Glossary


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Rasterization
Conversion from vector to raster data. It is sometimes called vector raster conversion.

Raster Model
A model to represent spatial objects with regularly spaced grid cell in specific sequence. Raster model has advantages of simple data structure, easiness of overlay, flexible visualization and automated data capture.

Relational Database
A collection of normalized relations that are given as a set of two dimensional table where each row corresponds to one element of the relation, and each column contains attributes. The relation between tables can be connected with common attributes.

Remote Sensing
Art and science of obtaining reliable information about physical objects and the environment through the process of recording, measuring, interpreting and displaying imagery there of derived from non-contact sensor systems.

Resampling
Rearrangement of image data in the transformed coordinate system into geo-coded image, using coordinate transformation and interpolation.

Resampling is essentially used in the geometric correction of remote sensing data.

Resolution
Detailness represented by frequency of signals per unit distance or time.

line pairs per mm.........image resolution

meters on the ground.......ground resolution

dot per inch (dpi).......... dot resolution

frequency of the pass .......... temporal resolution

Retrieval
Selection or reference of specific spatial data without modifying the geographic location and spatial features stored in the database. (see Query)

RGB
Three primary colors; Red, Green and Blue in additive color system, such as color TV monitor. In subtractive color system, Yellow (Y), Magenta (M) and Cyan (C) are primary colors.

Rook's move
Four directions from the center of a window of 3x3 matrix with a sequence code number by which a line or flow can be represented. The Rook's move has come from the chess game.

Run Length
A raster data structure by which as area object is represented by a set of start pixel No. and number of pixels of homogeneous attributes with respect to each scan line.


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