Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska
Thesis (M.S.) University of Alaska Fairbanks, 2004 A variety of single-band, band ratio, vegetation index, and multivariate algorithms were evaluated for mapping burn severity using Landsat TM and ETM+ imagery across four burns in interior Alaska. The Normalized Burn Ratio (NBR) outperformed all alg...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/5952 2023-05-15T18:48:39+02:00 Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska Epting, Justin Frederick 2004-08 http://hdl.handle.net/11122/5952 en_US eng http://hdl.handle.net/11122/5952 Department of Forest Sciences Thesis ms 2004 ftunivalaska 2023-02-23T21:36:32Z Thesis (M.S.) University of Alaska Fairbanks, 2004 A variety of single-band, band ratio, vegetation index, and multivariate algorithms were evaluated for mapping burn severity using Landsat TM and ETM+ imagery across four burns in interior Alaska. The Normalized Burn Ratio (NBR) outperformed all algorithms, both when tested as a single post-fire value and when tested as a differenced (prefire-postfire) value. The NBR was then used to map burn severity at a historical burn near Yukon-Charley Rivers National Preserve and a time-series of images from 1986 to 2002 was analyzed to investigate interactions between vegetation, burn severity, and topography. Strong interactions existed between vegetation and burn severity, but the only topographic variable that had a significant relationship with burn severity was elevation, presumably due to the strong control of elevation on vegetation type. The highest burn severity occurred in spruce forest, while the lowest occurred in broadleaf forest. Areas with high burn severity experienced disproportionately more shifts toward spruce woodland and shrub classes, while areas with low to moderate severity were less likely to change vegetation type. Finally, vegetation recovery, estimated using a remotely-sensed vegetation index, peaked between 8-14 years post-fire, and recovery was highest for areas with the highest burn severity. Thesis Alaska Yukon University of Alaska: ScholarWorks@UA Fairbanks Yukon |
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University of Alaska: ScholarWorks@UA |
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ftunivalaska |
language |
English |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2004 A variety of single-band, band ratio, vegetation index, and multivariate algorithms were evaluated for mapping burn severity using Landsat TM and ETM+ imagery across four burns in interior Alaska. The Normalized Burn Ratio (NBR) outperformed all algorithms, both when tested as a single post-fire value and when tested as a differenced (prefire-postfire) value. The NBR was then used to map burn severity at a historical burn near Yukon-Charley Rivers National Preserve and a time-series of images from 1986 to 2002 was analyzed to investigate interactions between vegetation, burn severity, and topography. Strong interactions existed between vegetation and burn severity, but the only topographic variable that had a significant relationship with burn severity was elevation, presumably due to the strong control of elevation on vegetation type. The highest burn severity occurred in spruce forest, while the lowest occurred in broadleaf forest. Areas with high burn severity experienced disproportionately more shifts toward spruce woodland and shrub classes, while areas with low to moderate severity were less likely to change vegetation type. Finally, vegetation recovery, estimated using a remotely-sensed vegetation index, peaked between 8-14 years post-fire, and recovery was highest for areas with the highest burn severity. |
format |
Thesis |
author |
Epting, Justin Frederick |
spellingShingle |
Epting, Justin Frederick Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
author_facet |
Epting, Justin Frederick |
author_sort |
Epting, Justin Frederick |
title |
Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
title_short |
Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
title_full |
Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
title_fullStr |
Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
title_full_unstemmed |
Remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior Alaska |
title_sort |
remote sensing of burn severity and the interactions between burn severity, topography and vegetation in interior alaska |
publishDate |
2004 |
url |
http://hdl.handle.net/11122/5952 |
geographic |
Fairbanks Yukon |
geographic_facet |
Fairbanks Yukon |
genre |
Alaska Yukon |
genre_facet |
Alaska Yukon |
op_relation |
http://hdl.handle.net/11122/5952 Department of Forest Sciences |
_version_ |
1766241845671624704 |