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Remote sensing and landslide hazard assessmentRemotely acquired multispectral data are used to improve landslide hazard assessments at all scales of investigation. A vegetation map produced from automated interpretation of TM data is used in a GIS context to explore the effect of vegetation type on debris flow occurrence in preparation for inclusion in debris flow hazard modeling. Spectral vegetation indices map spatial patterns of grass senescence which are found to be correlated with soil thickness variations on hillslopes. Grassland senescence is delayed over deeper, wetter soils that are likely debris flow source areas. Prediction of actual soil depths using vegetation indices may be possible up to some limiting depth greater than the grass rooting zone. On forested earthflows, the slow slide movement disrupts the overhead timber canopy, exposes understory vegetation and soils, and alters site spectral characteristics. Both spectral and textural measures from broad band multispectral data are successful at detecting an earthflow within an undisturbed old-growth forest.
Document ID
19910065934
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mckean, J.
(USDA, Forest Service, Pleasant Hill CA, United States)
Buechel, S.
(NASA Ames Research Center; TGS Technology, Inc. Moffett Field, CA, United States)
Gaydos, L.
(NASA Ames Research Center; USGS Moffett Field, CA, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: Photogrammetric Engineering and Remote Sensing
Volume: 57
ISSN: 0099-1112
Subject Category
Earth Resources And Remote Sensing
Accession Number
91A50557
Distribution Limits
Public
Copyright
Other

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