Search Results - "Cohen, W.B."

Object-based semi-automatic approach for forest structure characterization using lidar data in heterogeneous Pinus sylvestris stands by Pascual, C., García-Abril, A., García-Montero, L.G., Martín-Fernández, S., Cohen, W.B.

“…In this paper, we present a two-stage approach for characterizing the structure of Pinus sylvestris L. stands in forests of central Spain. The first stage was…”
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Lidar Remote Sensing of the Canopy Structure and Biophysical Properties of Douglas-Fir Western Hemlock Forests by Lefsky, M.A., Cohen, W.B., Acker, S.A., Parker, G.G., Spies, T.A., Harding, D.

“…Scanning lidar remote sensing systems have recently become available for use in ecological applications. Unlike conventional microwave and optical sensors,…”
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MODIS land cover and LAI collection 4 product quality across nine sites in the western hemisphere by Cohen, W.B., Maiersperger, T.K., Turner, D.P., Ritts, W.D., Pflugmacher, D., Kennedy, R.E., Kirschbaum, A., Running, S.W., Costa, M., Gower, S.T.

“…Global maps of land cover and leaf area index (LAI) derived from the Moderate Resolution Imaging Spectrometer (MODIS) reflectance data are an important…”
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Surface Lidar Remote Sensing of Basal Area and Biomass in Deciduous Forests of Eastern Maryland, USA by Lefsky, Michael A, Harding, D, Cohen, W.B, Parker, G, Shugart, H.H

“…A method of predicting two forest stand structure attributes, basal area and aboveground biomass, from measurements of forest vertical structure was developed…”
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Landsat-8: Science and product vision for terrestrial global change research by Roy, D. P, Wulder, M. A, Loveland, T. R, Woodcock, C. E, Allen, R. G, Anderson, M. C, Helder, D, Irons, J. R, Johnson, D. M, Kennedy, R, Scambos, T. A, Schaaf, C. B, Schott, J. R, Sheng, Y, Vermote, E. F, Belward, A. S, Bindschadler, R, Cohen, W. B, Gao, F, Hipple, J. D, Hostert, P, Huntington, J, Justice, C. O, Kilic, A, Kovalskyy, V, Lee, Z. P, Lymburner, L, Masek, J. G, McCorkel, J, Shuai, Y, Trezza, R, Vogelmann, J, Wynne, R. H, Zhu, Z

“…Landsat 8, a NASA and USGS collaboration, acquires global moderate-resolution measurements of the Earth's terrestrial and polar regions in the visible,…”
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Short-term climate trends and the Swiss needle cast epidemic in Oregon’s public and private coastal forestlands by Mildrexler, David J., Shaw, D.C., Cohen, W.B.

“…•Short-term climate trends can change foliage disease occurrence.•Swiss Needle Cast (SNC) symptoms are primarily in young plantation forests.•Effect of climate…”
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Landsat's Role in Ecological Applications of Remote Sensing by COHEN, WARREN B, GOWARD, SAMUEL N

“…Remote sensing, geographic information systems, and modeling have combined to produce a virtual explosion of growth in ecological investigations and…”
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Validation of global moderate-resolution LAI products: a framework proposed within the CEOS land product validation subgroup by Morisette, J.T., Baret, F., Privette, J.L., Myneni, R.B., Nickeson, J.E., Garrigues, S., Shabanov, N.V., Weiss, M., Fernandes, R.A., Leblanc, S.G., Kalacska, M., Sanchez-Azofeifa, G.A., Chubey, M., Rivard, B., Stenberg, P., Rautiainen, M., Voipio, P., Manninen, T., Pilant, A.N., Lewis, T.E., Iiames, J.S., Colombo, R., Meroni, M., Busetto, L., Cohen, W.B., Turner, D.P., Warner, E.D., Petersen, G.W., Seufert, G., Cook, R.

“…Initiated in 1984, the Committee Earth Observing Satellites' Working Group on Calibration and Validation (CEOS WGCV) pursues activities to coordinate,…”
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Disturbance and climate effects on carbon stocks and fluxes across Western Oregon USA by Law, B.E, Turner, D, Campbell, J, Sun, O.J, Van Tuyl, S, Ritts, W.D, Cohen, W.B

“…We used a spatially nested hierarchy of field and remote-sensing observations and a process model, Biome-BGC, to produce a carbon budget for the forested…”
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Patterns of forest regrowth following clearcutting in western Oregon as determined from a Landsat time-series by Schroeder, Todd A., Cohen, Warren B., Yang, Zhiqiang

“…The rate at which forest vegetation re-establishes dominance after clearcut harvesting can impact many ecological processes, such as erosion/sedimentation,…”
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Combining lidar estimates of aboveground biomass and Landsat estimates of stand age for spatially extensive validation of modeled forest productivity by Lefsky, M.A., Turner, D.P., Guzy, M., Cohen, W.B.

“…Extensive estimates of forest productivity are required to understand the relationships between shifting land use, changing climate and carbon storage and…”
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Characterizing 23 years (1972-95) of stand replacement disturbance in western Oregon forests with landsat imagery by Cohen, W.B, Spies, T.A, Alig, R.J, Oetter, D.R, Maiersperger, T.K, Fiorella, M

“…In western Oregon, forest ecosystem processes are greatly affected by patterns of stand replacement disturbance. A spatially explicit characterization of…”
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Key issues in making and using satellite-based maps in ecology: A primer by Fassnacht, Karin S., Cohen, Warren B., Spies, Thomas A.

“…The widespread availability of satellite imagery and image processing software has made it relatively easy for ecologists to use satellite imagery to address…”
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Two decades of carbon flux from forests of the Pacific Northwest: estimates from a new modeling strategy by Cohen, W.B, Harmon, M.E, Wallin, D.O, Fiorella, M

“…Better techniques for modeling terrestrial carbon fluxes are being developed. These models can determine the maximal live and detrital biomass accumulation and…”
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Two Decades of Carbon Flux from Forests of the Pacific Northwest by Cohen, Warren B., Harmon, Mark E., Wallin, David O., Fiorella, Maria

“…Cohen et al describe their strategy for estimating carbon fluxes, which involves a collection of forest ecosystem and related models largely driven by Landsat…”
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Empirical methods to compensate for a view-angle-dependent brightness gradient in AVIRIS imagery by Kennedy, Robert E., Cohen, Warren B., Takao, Gen

“…A view-angle-dependent brightness gradient was observed in an AVIRIS image of a forested region in Oregon's Cascade Mountains. A method of removing the…”
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An introduction to digital methods in remote sensing of forested ecosystems: focus on the Pacific Northwest, USA by Cohen, WB, Kushla, JD, Ripple, WJ, Garman, SL

“…Aerial photography has been routinely used for several decades by natural resource scientists and managers to map and monitor the condition of forested…”
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A portable stereoscopic field viewer for prints or transparencies [Remote sensing forestry] by Cohen W.B, Ashley M.D

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Lidar remote sensing of forest canopy structure and related biophysical parameters at H.J. Andrews Experimental Forest, Oregon, USA by Lefsky, M.A., Cohen, W.B., Acker, S.A., Spies, T.A., Parker, G.G., Harding, D.

“…Scanning lidar remote sensing systems have become generally available for use in ecological applications. Unlike microwave and conventional optical sensors,…”
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Modeling the Effect of Land Use on Carbon Storage in the Forests of the Pacific Northwest by Cohen, W.B., Wallin, D.O., Harmon, M.E., Sollins, P., Daly, C., Ferrel, W.K.

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