Search Results - "KELLNER, R"

Biomass estimation from simulated GEDI, ICESat-2 and NISAR across environmental gradients in Sonoma County, California by Duncanson, Laura, Neuenschwander, Amy, Hancock, Steven, Thomas, Nathan, Fatoyinbo, Temilola, Simard, Marc, Silva, Carlos A., Armston, John, Luthcke, Scott B., Hofton, Michelle, Kellner, James R., Dubayah, Ralph

“…Estimates of the magnitude and distribution of aboveground carbon in Earth's forests remain uncertain, yet knowledge of forest carbon content at a global scale…”
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Poleward expansion of mangroves is a threshold response to decreased frequency of extreme cold events by Cavanaugh, Kyle C., Kellner, James R., Forde, Alexander J., Gruner, Daniel S., Parker, John D., Rodriguez, Wilfrid, Feller, Ilka C.

“…Regional warming associated with climate change is linked with altered range and abundance of species and ecosystems worldwide. However, the ecological impacts…”
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GEDI launches a new era of biomass inference from space by Dubayah, Ralph, Armston, John, Healey, Sean P, Bruening, Jamis M, Patterson, Paul L, Kellner, James R, Duncanson, Laura, Saarela, Svetlana, Ståhl, Göran, Yang, Zhiqiang, Tang, Hao, Blair, J Bryan, Fatoyinbo, Lola, Goetz, Scott, Hancock, Steven, Hansen, Matthew, Hofton, Michelle, Hurtt, George, Luthcke, Scott

“…Accurate estimation of aboveground forest biomass stocks is required to assess the impacts of land use changes such as deforestation and subsequent regrowth on…”
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Algorithm Theoretical Basis Document for GEDI Footprint Aboveground Biomass Density by Kellner, James R., Armston, John, Duncanson, Laura

“…The Global Ecosystem Dynamics Investigation (GEDI) lidar is a multibeam laser altimeter on the International Space Station (ISS). GEDI is the first spaceborne…”
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The GEDI Simulator: A Large‐Footprint Waveform Lidar Simulator for Calibration and Validation of Spaceborne Missions by Hancock, Steven, Armston, John, Hofton, Michelle, Sun, Xiaoli, Tang, Hao, Duncanson, Laura I., Kellner, James R., Dubayah, Ralph

“…NASA's Global Ecosystem Dynamics Investigation (GEDI) is a spaceborne lidar mission which will produce near global (51.6°S to 51.6°N) maps of forest structure…”
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Macrosystems ecology: understanding ecological patterns and processes at continental scales by Heffernan, James B, Soranno, Patricia A, Angilletta, Michael J, Buckley, Lauren B, Gruner, Daniel S, Keitt, Tim H, Kellner, James R, Kominoski, John S, Rocha, Adrian V, Xiao, Jingfeng, Harms, Tamara K, Goring, Simon J, Koenig, Lauren E, McDowell, William H, Powell, Heather, Richardson, Andrew D, Stow, Craig A, Vargas, Rodrigo, Weathers, Kathleen C

“…Macrosystems ecology is the study of diverse ecological phenomena at the scale of regions to continents and their interactions with phenomena at other scales…”
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Supervised Segmentation of Ultra-High-Density Drone Lidar for Large-Area Mapping of Individual Trees by Krůček, Martin, Král, Kamil, Cushman, KC, Missarov, Azim, Kellner, James R.

“…We applied a supervised individual-tree segmentation algorithm to ultra-high-density drone lidar in a temperate mountain forest in the southern Czech Republic…”
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Chlorophyll a fluorescence illuminates a path connecting plant molecular biology to Earth-system science by Porcar-Castell, Albert, Malenovský, Zbyněk, Magney, Troy, Van Wittenberghe, Shari, Fernández-Marín, Beatriz, Maignan, Fabienne, Zhang, Yongguang, Maseyk, Kadmiel, Atherton, Jon, Albert, Loren P., Robson, Thomas Matthew, Zhao, Feng, Garcia-Plazaola, Jose-Ignacio, Ensminger, Ingo, Rajewicz, Paulina A., Grebe, Steffen, Tikkanen, Mikko, Kellner, James R., Ihalainen, Janne A., Rascher, Uwe, Logan, Barry

“…For decades, the dynamic nature of chlorophyll a fluorescence (ChlaF) has provided insight into the biophysics and ecophysiology of the light reactions of…”
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Operational Tree Species Mapping in a Diverse Tropical Forest with Airborne Imaging Spectroscopy by Baldeck, Claire A, Asner, Gregory P, Martin, Robin E, Anderson, Christopher B, Knapp, David E, Kellner, James R, Wright, S Joseph

