Full name:
Soil Properties USDA -NCSS
Version:
-
Organization or Author:
California Soil Resource Lab at UC Davis and UC-ANR in collaboration with the USDA Natural Resources Conservation Service
Abstract:
It is a set of maps that allows you to explore a variety of soil properties throughout the continental United States. The maps were obtained by aggregating current USDA-NCSS soil survey data (SSURGO back-filled with STATSGO where SSURGO is not available) within 800m grid cells. This data aggregation technique results in maps that may not match the original data at any given point, and is intended to depict regional trends in soil properties at the statewide scale.
Keep in mind that these layers are meant to show regional variation of properties at a coarse scale, and cell values may not be accurate at a specific location. For more information about each layer and its aggregation technique, see the metadata for the corresponding property in the Soil Properties app.
Keep in mind that these layers are meant to show regional variation of properties at a coarse scale, and cell values may not be accurate at a specific location. For more information about each layer and its aggregation technique, see the metadata for the corresponding property in the Soil Properties app.
Service location:
Geographical Coverage:
National - USA
GIS Data Type:
Raster
Spatial resolution:
800 m (800 x 800 m pixel)
Publication date:
2022-10-01
Reference period-start:
1969-09-26
Reference period-stop
2023-10-01
License:
Soil Properties:
Wind Erodibility Index, Available Water Holding Capacity, Cation Exchange Capacity, silt, Organic Matter, Clay, sand, Coarse Fragments, Saturated Hydraulic Conductivity, pH, Electrical Conductivity, Calcium Carbonate, Sodium Adsorption Ratio, KW Factor
Soil deph coverage (cm):
0-60 cm
Citation:
Walkinshaw, Mike, A.T. O'Geen, D.E. Beaudette. "Soil Properties." California Soil Resource Lab, 1 Oct. 2022, Soil Properties - California Soil Resource Lab .
Overview
| Name | Original name | Unit of measurement | Description |
|---|---|---|---|
| Calcium Carbonate | Calcium carbonate | kg/m2 | Calcium carbonate is the quantity of carbonate (CO3) in the soil expressed as CaCO3 and as a weight percentage of the less than 2 mm size fraction. |
| Cation Exchange Capacity | Cation exchange capacity | cmolc/kg | Cation-exchange capacity is the amount of exchangeable cations that a soil can adsorb at pH 7.0. |
| Electrical Conductivity | Electrical Conductivity | dS/m | Electrical conductivity is a measure of the concentration of water-soluble salts in soils. |
| pH | pH | - | pH is a measure of the acidity or alkalinity of the soil. |
| Sodium Adsorption Ratio | Sodium absorption ratio | - | Sodium adsorption ratio is a measure of the amount of sodium (Na+) relative to calcium (Ca2+) and magnesium (Mg2+) in the water extracted from a saturated soil paste. |
| Organic Matter | Organic matter | kg/m2 | Soil organic matter is the weight of decomposed plant and animal residue of the soil material less than 2 mm in diameter. |
| Available Water Holding Capacity | Available water holding capacity | cm | Available water holding capacity is the amount of water that a soil can store that is available for use by plants. |
| Coarse Fragments | Coarse fragments | %v | This is the percent by volume of the soil that is occupied by rock fragments. |
| Saturated Hydraulic Conductivity | Saturated hydraulic conductivity | µm/s | Saturated hydraulic conductivity, or Ksat, is the ease with which pores of a saturated soil transmit water. |
| sand | Sand | % | Percent sand is the weight percentage of the mineral particles less than 2 mm and greater than or equal to 0.05 mm in equivalent diameter in the less than 2 mm soil fraction. |
| silt | Silt | % | Percent silt is the weight percentage of the mineral particles greater than or equal to 0.002 mm but less than 0.05 mm in equivalent diameter in the less than 2 mm soil fraction. |
| Clay | Clay | % | Percent clay is the weight percentage of the mineral particles less than 0.002 mm in equivalent diameter in the less than 2 mm soil fraction. |
| KW Factor | Kw factor | - | Kw is an erodibility factor which quantifies the susceptibility of soil particles to detachment and movement by water. |
| Wind Erodibility Index | Wind erodibility index | t/ac/yr | Wind erodibility index is a numerical value indicating the susceptibility of soil to wind erosion. Units are in tons per acre per year. |