Thomas Loveland (Former Employee)
Science and Products
Filter Total Items: 140
Comparative analysis of GPP products estimated from an empirical model and MODIS
Carbon-cycle models have uncertainties associated with data inputs, parameters, and model algorithms. The prerequisite for an applicable model is that it should perform at an acceptable level of accuracy and uncertainties should be documented. In this study, we validated the gross primary productivity (GPP) data from a piecewise regression (PWR) model and the MODIS GPP model at five grassland flux
Authors
Li Zhang, Bruce K. Wylie, Thomas Loveland, Lei Ji
Upscaling terrestrial carbon dynamics from sites to regions with uncertainty measures—The GEMS experience
No abstract available.
Authors
Shuguang Liu, Z. Li, Jinxun Liu, Thomas Loveland, M. Chen, Larry L. Tieszen
Temporal evolution of carbon budgets of the Appalachian forests in the U.S. from 1972 to 2000
Estimating dynamic terrestrial ecosystem carbon (C) sources and sinks over large areas is difficult. The scaling of C sources and sinks from the field level to the regional level has been challenging due to the variations of climate, soil, vegetation, and disturbances. As part of an effort to estimate the spatial, temporal, and sectional dimensions of the United States C sources and sinks (the U.S
Authors
J. Liu, S. Liu, Thomas R. Loveland
Land use/land cover change effects on temperature trends at U.S. Climate Normals stations
Alterations in land use/land cover (LULC) in areas near meteorological observation stations can influence the measurement of climatological variables such as temperature. Urbanization near climate stations has been the focus of considerable research attention, however conversions between non-urban LULC classes may also have an impact. In this study, trends of minimum, maximum, and average temperat
Authors
R. C. Hale, K. P. Gallo, T.W. Owen, Thomas R. Loveland
Geography for a Changing World - A science strategy for the geographic research of the U.S. Geological Survey, 2005-2015
This report presents a science strategy for the geographic research of the U.S. Geological Survey (USGS) for the years 2005-2015. The common thread running through the vision, mission, and science goals presented in the plan is that USGS geographers will provide national leadership to understand coupled human-environmental systems in the face of land change and will deliver pertinent information t
Authors
Gerard McMahon, Susan P. Benjamin, Keith Clarke, John E. Findley, Robert N. Fisher, William L. Graf, Linda C. Gundersen, John Jones, Thomas R. Loveland, Keven S. Roth, E. Lynn Usery, Nathan J. Wood
Perspectives on the use of land-cover data for ecological investigations
No abstract available.
Authors
Thomas R. Loveland, Alisa L. Gallant, James E. Vogelmann
Rural land-use trends in the conterminous United States, 1950-2000
In order to understand the magnitude, direction, and geographic distribution of land-use changes, we evaluated land-use trends in U.S. counties during the latter half of the 20th century. Our paper synthesizes the dominant spatial and temporal trends in population, agriculture, and urbanized land uses, using a variety of data sources and an ecoregion classification as a frame of reference. A combi
Authors
Daniel G. Brown, Kenneth M. Johnson, Thomas R. Loveland, David M. Theobald
Soil organic carbon dynamics as related to land use history in the northwestern Great Plains
Strategies for mitigating the global greenhouse effect must account for soil organic carbon (SOC) dynamics at both spatial and temporal scales, which is usually challenging owing to limitations in data and approach. This study was conducted to characterize the SOC dynamics associated with land use change history in the northwestern Great Plains ecoregion. A sampling framework (40 sample blocks of
Authors
Z. Tan, S. Liu, C.A. Johnston, Thomas R. Loveland, L.L. Tieszen, J. Liu, R. Kurtz
An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover
Statistical sampling offers a cost-effective, practical alternative to complete-coverage mapping for the objective of estimating gross change in land cover over large areas. Because land cover change is typically rare, the sampling strategy must take advantage of design and analysis tools that enhance precision. Using two populations of land cover change in the eastern United States, we demonstrat
Authors
S.V. Stehman, Terry L. Sohl, Thomas R. Loveland
Ecoregions and ecoregionalization: geographical and ecological perspectives
Ecoregions, i.e., areas exhibiting relative homogeneity of ecosystems, are units of analysis that are increasingly important in environmental assessment and management. Ecoregions provide a holistic framework for flexible, comparative analysis of complex environmental problems. Ecoregions mapping has intellectual foundations in both geography and ecology. However, a hallmark of ecoregions mapping
Authors
Thomas R. Loveland, James W. Merchant
The characteristics and interpretability of land surface change and implications for project design
The need for comprehensive, accurate information on land-cover change has never been greater. While remotely sensed imagery affords the opportunity to provide information on land-cover change over large geographic expanses at a relatively low cost, the characteristics of land-surface change bring into question the suitability of many commonly used methodologies. Algorithm-based methodologies to de
Authors
Terry L. Sohl, Alisa L. Gallant, Thomas R. Loveland
Science and Products
Filter Total Items: 140
Comparative analysis of GPP products estimated from an empirical model and MODIS
Carbon-cycle models have uncertainties associated with data inputs, parameters, and model algorithms. The prerequisite for an applicable model is that it should perform at an acceptable level of accuracy and uncertainties should be documented. In this study, we validated the gross primary productivity (GPP) data from a piecewise regression (PWR) model and the MODIS GPP model at five grassland flux
Authors
Li Zhang, Bruce K. Wylie, Thomas Loveland, Lei Ji
Upscaling terrestrial carbon dynamics from sites to regions with uncertainty measures—The GEMS experience
No abstract available.
