Index Catalog // ScholarsArchive@OSU

Creator:: Fickas, Kate C., Cohen, Warren B., and Yang, Zhiqiang
Abstract:: n Oregon’s Willamette Valley, remaining wetlands are at high risk to loss and degradation from agricultural activity and urbanization. With an increased need for fine temporal-scale monitoring of sensitive wetlands, we used annual Landsat MSS and TM/ETM+ images from 1972 to 2012 to manually interpret loss, gain, and type conversion...
Resource Type:: Article
Full Text:: Kate C. Fickas . Warren B. Cohen . Zhiqiang Yang Received: 14 May 2014 / Accepted: 28 July 2015

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

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

Creator:: Braaten, Justin D., Cohen, Warren B., and Yang, Zhiqiang
Abstract:: Automated cloud and cloud shadow identification algorithms designed for Landsat Thematic Mapper (TM) and Thematic Mapper Plus (ETM+) satellite images have greatly expanded the use of these Earth observation data by providing a means of including only clear-view pixels in image analysis and efficient cloud-free compositing. In an effort to...
Resource Type:: Article
Full Text:: Landsat MSS imagery for temperate ecosystems Justin D. Braaten a,⁎, Warren B. Cohen b, Zhiqiang Yang a a

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

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

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

Creator:: Sachs, Donald L., Sollins, Phillip, and Cohen, Warren B.
Abstract:: To consider the regional scale effects of forest management requires complete and consistent data over large areas. We used Landsat Thematic Mapper and Multispectral Scanner (TM and MSS) imagery to map forest cover and detect major disturbances between 1975 and 1992 for a 4.2 x 106 ha area of interior...
Resource Type:: Article
Full Text:: 1975 to 1992 using satellite imagery Donald L. Sachs, Phillip Sollins, and Warren B. Cohen Abstract

Creator:: Kennedy, Robert E., Andréfouët, Serge, Cohen, Warren B., Meigs, Garrett W., and et al.
Abstract:: When characterizing the processes that shape ecosystems, ecologists increasingly use the unique perspective offered by repeat observations of remotely sensed imagery. However, the concept of change embodied in much of the traditional remote-sensing literature was primarily limited to capturing large or extreme changes occurring in natural systems, omitting many more...

Creator:: Kennedy, Robert E., Andréfouët, Serge, Cohen, Warren B., Meigs, Garrett W., and et al.
Abstract:: When characterizing the processes that shape ecosystems, ecologists increasingly use the unique perspective offered by repeat observations of remotely sensed imagery. However, the concept of change embodied in much of the traditional remote-sensing literature was primarily limited to capturing large or extreme changes occurring in natural systems, omitting many more...
Full Text:: ., Andréfouët, S., Cohen, W. B., Gómez, C., Griffiths, P., Hais, M., ... & Zhu, Z. (2014). Bringing an

ScholarsArchive@OSU