Global Landuse Modeling (GLM) Data
Entry ID: EOSWEBSTER_GLM

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Summary
Abstract: To accurately assess the impacts of human land-use on the Earth System, information is needed on the current and historical patterns of land-use activities. The Global Landuse Modeling (GLM) Data collection provides the first global gridded estimates of the underlying land conversions (land-use transitions), wood harvesting, and resulting secondary lands annually, for the period 1700-2000. Using data-based historical scenarios, our results suggest that 42-68% of the land surface was impacted by land-use activities (crop, pasture, wood harvest) during this period, some multiple times. Secondary land area increased 10,000,000 to 44,000,000 km2 ; about half of this was forested. Wood harvest and shifting cultivation generated 70-90% of the secondary land by 2000; permanent abandonment and relocation of agricultural land accounted for the rest. This modeled data provides important estimates of global land-use activities for studies attempting to assess the consequences of changes to the Earth's surface over time. For this study, six major factors were evaluated that influence land-use transitions and the resulting amount, distribution, and age of secondary lands. Because the details of each of these factors are important but generally not well known historically, a scenario approach was performed to bracket the uncertainty of model estimates.

The two focal scenarios chosen for detailed analyses were based on three criteria: quantity of data inputs, the reasonableness of model assumptions, and comparisons of estimates of secondary land area to independent estimates published by the Food and Agriculture Organization (FAO 1998). One scenario was based the detailed land-use history reconstruction of Hyde (H1), and the second on Sage-Hyde (H2). Both scenarios were driven with the FAO-based wood harvest reconstruction (L1). Both concentrated wood harvesting activities in grid-cells with land use (Z1); a recent FAO study on forest accessibility found that about half the world's forest was within 10 km of major transportation infrastructure (roads, railways, rivers), and about three-quarters within 40 km (FAO, 2001). Both scenarios applied minimum transitions outside the tropics and non-minimum transitions (e.g. shifting agriculture) in the tropics (T3), roughly corresponding to the distribution of shifting cultivation in the mid-late 1900s (Butler, 1980; Lanly, 1985).

For details of the remaining model assumptions, data values and parameters, consult the Detailed data Guide at the EOS-WEBSTER data distribution site. Since the model settings for the focal scenarios are sub global, we chose to refer to them simply as "Hyde" and "Sage-Hyde". Other scenarios will be added in the future. Currently, only the two focal scenarios are available for beta testing. (Please contact User Support if you are interested in obtaining data for the other scenarios.) Missing data values are set to "-1".

Related URL
Link: GET DATA
Description: Access to GLM data holdings.


Link: VIEW RELATED INFORMATION
Description: Access to additional documentation for GLM.


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: Hurtt, George C., S. Frolking and M. Fearon
Dataset Title: Global Landuse Modeling Data
Dataset Release Date: 2005
Dataset Release Place: Durham, NH
Dataset Publisher: EOS-WEBSTER, University of New Hampshire
Online Resource: http://eos-earthdata.sr.unh.edu/


Temporal Coverage
Start Date: 1700-01-01
Stop Date: 2000-12-31


Location Keywords
GEOGRAPHIC REGION > GLOBAL LAND


Science Keywords
AGRICULTURE >FOREST SCIENCE >FOREST HARVESTING AND ENGINEERING    [Definition]
BIOSPHERE >VEGETATION >REFORESTATION    [Definition]
BIOSPHERE >VEGETATION >VEGETATION COVER    [Definition]
HUMAN DIMENSIONS >ECONOMIC RESOURCES >AGRICULTURE PRODUCTION    [Definition]
HUMAN DIMENSIONS >HABITAT CONVERSION/FRAGMENTATION >RECLAMATION/REVEGETATION/RESTORATION >GLOBAL    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT >LAND USE CLASSES    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND USE CLASSES    [Definition]


ISO Topic Category
IMAGERY/BASE MAPS/EARTH COVER


Project
ESIP >Earth Science Information Partners Program    [Information]


Access Constraints
These data are provided free of charge to the general public.


Use Constraints
Recipients have a responsibility to

1. Cite: Hurtt, G.C., S. Frolking, M.G. Fearon, B. Moore III,
E. Shevliakova, S. Malyshev, S. Pacala, R.A. Houghton. The
underpinnings of land-use history: three centuries of global gridded
land-use transitions, wood harvest activity, and resulting secondary
lands. In review by Global Change Biology.

2. Acknowledge the University of New Hampshire, EOS-WEBSTER Earth
Science Information Partner (ESIP) as the data distributor for this
dataset.

3. For proper use and interpretation of data, contact Dr. Hurtt or Dr.
Frolking or Mr. Fearon (matthew.fearon@unh.edu)


Keywords
Hyde
EOS-WEBSTER
UNH
University of New Hampshire
Model
NASA/ESIP
Landuse
Hyde/Sage
Global Landuse Modeling
Wood harvest
Pasture Land
World
logging
secondary land
global change
cultivation
agriculture


Data Center
EOS-EARTHDATA, Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, Univ. of New Hampshire    [Information]
Data Center URL: http://eos-earthdata.sr.unh.edu/

Data Center Personnel
Name: EARTH SYSTEMS RESEARCH CENTER
Phone: 1-603-862-3785
Fax: 603-862-0188
Email: eosearthdatasupport at foghorn.sr.unh.edu
Contact Address:
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA



Distribution
Distribution_Format: ASCII text, HDF-EOS, NETCDF, BSQ


Personnel
ANNETTE SCHLOSS
Role: TECHNICAL CONTACT
Phone: 603-862-0348
Fax: 603-862-0188
Email: annette.schloss at unh.edu
Contact Address:
Complex Systems Research Center
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA


GEORGE HURTT
Role: INVESTIGATOR
Phone: 603-862-1792
Fax: 603-862-0188
Contact Address:
Complex Systems Research Center, Morse Hall
Univeristy of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824


STEVE FROLKING
Role: INVESTIGATOR
Phone: 603-862-1792
Fax: 603-862-0188
Contact Address:
Complex Systems Research Center, Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824


MATTHEW FEARON
Role: TECHNICAL CONTACT
Phone: 603-862-1792
Fax: 603-862-0188
Email: matthew.fearon at unh.edu
Contact Address:
Complex Systems Research Center
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA


EOS-WEBSTER SUPPORT
Role: DIF AUTHOR
Phone: 1-877-589-4909
Fax: 603-862-0188
Email: support at eos-webster.sr.unh.edu
Contact Address:
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA


Publications/References
Hurtt, G.C., S. Frolking, M.G. Fearon, B. Moore III, E. Shevliakova,
S. Malyshev, S. Pacala, R.A. Houghton. The underpinnings of land-use
history: three centuries of global gridded land-use transitions, wood
harvest activity, and resulting secondary lands. In review by Global
Change Biology.

Creation and Review Dates
DIF Creation Date: 2005-12-06
Last DIF Revision Date: 2013-08-09

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