Authors
Shuguang Liu, Z. Li, Jinxun Liu, Thomas Loveland, M. Chen, Larry L. Tieszen
Temporal evolution of carbon budgets of the Appalachian forests in the U.S. from 1972 to 2000
Estimating dynamic terrestrial ecosystem carbon (C) sources and sinks over large areas is difficult. The scaling of C sources and sinks from the field level to the regional level has been challenging due to the variations of climate, soil, vegetation, and disturbances. As part of an effort to estimate the spatial, temporal, and sectional dimensions of the United States C sources and sinks (the U.S
Authors
J. Liu, S. Liu, Thomas R. Loveland
Land use/land cover change effects on temperature trends at U.S. Climate Normals stations
Alterations in land use/land cover (LULC) in areas near meteorological observation stations can influence the measurement of climatological variables such as temperature. Urbanization near climate stations has been the focus of considerable research attention, however conversions between non-urban LULC classes may also have an impact. In this study, trends of minimum, maximum, and average temperat
Authors
R. C. Hale, K. P. Gallo, T.W. Owen, Thomas R. Loveland
Geography for a Changing World - A science strategy for the geographic research of the U.S. Geological Survey, 2005-2015
This report presents a science strategy for the geographic research of the U.S. Geological Survey (USGS) for the years 2005-2015. The common thread running through the vision, mission, and science goals presented in the plan is that USGS geographers will provide national leadership to understand coupled human-environmental systems in the face of land change and will deliver pertinent information t
Authors
Gerard McMahon, Susan P. Benjamin, Keith Clarke, John E. Findley, Robert N. Fisher, William L. Graf, Linda C. Gundersen, John Jones, Thomas R. Loveland, Keven S. Roth, E. Lynn Usery, Nathan J. Wood
Perspectives on the use of land-cover data for ecological investigations
No abstract available.
Authors
Thomas R. Loveland, Alisa L. Gallant, James E. Vogelmann
Rural land-use trends in the conterminous United States, 1950-2000
In order to understand the magnitude, direction, and geographic distribution of land-use changes, we evaluated land-use trends in U.S. counties during the latter half of the 20th century. Our paper synthesizes the dominant spatial and temporal trends in population, agriculture, and urbanized land uses, using a variety of data sources and an ecoregion classification as a frame of reference. A combi
Authors
Daniel G. Brown, Kenneth M. Johnson, Thomas R. Loveland, David M. Theobald
Soil organic carbon dynamics as related to land use history in the northwestern Great Plains
Strategies for mitigating the global greenhouse effect must account for soil organic carbon (SOC) dynamics at both spatial and temporal scales, which is usually challenging owing to limitations in data and approach. This study was conducted to characterize the SOC dynamics associated with land use change history in the northwestern Great Plains ecoregion. A sampling framework (40 sample blocks of
Authors
Z. Tan, S. Liu, C.A. Johnston, Thomas R. Loveland, L.L. Tieszen, J. Liu, R. Kurtz
An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover
Statistical sampling offers a cost-effective, practical alternative to complete-coverage mapping for the objective of estimating gross change in land cover over large areas. Because land cover change is typically rare, the sampling strategy must take advantage of design and analysis tools that enhance precision. Using two populations of land cover change in the eastern United States, we demonstrat
Authors
S.V. Stehman, Terry L. Sohl, Thomas R. Loveland
Ecoregions and ecoregionalization: geographical and ecological perspectives
Ecoregions, i.e., areas exhibiting relative homogeneity of ecosystems, are units of analysis that are increasingly important in environmental assessment and management. Ecoregions provide a holistic framework for flexible, comparative analysis of complex environmental problems. Ecoregions mapping has intellectual foundations in both geography and ecology. However, a hallmark of ecoregions mapping
Authors
Thomas R. Loveland, James W. Merchant
The characteristics and interpretability of land surface change and implications for project design
The need for comprehensive, accurate information on land-cover change has never been greater. While remotely sensed imagery affords the opportunity to provide information on land-cover change over large geographic expanses at a relatively low cost, the characteristics of land-surface change bring into question the suitability of many commonly used methodologies. Algorithm-based methodologies to de
Authors
Terry L. Sohl, Alisa L. Gallant, Thomas R. Loveland