T6-Geometric Correction_3slides

T6-Geometric Correction_3slides - Geography 333 Remote...

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1 Geography 333 Remote Sensing I Topic 6: Geometric Correction 2 Readings Topic 5: Chapter 6 (Radiation Principles) Topic 6: Chapter 7 (Geometric Correction) Topic 7: Chapter 2 (Sensors) 3 Outline Image pre-processing overview Geometric errors Spatial interpolation Polynomial method Thin plate spline 3D physical models DN interpolation
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2 4 Image Pre Processing Remotely sensed images are subject to a number of errors and distortions Geometric Radiometric Image restoration : correction of imagery to a state as close as possible to original scene conditions 5 Pre Processing, Cont… Even restored images may have undesirable geometric and radiometric qualities Earth’s curvature, atmospheric refraction, topographic distortion Specific RS projects often demand higher orders of pre-processing Radiometric normalization, atmospheric correction Image-to-image registration, geometric rectification Image rectification: transforming and image from one grid system to another (e.g. image row and column coordinates to map projection coordinates) Canadian Centre for Remote Sensing 6 Geometric Errors: Systematic Systematic distortions Scan skew Mirror scan velocity variance Earth rotation Platform velocity Corrected with mathematical formulas
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3 7 Geometric Errors: Non-Systematic Unforeseen changes in the sensor’s geometry, such as altitude variance and platform attitude (roll, pitch, yaw) Relief displacement Corrected by ground control points (GCPs) and rectification 8 Relief Displacement Objects closer to the sensor appear larger than objects further away Scale varies with terrain The tops of objects are displaced from their base Objects standing above the terrain ‘lean’ away from the principal point 9 Radial Nature of Relief Displacement
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4 10 Based on geometric clues, is the scene below an aerial photograph or a high-resolution satellite image, or neither? A. Aerial photograph
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This note was uploaded on 01/18/2011 for the course GEOG 331 taught by Professor Staff during the Fall '08 term at Kansas.

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T6-Geometric Correction_3slides - Geography 333 Remote...

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