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NRCS Soils Data

NRCS Soils Data. National Soil Information System NASIS. NRCS Soil Data. Origins pre-date computers and models data collection spans decades. Not designed or maintained with modeling in mind. Not perfect; need to have a procedure to handle errors and omissions.

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NRCS Soils Data

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  1. NRCS Soils Data National Soil Information System NASIS

  2. NRCS Soil Data • Origins pre-date computers and models • data collection spans decades. • Not designed or maintained with modeling in mind. • Not perfect; need to have a procedure to handle errors and omissions. • Must be adapted to meet model needs

  3. Characterization Data 70+ years Support classification and Soil Taxonomy Support interpretations Point data, measured Horizons NASIS ~20 years, early computer tech Interpret char. data Provides interp. data for broad landuse decisions Mapunit based, not pt. Layers NRCS Soil Databases

  4. NRCS Soil Databases • Both NASIS and Soil Taxonomy are landuse independent. • Characterization data may provide clues. • Use Soil Taxonomy to fill or fix bad records.

  5. NRCS Soil Databases • NASIS reports a Representative Value (RV) and a range, hi and lo. • Use the value that best reflects the landuse being modeled. • The RV works better for empirical models like RUSLE than a process model like EPIC or APEX

  6. Ap Layer 1 AB Bt1 Layer 2 Bt2 2Bt3 Layer 3 2Bt4

  7. Updates for modeling • Established research grade position for modeling support for Soil Survey. • Rapid C project. Collecting soil carbon data at NRI points. • Error and omission checking. • Begin collection of dynamic soil propeprties and data structure for dissemination.

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