Zhiliang Zhu, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 96
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
Development of time series stacks of Landsat images for reconstructing forest disturbance history Development of time series stacks of Landsat images for reconstructing forest disturbance history
Forest dynamics is highly relevant to a broad range of earth science studies, many of which have geographic coverage ranging from regional to global scales. While the temporally dense Landsat acquisitions available in many regions provide a unique opportunity for understanding forest disturbance history dating back to 1972, large quantities of Landsat images will need to be analysed for...
Authors
C. Huang, Samuel N. Goward, Jeffery G. Masek, Feng Gao, E. F. Vermote, Karen Schleeweis, Robert E. Kennedy, Zhiliang Zhu, Jeffery C. Eidenshink, J.R.G. Townshend
Assessing rates of forest change and fragmentation in Alabama, USA, using the vegetation change tracker model Assessing rates of forest change and fragmentation in Alabama, USA, using the vegetation change tracker model
Forest change is of great concern for land use decision makers and conservation communities. Quantitative and spatial forest change information is critical for addressing many pressing issues, including global climate change, carbon budgets, and sustainability. In this study, our analysis focuses on the differences in geospatial patterns and their changes between federal forests and...
Authors
Mingshi Li, Chengquan Huang, Zhiliang Zhu, Hua Shi, Heng Lu, Shikui Peng
Monitoring forest changes in the southwestern United States using multitemporal Landsat data Monitoring forest changes in the southwestern United States using multitemporal Landsat data
Landsat time series data sets were acquired for the Santa Fe National Forest in New Mexico. This area includes the San Pedro Parks Wilderness area, which was designated as an official wilderness in 1964. Eight autumnal Landsat Thematic Mapper (TM) scenes acquired from 1988 to 2006 were analyzed to determine whether significant changes have occurred throughout the region during the past...
Authors
James E. Vogelmann, Brian L. Tolk, Zhiliang Zhu
Soil sail content estimation in the Yellow River delta with satellite hyperspectral data Soil sail content estimation in the Yellow River delta with satellite hyperspectral data
Soil salinization is one of the most common land degradation processes and is a severe environmental hazard. The primary objective of this study is to investigate the potential of predicting salt content in soils with hyperspectral data acquired with EO-1 Hyperion. Both partial least-squares regression (PLSR) and conventional multiple linear regression (MLR), such as stepwise regression...
Authors
Yongling Weng, Peng Gong, Zhi-Liang Zhu
Using simulated historical time series to prioritize fuel treatments on landscapes across the United States: The LANDFIRE prototype project Using simulated historical time series to prioritize fuel treatments on landscapes across the United States: The LANDFIRE prototype project
Canopy and surface fuels in many fire-prone forests of the United States have increased over the last 70 years as a result of modern fire exclusion policies, grazing, and other land management activities. The Healthy Forest Restoration Act and National Fire Plan establish a national commitment to reduce fire hazard and restore fire-adapted ecosystems across the USA. The primary index...
Authors
Robert E. Keane, Matthew Rollins, Zhi-Liang Zhu
An estimate of carbon emissions from 2004 wildfires across Alaskan Yukon River Basin An estimate of carbon emissions from 2004 wildfires across Alaskan Yukon River Basin
Background Wildfires are an increasingly important component of the forces that drive the global carbon (C) cycle and climate change as progressive warming is expected in boreal areas. This study estimated C emissions from the wildfires across the Alaskan Yukon River Basin in 2004. We spatially related the firescars to land cover types and defined the C fractions of aboveground biomass...
Authors
Zhengxi Tan, Larry L. Tieszen, Zhiliang Zhu, Shuguang Liu, Stephen M. Howard
Mapping existing vegetation composition and structure for the LANDFIRE Prototype Project Mapping existing vegetation composition and structure for the LANDFIRE Prototype Project
The Landscape Fire and Resource Management Planning Tools Prototype Project, or LANDFIRE Prototype Project, required the mapping of existing vegetation composition (cover type) and structural stages at a 30-m spatial resolution to provide baseline vegetation data for the development of wildland fuel maps and for comparison to simulated historical vegetation reference conditions to...
Authors
Zhiliang Zhu, James Vogelmann, Donald O. Ohlen, Jay R. Kost, Xuexia Chen, Brian L. Tolk
An overview of the LANDFIRE Prototype Project An overview of the LANDFIRE Prototype Project
This chapter describes the background and design of the Landscape Fire and Resource Management Planning Tools Prototype Project, or LANDFIRE Prototype Project, which was a sub-regional, proof-of-concept effort designed to develop methods and applications for providing the high-resolution data (30-m pixel) needed to support wildland fire management and to implement the National Fire Plan...
Authors
Robert E. Keane, Zhiliang Zhu, James P. Menakis
Executive summary Executive summary
Geospatial data describing wildland fuel and current as well as historical vegetation conditions are essential for planning, implementing, and monitoring projects supported by the National Fire Plan and the Healthy Forests Restoration Act. Scientifically credible, consistent, and standardized spatial data allow fire and land managers to accurately identify the amount and locations of...
Authors
Matthew G. Rollins, Robert E. Keane, Zhiliang Zhu
Perspectives on LANDFIRE Prototype Project accuracy assessment Perspectives on LANDFIRE Prototype Project accuracy assessment
The purpose of this chapter is to provide a general overview of the many aspects of accuracy assessment pertinent to the Landscape Fire and Resource Management Planning Tools Prototype Project (LANDFIRE Prototype Project). The LANDFIRE Prototype formed a large and complex research and development project with many broad-scale data sets and products developed throughout its various stages...
