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United States Forest Disturbance Trends Observed Using Landsat Time Series

Creator:: Masek, Jeffrey G., Goward, Samuel N., Kennedy, Robert E., Cohen, Warren B., Moisen, Gretchen G., Schleeweis, Karen, and Huang, Chengquan
Abstract:: Disturbance events strongly affect the composition, structure, and function of forest ecosystems; however, existing US land management inventories were not designed to monitor disturbance. To begin addressing this gap, the North American Forest Dynamics (NAFD) project has examined a geographic sample of 50 Landsat satellite image time series to assess...
Resource Type:: Article
Full Text:: Using Landsat Time Series Jeffrey G. Masek,1* Samuel N. Goward,2 Robert E. Kennedy,3,4 Warren B. Cohen

Forest disturbance across the conterminous United States from 1985-2012: The emerging dominance of forest decline

Creator:: Cohen, Warren B., Yang, Zhiqiang, Stehman, Stephen V., Schroeder, Todd A., Bell, David M., Masek, Jeffrey G., Huang, Chengquan, and Meigs, Garrett W.
Abstract:: Evidence of shifting dominance among major forest disturbance agent classes regionally to globally has been emerging in the literature. For example, climate-related stress and secondary stressors on forests (e.g., insect and disease, fire) have dramatically increased since the turn of the century globally, while harvest rates in the western US...
Resource Type:: Article
Full Text:: ,⇑, Zhiqiang Yang b, Stephen V. Stehman c, Todd A. Schroeder d,1, David M. Bell a, Jeffrey G. Masek e

Prediction of understory vegetation cover with airborne lidar in an interior ponderosa pine forest

Creator:: Wing, Brian M., Ritchie, Martin W., Boston, Kevin, Cohen, Warren B., Gitelman, Alix, and Olsen, Michael J.
Abstract:: Forest understory communities are important components in forest ecosystems providing wildlife habitat and influencing nutrient cycling, fuel loadings, fire behavior and tree species composition over time. One of the most widely utilized understory component metrics is understory vegetation cover, often used as a measure of vegetation abundance. To date, understory...
Resource Type:: Article
Full Text:: airborne lidar in an interior ponderosa pine forest Brian M. Wing a,⁎, Martin W. Ritchie b, Kevin Boston a

A forest vulnerability index based on drought and high temperatures

Creator:: Mildrexler, David, Yang, Zhiqiang, Cohen, Warren B., and Bell, David M.
Abstract:: Increasing forest stress and tree mortality has been directly linked to combinations of drought and high temperatures. The climatic changes expected during the next decades – large increases in mean temperature, increased heat waves, and significant long-term regional drying in the western USA – will likely increase chronic forest stress...
Resource Type:: Article
Full Text:: , Warren B. Cohen b, David M. Bell b a Oregon State University, College of Forestry, Corvallis, OR, USA b

Individual snag detection using neighborhood attribute filtered airborne lidar data

Creator:: Wing, Brian M., Ritchie, Martin W., Boston, Kevin, Cohen, Warren B., and Olsen, Michael J.
Abstract:: The ability to estimate and monitor standing dead trees (snags) has been difficult due to their irregular and sparse distribution, often requiring intensive sampling methods to obtain statistically significant estimates. This study presents a new method for estimating and monitoring snags using neighborhood attribute filtered airborne discrete-return lidar data. The...
Resource Type:: Article
Full Text:: airborne lidar data Brian M. Wing a,⁎, Martin W. Ritchie a, Kevin Boston b, Warren B. Cohen c, Michael J

Assessing the Carbon Consequences of Western Juniper (Juniperus occidentalis) Encroachment Across Oregon, USA

Creator:: Campbell, John L., Kennedy, Robert E., Cohen, Warren B., and Miller, Richard F.
Abstract:: Our ability to assess the continental impacts of woody encroachment remains compromised by the paucity of studies quantifying regional encroachment rates. This knowledge gap is especially apparent when it comes to quantifying the impact of woody encroachment on large-scale carbon dynamics. In this study, we use a combination of aerial...
Resource Type:: Article
Full Text:: occidentalis) Encroachment Across Oregon, USA John L. Campbell,1 Robert E. Kennedy,2 Warren B. Cohen,3 and

Mapping post-fire habitat characteristics through the fusion of remote sensing tools

Creator:: Vogeler, Jody C., Yang, Zhiqiang, and Cohen, Warren B.
Abstract:: Post-fire snags provide important resources for cavity nesting communities as well as being subject to timber removal through salvage logging practices. Tools that can characterize their distributions along with other features important as wildlife habitat, such as woody shrub cover, would be useful for research and management purposes. Three dimensional...
Resource Type:: Article
Full Text:: tools Jody C. Vogeler a,⁎, Zhiqiang Yang a, Warren B. Cohen a,b a Department of Forest Ecosystems and

A Landsat time series approach to characterize bark beetle and defoliator impacts on tree mortality and surface fuels in conifer forests

Creator:: Meigs, Garrett W., Kennedy, Robert E., and Cohen, Warren B.
Abstract:: Insects are important forest disturbance agents, and mapping their effects on tree mortality and surface fuels represents a critical research challenge. Although various remote sensing approaches have been developed to monitor insect impacts, most studies have focused on single insect agents or single locations and have not related observed changes...
Resource Type:: Article
Full Text:: ,⁎, Robert E. Kennedy a, Warren B. Cohen b a Department of Forest Ecosystems and Society, Oregon State

Using Landsat-derived disturbance history (1972–2010) to predict current forest structure

Creator:: Pflugmacher, Dirk, Cohen, Warren B., and Kennedy, Robert E.
Abstract:: Lidar is currently the most accurate method for remote estimation of forest structure, but it has limited spatial and temporal coverage. Conversely, Landsat data are more widely available, but exhibit a weaker relationship with structure under medium to high leaf area conditions. One potentially valuable means of enhancing the relationship...
Resource Type:: Article
Full Text:: Pflugmacher a,⁎, Warren B. Cohen b, Robert E. Kennedy a a Department of Forest Ecosystems and Society, Oregon

Using Landsat-derived disturbance and recovery history and lidar to map forest biomass dynamics

Creator:: Pflugmacher, Dirk, Cohen, Warren B., Kennedy, Robert E., and Yang, Zhiqiang
Abstract:: Improved monitoring of forest biomass and biomass change is needed to quantify natural and anthropogenic effects on the terrestrial carbon cycle. Landsat's temporal and spatial coverage, moderate spatial resolution, and long history of earth observations provide a unique opportunity for characterizing vegetation changes across large areas and long time scales....
Resource Type:: Article
Full Text:: recovery history and lidar tomap forest biomass dynamics Dirk Pflugmacher a,⁎, Warren B. Cohen b, Robert E

ScholarsArchive@OSU

United States Forest Disturbance Trends Observed Using Landsat Time Series

Forest disturbance across the conterminous United States from 1985-2012: The emerging dominance of forest decline

Prediction of understory vegetation cover with airborne lidar in an interior ponderosa pine forest

A forest vulnerability index based on drought and high temperatures

Individual snag detection using neighborhood attribute filtered airborne lidar data

Assessing the Carbon Consequences of Western Juniper (Juniperus occidentalis) Encroachment Across Oregon, USA

Mapping post-fire habitat characteristics through the fusion of remote sensing tools

A Landsat time series approach to characterize bark beetle and defoliator impacts on tree mortality and surface fuels in conifer forests

Using Landsat-derived disturbance history (1972–2010) to predict current forest structure

Using Landsat-derived disturbance and recovery history and lidar to map forest biomass dynamics

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