Change Detection

In: Other Topics

Submitted By dharris77
Words 3616
Pages 15
Different Change Detection Techniques

Table of Contents

Introduction...................................................3
Digital Change Detection Process...............................4
Description of the most commonly used change detection methods.5 I. Post-Classification Comparison..........................5 II. Direct Classification...................................6 III. Principal Component Analysis (PCA)......................6 IV. Image Differencing......................................8 V. Change Vector Analysis (CVA)............................9

Relative accuracy of the most commonly used change detection methods........................................................9

I. Post-Classification Comparison.........................10 II. Direct Classification..................................11 III. Principal Component Analysis (PCA).....................11 IV. Image Differencing.....................................12 V. Change Vector Analysis (CVA)

Conclusion....................................................14

References....................................................15

Introduction
Remote sensing change detection has been defined as the process of identifying change in the state of an object or phenomena through the detection of differences between two or more sets of images taken of the same area on different dates (Wang, 1993). The underlying assumption is that changes on the ground cause significant changes in image pixel values (Zhang et al., 2002). Change detection is a vital technique in remote sensing because it plays a role in monitoring and managing natural resources and urban development providing quantitative analysis of the spatial distribution of the population of interest.
Change detection is useful in such diverse applications as land use change analysis, monitoring shifting…...

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