Authors
James Vogelmann, Zhiliang Zhu, Jay R. Kost, Brian L. Tolk, Donald O. Ohlen
Science and Products
Filter Total Items: 96
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
Development of time series stacks of Landsat images for reconstructing forest disturbance history Development of time series stacks of Landsat images for reconstructing forest disturbance history
Forest dynamics is highly relevant to a broad range of earth science studies, many of which have geographic coverage ranging from regional to global scales. While the temporally dense Landsat acquisitions available in many regions provide a unique opportunity for understanding forest disturbance history dating back to 1972, large quantities of Landsat images will need to be analysed for...
Authors
C. Huang, Samuel N. Goward, Jeffery G. Masek, Feng Gao, E. F. Vermote, Karen Schleeweis, Robert E. Kennedy, Zhiliang Zhu, Jeffery C. Eidenshink, J.R.G. Townshend
Assessing rates of forest change and fragmentation in Alabama, USA, using the vegetation change tracker model Assessing rates of forest change and fragmentation in Alabama, USA, using the vegetation change tracker model
Forest change is of great concern for land use decision makers and conservation communities. Quantitative and spatial forest change information is critical for addressing many pressing issues, including global climate change, carbon budgets, and sustainability. In this study, our analysis focuses on the differences in geospatial patterns and their changes between federal forests and...
Authors
Mingshi Li, Chengquan Huang, Zhiliang Zhu, Hua Shi, Heng Lu, Shikui Peng
Monitoring forest changes in the southwestern United States using multitemporal Landsat data Monitoring forest changes in the southwestern United States using multitemporal Landsat data
Landsat time series data sets were acquired for the Santa Fe National Forest in New Mexico. This area includes the San Pedro Parks Wilderness area, which was designated as an official wilderness in 1964. Eight autumnal Landsat Thematic Mapper (TM) scenes acquired from 1988 to 2006 were analyzed to determine whether significant changes have occurred throughout the region during the past...
Authors
James E. Vogelmann, Brian L. Tolk, Zhiliang Zhu
Soil sail content estimation in the Yellow River delta with satellite hyperspectral data Soil sail content estimation in the Yellow River delta with satellite hyperspectral data
Soil salinization is one of the most common land degradation processes and is a severe environmental hazard. The primary objective of this study is to investigate the potential of predicting salt content in soils with hyperspectral data acquired with EO-1 Hyperion. Both partial least-squares regression (PLSR) and conventional multiple linear regression (MLR), such as stepwise regression...
Authors
Yongling Weng, Peng Gong, Zhi-Liang Zhu
Using simulated historical time series to prioritize fuel treatments on landscapes across the United States: The LANDFIRE prototype project Using simulated historical time series to prioritize fuel treatments on landscapes across the United States: The LANDFIRE prototype project
Canopy and surface fuels in many fire-prone forests of the United States have increased over the last 70 years as a result of modern fire exclusion policies, grazing, and other land management activities. The Healthy Forest Restoration Act and National Fire Plan establish a national commitment to reduce fire hazard and restore fire-adapted ecosystems across the USA. The primary index...
Authors
Robert E. Keane, Matthew Rollins, Zhi-Liang Zhu
An estimate of carbon emissions from 2004 wildfires across Alaskan Yukon River Basin An estimate of carbon emissions from 2004 wildfires across Alaskan Yukon River Basin
Background Wildfires are an increasingly important component of the forces that drive the global carbon (C) cycle and climate change as progressive warming is expected in boreal areas. This study estimated C emissions from the wildfires across the Alaskan Yukon River Basin in 2004. We spatially related the firescars to land cover types and defined the C fractions of aboveground biomass...
Authors
Zhengxi Tan, Larry L. Tieszen, Zhiliang Zhu, Shuguang Liu, Stephen M. Howard
Mapping existing vegetation composition and structure for the LANDFIRE Prototype Project Mapping existing vegetation composition and structure for the LANDFIRE Prototype Project
The Landscape Fire and Resource Management Planning Tools Prototype Project, or LANDFIRE Prototype Project, required the mapping of existing vegetation composition (cover type) and structural stages at a 30-m spatial resolution to provide baseline vegetation data for the development of wildland fuel maps and for comparison to simulated historical vegetation reference conditions to...
Authors
Zhiliang Zhu, James Vogelmann, Donald O. Ohlen, Jay R. Kost, Xuexia Chen, Brian L. Tolk
An overview of the LANDFIRE Prototype Project An overview of the LANDFIRE Prototype Project
This chapter describes the background and design of the Landscape Fire and Resource Management Planning Tools Prototype Project, or LANDFIRE Prototype Project, which was a sub-regional, proof-of-concept effort designed to develop methods and applications for providing the high-resolution data (30-m pixel) needed to support wildland fire management and to implement the National Fire Plan...
Authors
Robert E. Keane, Zhiliang Zhu, James P. Menakis
Executive summary Executive summary
Geospatial data describing wildland fuel and current as well as historical vegetation conditions are essential for planning, implementing, and monitoring projects supported by the National Fire Plan and the Healthy Forests Restoration Act. Scientifically credible, consistent, and standardized spatial data allow fire and land managers to accurately identify the amount and locations of...
Authors
Matthew G. Rollins, Robert E. Keane, Zhiliang Zhu
Perspectives on LANDFIRE Prototype Project accuracy assessment Perspectives on LANDFIRE Prototype Project accuracy assessment
The purpose of this chapter is to provide a general overview of the many aspects of accuracy assessment pertinent to the Landscape Fire and Resource Management Planning Tools Prototype Project (LANDFIRE Prototype Project). The LANDFIRE Prototype formed a large and complex research and development project with many broad-scale data sets and products developed throughout its various stages...
Authors
James Vogelmann, Zhiliang Zhu, Jay R. Kost, Brian L. Tolk, Donald O. Ohlen