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About Spatial Data Access Tool (SDAT)

 

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  2. NACP MsTMIP: Unified North American Soil Map

The Unified North American Soil Map (UNASM) was developed to provide more accurate regional soil information for terrestrial biosphere modeling. The UNASM combines information from state-of-the-art US STATSGO2 and Soil Landscape of Canada (SLCs) databases. The area not covered by these datasets is filled by using the Harmonized World Soil Database version 1.21 (HWSD1.21). The UNASM contains maximum soil depth derived from the data source as well as seven soil attributes (including sand, silt, and clay content, gravel content, organic carbon content, pH, and bulk density) for the topsoil layer (0 – 30 cm) and the subsoil layer (30 – 100 cm), respectively, of the spatial resolution of 0.25 degrees in latitude and longitude. There are pronounced differences in the spatial distributions of soil properties and soil organic carbon between UNASM and HWSD, but the UNASM overall provides more detailed and higher-quality information particularly in Alaska and central Canada. To provide more accurate and up-to-date estimate of soil organic carbon stock in North America, we incorporated Northern Circumpolar Soil Carbon Database (NCSCD) into the UNASM. The estimate of total soil organic carbon mass in the upper 100 cm soil profile based on the improved UNASM is 365.96 Pg, of which 23.1% is under trees, 14.1% is in shrubland, and 4.6% is in grassland and cropland. This UNASM data will provide a resource for use in terrestrial ecosystem modeling both for input of soil characteristics and for benchmarking model output.
Reference: Liu, S., Wei, Y., Post, W. M., Cook, R. B., Schaefer, K., and Thornton, M. M.: The Unified North American Soil Map and its implication on the soil organic carbon stock in North America, Biogeosciences, 10, 2915-2930, doi:10.5194/bg-10-2915-2013, 2013.

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Use the links in the table below to view and download data using WCS.

This data set contains 18 data granules
Granule Name Variables Metadata Preview Image
    UNASM: First Dominant Soil Component Area Percentage area percentage Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: First Dominant Soil Component Area Percentage
 
    UNASM: Subsoil Cation Exchange Capacity soil cec Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Cation Exchange Capacity
 
    UNASM: Subsoil Clay Fraction soil clay fraction Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Clay Fraction
 
    UNASM: Subsoil Gravel Content soil gravel content Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Gravel Content
 
    UNASM: Subsoil pH soil pH Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil pH
 
    UNASM: Subsoil Reference Bulk Density soil reference bulk density Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Reference Bulk Density
 
    UNASM: Subsoil Sand Fraction soil sand fraction Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Sand Fraction
 
    UNASM: Subsoil Silt Fraction soil silt fraction Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoil Silt Fraction
 
    UNASM: Subsoils Organic Carbon soil organic carbon Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: Subsoils Organic Carbon
 
    UNASM: The Maximum Soil Depth soil depth Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
UNASM: The Maximum Soil Depth