Remote Sensing and GIS glossary

A microwave band with a wavelength (frequency) interval ranging from 7.5 - 3.8 cm (4 - 8 GHz) in the electromagnetic spectrum.

The process of quantitatively defining the instrument response to known, controlled input signals.

A centroid (or geometric center) is a central point of an area feature that represents the average position of all the points in the shape.

An algorithm ascertaining the changes of specific features within a certain time interval.

The computational process of assigning pixels or objects into a set of categories, or classes, having common spectral, shape, elevation or other definable characteristics.

A clip is an overlay tool that involves clipping an input layer to the extent of a defined feature boundary.

Electromagnetic radiation whose waves are equal in direction, amplitude and phase, so that they are capable of exhibiting interference.

A technique used to adjust the color rendition between images to make transitions from one image to an adjoining image appear seamless.

The process of reducing the size of a file or database. Compression can improve data handling, storage, and database performance. See also lossy compression, lossless compression.

A conformal map projection preserves the correct shapes of small areas with the scale being the same in all directions and greatly distorted areas.