“…Remote identification and mapping of canopy tree species can contribute valuable information towards our understanding of ecosystem biodiversity and function…”
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Convergent structural responses of tropical forests to diverse disturbance regimes by Kellner, James R, Asner, Gregory P

“…Size frequency distributions of canopy gaps are a hallmark of forest dynamics. But it remains unknown whether legacies of forest disturbance are influencing…”
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Statistical properties of hybrid estimators proposed for GEDI-NASA's global ecosystem dynamics investigation by Patterson, Paul L, Healey, Sean P, Ståhl, Göran, Saarela, Svetlana, Holm, Sören, Andersen, Hans-Erik, Dubayah, Ralph O, Duncanson, Laura, Hancock, Steven, Armston, John, Kellner, James R, Cohen, Warren B, Yang, Zhiqiang

“…NASA's Global Ecosystem Dynamics Investigation (GEDI) mission will collect waveform lidar data at a dense sample of ∼25 m footprints along ground tracks…”
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Bruchpilot Promotes Active Zone Assembly, Ca²⁺ Channel Clustering, and Vesicle Release by Kittel, Robert J, Wichmann, Carolin, Rasse, Tobias M, Fouquet, Wernher, Schmidt, Manuela, Schmid, Andreas, Wagh, Dhananjay A, Pawlu, Christian, Kellner, Robert R, Willig, Katrin I, Hell, Stefan W, Buchner, Erich, Heckmann, Manfred, Sigrist, Stephan J

“…The molecular organization of presynaptic active zones during calcium influx-triggered neurotransmitter release is the focus of intense investigation. The…”
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Forest canopy gap distributions in the southern Peruvian Amazon by Asner, Gregory P, Kellner, James R, Kennedy-Bowdoin, Ty, Knapp, David E, Anderson, Christopher, Martin, Roberta E

“…Canopy gaps express the time-integrated effects of tree failure and mortality as well as regrowth and succession in tropical forests. Quantifying the size and…”
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Near-Complete Sampling of Forest Structure from High-Density Drone Lidar Demonstrated by Ray Tracing by Zhang, Dafeng, Král, Kamil, Krůček, Martin, Cushman, K. C., Kellner, James R.

“…Drone lidar has the potential to provide detailed measurements of vertical forest structure throughout large areas, but a systematic evaluation of unsampled…”
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Diversity, distribution and dynamics of large trees across an old-growth lowland tropical rain forest landscape by Clark, David B, Ferraz, Antonio, Clark, Deborah A, Kellner, James R, Letcher, Susan G, Saatchi, Sassan

“…Large trees, here defined as ≥60 cm trunk diameter, are the most massive organisms in tropical rain forest, and are important in forest structure, dynamics and…”
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Impact of leaf phenology on estimates of aboveground biomass density in a deciduous broadleaf forest from simulated GEDI lidar by Cushman, K C, Armston, John, Dubayah, Ralph, Duncanson, Laura, Hancock, Steven, Janík, David, Král, Kamil, Krůček, Martin, Minor, David M, Tang, Hao, Kellner, James R

“…Abstract The Global Ecosystem Dynamics Investigation (GEDI) is a waveform lidar instrument on the International Space Station used to estimate aboveground…”
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Accurate Quantification of 0–30 cm Soil Organic Carbon in Croplands over the Continental United States Using Machine Learning by Fu, Peng, Clanton, Christian, Demuth, Kirk M., Goodman, Verena, Griffith, Lauren, Khim-Young, Mage, Maddalena, Julia, LaMarca, Kenny, Wright, Logan A., Schurman, David W., Kellner, James R.

“…Increases in organic carbon within agricultural soils are widely recognized as a “negative emission” that removes CO2 from the atmosphere. Accurate…”
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Impact of a tropical forest blowdown on aboveground carbon balance by Cushman, K. C., Burley, John T., Imbach, Benedikt, Saatchi, Sassan S., Silva, Carlos E., Vargas, Orlando, Zgraggen, Carlo, Kellner, James R.

“…Field measurements demonstrate a carbon sink in the Amazon and Congo basins, but the cause of this sink is uncertain. One possibility is that forest landscapes…”
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Tropical forest biomass estimation and the fallacy of misplaced concreteness by Clark, David B., Kellner, James R.

“…Despite the importance of measuring tropical forest biomass, the accuracy of biomass estimates is poorly constrained due to fundamental weaknesses in the…”
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Low mortality in tall tropical trees by Thomas, R. Q, Kellner, J. R, Clark, D. B, Peart, D. R

“…The dynamics of the tallest trees in tropical forests are of special interest due to their carbon content, canopy dominance, and the large canopy gaps created…”
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