Extracting spectral contrast in Landsat Thematic Mapper image data using selective principal component analysis

P. S. Chavez, A. Y. Kwarteng

Research output: Contribution to journalArticle

404 Citations (Scopus)

Abstract

A challenge encountered with Landsat Thematic Mapper (TM) data, which includes data from size reflective spectral bands, is displaying as much information as possible in a three-image set for color compositing or digital analysis. Principal component analysis (PCA) applied to the six TM bands simultaneously is often used to address this problem. However, two problems that can be encountered using the PCA method are that information of interest might be mathematically mapped to one of the unused components and that a color composite can be difficult to interpret. "Selective' PCA can be used to minimize both of these problems. The spectral contrast among several spectral regions was mapped for a northern Arizona site using Landsat TM data. Field investigations determined that most of the spectral contrast seen in this area was due to one of the following: the amount of iron and hematite in the soils and rocks, vegetation differences, standing and running water, or the presence of gypsum, which has a higher moisture retention capability than do the surrounding soils and rocks. -from Authors

Original languageEnglish
Pages (from-to)339-348
Number of pages10
JournalPhotogrammetric Engineering & Remote Sensing
Volume55
Issue number3
Publication statusPublished - 1989

Fingerprint

Landsat thematic mapper
Principal component analysis
principal component analysis
Rocks
Color
Soils
Hematite
Gypsum
rock
hematite
gypsum
Moisture
soil
moisture
Iron
iron
vegetation
Composite materials
Water
water

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Earth and Planetary Sciences (miscellaneous)
  • Computers in Earth Sciences
  • Environmental Science(all)

Cite this

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AB - A challenge encountered with Landsat Thematic Mapper (TM) data, which includes data from size reflective spectral bands, is displaying as much information as possible in a three-image set for color compositing or digital analysis. Principal component analysis (PCA) applied to the six TM bands simultaneously is often used to address this problem. However, two problems that can be encountered using the PCA method are that information of interest might be mathematically mapped to one of the unused components and that a color composite can be difficult to interpret. "Selective' PCA can be used to minimize both of these problems. The spectral contrast among several spectral regions was mapped for a northern Arizona site using Landsat TM data. Field investigations determined that most of the spectral contrast seen in this area was due to one of the following: the amount of iron and hematite in the soils and rocks, vegetation differences, standing and running water, or the presence of gypsum, which has a higher moisture retention capability than do the surrounding soils and rocks. -from Authors

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