Title page for ETD etd-32198-21323


Type of Document Master's Thesis
Author Carter, Duane B.
Author's Email Address ducarter@vt.edu
URN etd-32198-21323
Title Analysis of Multiresolution Data fusion Techniques
Degree Master of Science
Department Geography
Advisory Committee
Advisor Name Title
Campbell, James B. Jr. Committee Chair
Randolph, John Committee Member
Wynne, Randolph H. Committee Member
Keywords
  • Data Fusion
  • Brovey Transform
  • High-Pass Filter
  • Intensity-Hue-Saturation
  • Multiplicative
  • Principal Components Transformation
Date of Defense 1998-03-23
Availability unrestricted
Abstract
In recent years, as the availability of remote sensing imagery of varying resolution has increased, merging images of differing spatial resolution has become a significant operation in the field of digital remote sensing. This practice, known as data fusion, is designed to enhance the spatial resolution of multispectral images by merging a relatively coarse-resolution image with a higher resolution panchromatic image of the same geographic area. This study examines properties of fused images and their ability to preserve the spectral integrity of the original image. It analyzes five current data fusion techniques for three complex scenes to assess their performance. The five data fusion models used include one spatial domain model (High-Pass Filter), two algebraic models (Multiplicative and Brovey Transform), and two spectral domain models (Principal Components Transform and Intensity-Hue-Saturation). SPOT data were chosen for both the panchromatic and multispectral data sets. These data sets were chosen for the high spatial resolution of the panchromatic (10 meters) data, the relatively high spectral resolution of the multispectral data, and the low spatial resolution ratio of two to one (2:1). After the application of the data fusion techniques, each merged image was analyzed statistically, graphically, and for increased photointerpretive potential as compared with the original multispectral images. While all of the data fusion models distorted the original multispectral imagery to an extent, both the Intensity-Hue-Saturation Model and the High-Pass Filter model maintained the original qualities of the multispectral imagery to an acceptable level. The High-Pass Filter model, designed to highlight the high frequency spatial information, provided the most noticeable increase in spatial resolution.

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