Glossary - C

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Calibration - The act or process of comparing certain specific measurements in an instrument with a standard.

Calibration Data - In remote sensing, measurements pertaining to the spectral or geometric characteristics of a sensor or radiation source. Calibration data are obtained by using a fixed energy source such as a calibration lamp, a temperature plate, or a geometric test pattern.

Calibration Parameter File (CPF) - The Calibration Parameter File (CPF) supplies the radiometric and geometric correction parameters required during Level 1 processing to create superior products of uniform consistency across the Landsat 7 system. They fall into one of three major categories: geometric parameters, radiometric parameters, or artifact removal parameters. Each CPF is stamped with applicability dates; then sent to the LP DAAC for storage and eventual bundling with outbound Level 0 products. The Image Assessment System (IAS) updates and distributes the CPF at least every 90 days.

Channel - A one-way communications link.

Coherent Noise - A spurious, periodic pattern of noise within an image, generally of electronic origin.