## Image Assessment System (IAS) Geometric Algorithm Theoretical Basis Document

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This document describes the geometric algorithms used by the Landsat 7 Image Assessment System (IAS). These algorithms are implemented as part of the IAS Level 1 processing, geometric characterization, and geometric calibration software components. The overall purpose of the IAS geometric algorithms is to use Earth ellipsoid and terrain surface information in conjunction with spacecraft ephemeris and attitude data, and knowledge of the Enhanced Thematic Mapper Plus (ETM+) instrument and Landsat 7 satellite geometry to relate locations in ETM+ image space (band, scan, detector, sample) to geodetic object space (latitude, longitude, and height).

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