fitting.

Cubic Convolution
An interpolation technique to estimate an image data using the three dimensional convolution defined by 4x4=16 surrounding pixels in the original image data. Cubic convolution has an effect of stretching the contrast and sharpness.


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