Home >> LBA REGIONAL HISTORICAL CROPLANDS, 5-MIN, 1900-1992 (RAMANKUTTY AND FOLEY)  
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This data set is a subset of a global croplands data set (Ramankutty and Foley 1999a). The subset was created for the study area of the Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) in South America (i.e., 10 N to 25 S, 30 to 85 W). The data are in ASCII GRID format at 5-min resolution. Navin Ramankutty and Jonathan Foley, of the Center for Sustainability and the Global Environment (SAGE) at the University of Wisconsin, developed a global, spatially explicit data set of reconstructed historical croplands from 1700 to 1992. The method for historical reconstruction used a simple algorithm that linked contemporary satellite data and historical cropland inventory data. A spatially explicit croplands data set for 1992 was first derived by calibrating a satellite-derived land cover classification data set against cropland inventory data for 1992. This derived data set was then used within a simple land cover change model, along with historical cropland inventory data, to derive spatially explicit maps of historical croplands. The global data set was restricted to a representation of permanent croplands (i.e., excluding shifting cultivation), which follows the Food and Agriculture Organization (FAO) definition of arable lands and permanent crops. Data values represent fraction of grid cell in croplands. Data for the LBA study area are available for the years 1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980, 1990, and 1992. Although the global croplands data set contains data representing croplands since 1700, essentially no croplands were in the LBA study area until 1900. Data from previous years were excluded at the suggestion of the data originator. More information can be found at ftp://daac.ornl.gov/data/lba/land_use_land_cover_change/historical_croplands/comp/uwcrop_readme.pdf. LBA was a cooperative international research initiative led by Brazil. NASA was a lead sponsor for several experiments. LBA was designed to create the new knowledge needed to understand the climatological, ecological, biogeochemical, and hydrological functioning of Amazonia; the impact of land use change on these functions; and the interactions between Amazonia and the Earth system. More information about LBA can be found at http://www.daac.ornl.gov/LBA/misc_amazon.html.

Ramankutty, N., and J. A. Foley. 2003. LBA Regional Historical Croplands, 5-min, 1900-1992 (Ramankutty and Foley). Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/675.
    
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This data set contains 11 data granules
Page    Records per Page   
Granule Name Variables Metadata Preview Image
    LBA Percentage of Crop in 1900 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1900-01-01
End DateTime: 1900-12-31
LBA Percentage of Crop in 1900
 
    LBA Percentage of Crop in 1910 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1910-01-01
End DateTime: 1910-12-31
LBA Percentage of Crop in 1910
 
    LBA Percentage of Crop in 1920 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1920-01-01
End DateTime: 1920-12-31
LBA Percentage of Crop in 1920
 
    LBA Percentage of Crop in 1930 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1930-01-01
End DateTime: 1930-12-31
LBA Percentage of Crop in 1930
 
    LBA Percentage of Crop in 1940 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1940-01-01
End DateTime: 1940-12-31
LBA Percentage of Crop in 1940
 
    LBA Percentage of Crop in 1950 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1950-01-01
End DateTime: 1950-12-31
LBA Percentage of Crop in 1950
 
    LBA Percentage of Crop in 1960 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1960-01-01
End DateTime: 1960-12-31
LBA Percentage of Crop in 1960
 
    LBA Percentage of Crop in 19760 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1970-01-01
End DateTime: 1970-12-31
LBA Percentage of Crop in 19760
 
    LBA Percentage of Crop in 1980 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1980-01-01
End DateTime: 1980-12-31
LBA Percentage of Crop in 1980
 
    LBA Percentage of Crop in 1990 Projection: WGS 84
Spatial Extent: N: 10, S: -25, E: -30, W: -85
Start DateTime: 1990-01-01
End DateTime: 1990-12-31
LBA Percentage of Crop in 1990