Zhiliang Zhu, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 94
Public Review Draft: A Method for Assessing Carbon Stocks, Carbon Sequestration, and Greenhouse-Gas Fluxes in Ecosystems of the United States Under Present Conditions and Future Scenarios Public Review Draft: A Method for Assessing Carbon Stocks, Carbon Sequestration, and Greenhouse-Gas Fluxes in Ecosystems of the United States Under Present Conditions and Future Scenarios
The Energy Independence and Security Act of 2007 (EISA), Section 712, authorizes the U.S. Department of the Interior to develop a methodology and conduct an assessment of the Nation's ecosystems focusing on carbon stocks, carbon sequestration, and emissions of three greenhouse gases (GHGs): carbon dioxide, methane, and nitrous oxide. The major requirements include (1) an assessment of...
Authors
Brian A. Bergamaschi, Richard Bernknopf, David Clow, Dennis Dye, Stephen Faulkner, William Forney, Robert Gleason, Todd Hawbaker, Jinxun Liu, Shu-Guang Liu, Stephen Prisley, Bradley Reed, Matthew Reeves, Matthew Rollins, Benjamin Sleeter, Terry Sohl, Sarah Stackpoole, Stephen Stehman, Robert G. Striegl, Anne Wein, Zhi-Liang Zhu
Automated masking of cloud and cloud shadow for forest change analysis using Landsat images Automated masking of cloud and cloud shadow for forest change analysis using Landsat images
Accurate masking of cloud and cloud shadow is a prerequisite for reliable mapping of land surface attributes. Cloud contamination is particularly a problem for land cover change analysis, because unflagged clouds may be mapped as false changes, and the level of such false changes can be comparable to or many times more than that of actual changes, even for images with small percentages...
Authors
Chengquan Huang, Nancy Thomas, Samuel N. Goward, Jeffery G. Masek, Zhiliang Zhu, J.R.G. Townshend, James Vogelmann
A spectral index for estimating soil salinity in the Yellow River Delta region of China using EO-1 Hyperion data A spectral index for estimating soil salinity in the Yellow River Delta region of China using EO-1 Hyperion data
Soil salinization is one of the most common land degradation processes. In this study, spectral measurements of saline soil samples collected from the Yellow River Delta region of China were conducted in laboratory and hyperspectral data were acquired from an EO-1 Hyperion sensor to quantitatively map soil salinity in the region. A soil salinity spectral index (SSI) was constructed from...
Authors
Yongling Weng, Peng Gong, Zhiliang Zhu
Comparing forest fragmentation and its drivers in China and the USA with Globcover v2.2 Comparing forest fragmentation and its drivers in China and the USA with Globcover v2.2
Forest loss and fragmentation are of major concern to the international community, in large part because they impact so many important environmental processes. The main objective of this study was to assess the differences in forest fragmentation patterns and drivers between China and the conterminous United States (USA). Using the latest 300-m resolution global land cover product...
Authors
Mingshi Chen, Lijun Mao, Chunguo Zhou, James E. Vogelmann, Zhiliang Zhu
U.S. Geological Survey Methodology Development for Ecological Carbon Assessment and Monitoring U.S. Geological Survey Methodology Development for Ecological Carbon Assessment and Monitoring
Ecological carbon sequestration refers to transfer and storage of atmospheric carbon in vegetation, soils, and aquatic environments to help offset the net increase from carbon emissions. Understanding capacities, associated opportunities, and risks of vegetated ecosystems to sequester carbon provides science information to support formulation of policies governing climate change...
Authors
Zhi-Liang Zhu, S.M. Stackpoole
An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks
A highly automated algorithm called vegetation change tracker (VCT) has been developed for reconstructing recent forest disturbance history using Landsat time series stacks (LTSS). This algorithm is based on the spectral–temporal properties of land cover and forest change processes, and requires little or no fine tuning for most forests with closed or near close canopy cover. It was...
