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Affine transformation
A geometric transformation, skew and differential scaling on a rectangular object, while preserving line parallelism.

Bilinear interpolation
A resampling method that uses the distanceweighted average of the four nearest pixel values to estimate a new pixel values.

Cubic convolution
A resampling method that uses the distanceweighted average of the 16 nearest pixel values to estimate a new pixel value.

Geometric transformation
The process of converting a map or an image from one coordinate system to another by using a set of control points and transformation equations.

Ground control points (GCPs)
Points used as control points for an imagetomap transformation.

Imagetomap transformation
One type of geometric transformation that converts the rows and columns of a sattellite image into realworld coordinates.

Maptomap transformation
One type of geometric transformation that converts a newly digitized map into realworld coordinates.

Nearest neighbor
A resampling method that uses the nearest pixel value to estimate a new pixel value.

Pyramiding
A technique that builds different pyramid levels for displaying large raster data sets a different resolutions.

Resampling
A process of filling each pixel of a newly transformed image with a value or derived value from the original image.

Root mean square (RMS) error
A measure of the deviation between the actual location and the estimated location of the control points in geometric transformation.