MAP-MRF approach to landsat ETM+ SLC-Off image classification

Xiaolin Zhu, Desheng Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Land cover classification is an important application of Landsat images. Unfortunately, the scan-line corrector (SLC) failure in 2003 causes about 22% pixels to remain unscanned in each Landsat 7 ETM+ image. This problem seriously limits the application of Landsat 7 ETM+ images for land cover classification. A common strategy for addressing this problem is filling the unscanned gaps before classification work. However, the simple and high-speed methods for gap-filling cannot yield satisfactory results, especially for heterogeneous landscapes, while the gap-filling methods with high accuracy are often complicated and inefficient in the use of time. This paper develops a new method based on the maximum a posteriori decision rule and Markov random field theory (the MAP-MRF classification framework) for classifying SLC-off ETM+ images without filling unscanned gaps beforehand. The proposed method efficiently avoids the complicated process for gap-filling. The performance of the proposed method was validated by simulated SLC-off images. The results show that the classification accuracy of the proposed method is even higher than that of classification from an image filled by the precise gap-filling algorithm neighborhood similar pixel interpolator, which indicates that an accurate land cover map can be generated without spending time and effort to fill gaps in SLC-off images prior to the land cover classification.
Original languageEnglish
Article number6488816
Pages (from-to)1131-1141
Number of pages11
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume52
Issue number2
DOIs
Publication statusPublished - 1 Feb 2014
Externally publishedYes

Keywords

  • Classification
  • Landsat ETM+
  • Markov random field (MRF)
  • scan-line corrector (SLC)-off

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

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