Authors
Chengquan Huang, Samuel N. Goward, Jeffery G. Masek, Nancy Thomas, Zhiliang Zhu, James Vogelmann
Science and Products
Filter Total Items: 94
Public Review Draft: A Method for Assessing Carbon Stocks, Carbon Sequestration, and Greenhouse-Gas Fluxes in Ecosystems of the United States Under Present Conditions and Future Scenarios Public Review Draft: A Method for Assessing Carbon Stocks, Carbon Sequestration, and Greenhouse-Gas Fluxes in Ecosystems of the United States Under Present Conditions and Future Scenarios
The Energy Independence and Security Act of 2007 (EISA), Section 712, authorizes the U.S. Department of the Interior to develop a methodology and conduct an assessment of the Nation's ecosystems focusing on carbon stocks, carbon sequestration, and emissions of three greenhouse gases (GHGs): carbon dioxide, methane, and nitrous oxide. The major requirements include (1) an assessment of...
Authors
Brian A. Bergamaschi, Richard Bernknopf, David Clow, Dennis Dye, Stephen Faulkner, William Forney, Robert Gleason, Todd Hawbaker, Jinxun Liu, Shu-Guang Liu, Stephen Prisley, Bradley Reed, Matthew Reeves, Matthew Rollins, Benjamin Sleeter, Terry Sohl, Sarah Stackpoole, Stephen Stehman, Robert G. Striegl, Anne Wein, Zhi-Liang Zhu
Automated masking of cloud and cloud shadow for forest change analysis using Landsat images Automated masking of cloud and cloud shadow for forest change analysis using Landsat images
Accurate masking of cloud and cloud shadow is a prerequisite for reliable mapping of land surface attributes. Cloud contamination is particularly a problem for land cover change analysis, because unflagged clouds may be mapped as false changes, and the level of such false changes can be comparable to or many times more than that of actual changes, even for images with small percentages...
Authors
Chengquan Huang, Nancy Thomas, Samuel N. Goward, Jeffery G. Masek, Zhiliang Zhu, J.R.G. Townshend, James Vogelmann
A spectral index for estimating soil salinity in the Yellow River Delta region of China using EO-1 Hyperion data A spectral index for estimating soil salinity in the Yellow River Delta region of China using EO-1 Hyperion data
Soil salinization is one of the most common land degradation processes. In this study, spectral measurements of saline soil samples collected from the Yellow River Delta region of China were conducted in laboratory and hyperspectral data were acquired from an EO-1 Hyperion sensor to quantitatively map soil salinity in the region. A soil salinity spectral index (SSI) was constructed from...
Authors
Yongling Weng, Peng Gong, Zhiliang Zhu
Comparing forest fragmentation and its drivers in China and the USA with Globcover v2.2 Comparing forest fragmentation and its drivers in China and the USA with Globcover v2.2
Forest loss and fragmentation are of major concern to the international community, in large part because they impact so many important environmental processes. The main objective of this study was to assess the differences in forest fragmentation patterns and drivers between China and the conterminous United States (USA). Using the latest 300-m resolution global land cover product...
Authors
Mingshi Chen, Lijun Mao, Chunguo Zhou, James E. Vogelmann, Zhiliang Zhu
U.S. Geological Survey Methodology Development for Ecological Carbon Assessment and Monitoring U.S. Geological Survey Methodology Development for Ecological Carbon Assessment and Monitoring
Ecological carbon sequestration refers to transfer and storage of atmospheric carbon in vegetation, soils, and aquatic environments to help offset the net increase from carbon emissions. Understanding capacities, associated opportunities, and risks of vegetated ecosystems to sequester carbon provides science information to support formulation of policies governing climate change...
Authors
Zhi-Liang Zhu, S.M. Stackpoole
An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks
A highly automated algorithm called vegetation change tracker (VCT) has been developed for reconstructing recent forest disturbance history using Landsat time series stacks (LTSS). This algorithm is based on the spectral–temporal properties of land cover and forest change processes, and requires little or no fine tuning for most forests with closed or near close canopy cover. It was...
Authors
Chengquan Huang, Samuel N. Goward, Jeffery G. Masek, Nancy Thomas, Zhiliang Zhu, James Vogelmann