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NACP MsTMIP: Unified North American Soil Map


DatasetNACP MsTMIP: Unified North American Soil Map
Release date2014-08-27
Time period1993-01-01 to 2010-12-30

Usage Metrics

CountEarliest DateLatest DateData Usage
Citations120152015Publications citing this dataset
Downloads6862014-08-292017-12-158337 total files downloaded


This data set provides soil maps for the United States (US) (including Alaska), Canada, Mexico, and a part of Guatemala. The map information content includes maximum soil depth and eight soil attributes including sand, silt, and clay content, gravel content, organic carbon content, pH, cation exchange capacity, and bulk density for the topsoil layer (0-30 cm) and the subsoil layer (30-100 cm). The spatial resolution is 0.25 degree. The Unified North American Soil Map (UNASM) combined information from the state-of-the-art US General Soil Map (STATSGO2) and Soil Landscape of Canada (SLCs) databases. The area not covered by these data sets was filled by using the Harmonized World Soil Database version 1.21 (HWSD1.21). The Northern Circumpolar Soil Carbon (NCSCD) database was used to provide more accurate and up-to-date soil organic carbon information for the high-latitude permafrost region and was combined with soil organic carbon content derived from the UNASM (Liu et al., 2013). The UNASM data were utilized in the North American Carbon Program (NACP) Multi-Scale Synthesis and Terrestrial Model Intercomparison Project (MsTMIP) as model input driver data (Huntzinger et al., 2013). The driver data were used by 22 terrestrial biosphere models to run baseline and sensitivity simulations. The compilation of these data was facilitated by the NACP Modeling and Synthesis Thematic Data Center (MAST-DC). MAST-DC was a component of the NACP ( designed to support NACP by providing data products and data management services needed for modeling and synthesis activities.

Dataset documentation


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Crosscite Citation Formatter
Liu, Shishi, Y. Wei, W.M. Post, R.B. Cook, K. Schaefer, and M.M. Thornton. 2014. NACP MsTMIP: Unified North American Soil Map. ORNL DAAC, Oak Ridge, Tennessee, USA.

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Data Files

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Data File (Granule)File SizeDates
Unified_NA_Soil_Map_First_Dominant_Soil_Component_Area_Percentage.tif 305.5KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Gravel_Content.tif 162.6KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Sand_Fraction.tif 163.2KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Cation_Exchange_Capacity.tif 174.9KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_pH.tif 192.2KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Silt_Fraction.tif 159.9KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Gravel_Content.tif 167.4KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Reference_Bulk_Density.tif 214.6KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Maximum_Soil_Depth.tif 145.2KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Clay_Fraction.tif 157.3KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Cation_Exchange_Capacity.tif 170.7KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Clay_Fraction.tif 165.3KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_pH.tif 191.1KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Organic_Carbon.tif 212.0KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Silt_Fraction.tif 165.0KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Topsoil_Sand_Fraction.tif 167.6KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Organic_Carbon.tif 193.1KB 1993-01-01 to 2010-12-30
Unified_NA_Soil_Map_Subsoil_Reference_Bulk_Density.tif 199.6KB 1993-01-01 to 2010-12-30

Companion Files

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Dataset has 2 companion files.

  • Liu_et_al_2013.pdf
  • NACP_MsTMIP_Unified_NA_Soil_Map.pdf

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