SSURGO Downloader

Rapid Direct Access to SSURGO Data

Do you need soil data for your analysis? The Soils Team has created the SSURGO Downloader application to provide rapid, direct access to the most commonly used portions of SSURGO data. The application allows you to select an area, click a link in the pop-up, download, and open a ready-to-use map in ArcGIS for Desktop.

Click on the map to open a pop-up and download a map package that contains SSURGO data for that subbasin

No longer do you have to spend time learning about the SSURGO database structure before you can use the data. No longer do you have to figure out how to import the data into the ArcGIS system to get your job done. The Soils Team has compiled a map with 130 of the most useful SSURGO variables. The data are packaged by subbasin (HUC8 from the Watershed Boundary Dataset) and are made available through this SSURGO Downloader application.

The SSURGO data selected for this application consist of basic descriptions of the data (from the Map Unit Feature Class and Map Unit tables), a collection of interpretations (from the MUAGGATT table), and aggregated information about the components of each map unit (Component table). We chose these data because they represent the most commonly used fields in SSURGO and many of these values serve as standard inputs to assessment and modeling processes.

Data from the four SSURGO tables were assembled into the single table included in each map package. Data from the component table were aggregated using a dominant component model (listed below under Component Table - Dominant Component) or a weighted average model (listed below under Component Table - Weighted Average) using custom Python scripts. The the Mapunit table, the MUAGATTAT table and the processed Component table data were joined to the Mapunit Feature Class. Field aliases were added and indexes calculated. A field named Map Symbol was created and populated with random integers from 1-10 for symbolizing the soil units in the map package.

For documentation of the SSURGO dataset see:

http://soildatamart.nrcs.usda.gov/SSURGOMetadata.aspx

For documentation of the Watershed Boundary Dataset see:

http://www.nrcs.usda.gov/wps/portal/nrcs/main/national/water/watersheds/dataset

The map packages contain the following attributes in the Map Units layer:

Map Unit Feature Class:

Survey Area

Spatial Version

Mapunit Symbol

Mapunit Key

National Mapunit Symbol

Map Unit Table:

Mapunit Name

Mapunit Kind

Mapunit Status

Farmland Class

Highly Erodible Lands Classification - Wind and Water

Highly Erodible Lands Classification - Water

Highly Erodible Lands Classification - Wind

Interpretive Focus

Intensity of Mapping

Mapunit Certification Status

Legend Key

Mapunit Sequence

MUAGGATT Table:

Slope Gradient - Dominant Component

Slope Gradient - Weighted Average

Bedrock Depth - Minimum

Water Table Depth - Annual Minimum

Water Table Depth - April to June Minimum

Flooding Frequency - Dominant Condition

Flooding Frequency - Maximum

Ponding Frequency - Presence

Available Water Storage 0-25 cm - Weighted Average

Available Water Storage 0-50 cm - Weighted Average

Available Water Storage 0-100 cm - Weighted Average

Available Water Storage 0-150 cm - Weighted Average

Drainage Class - Dominant Condition

Drainage Class - Wettest

Hydrologic Group - Dominant Condition

Irrigated Capability Class - Dominant Condition

Irrigated Capability Class - Proportion of Mapunit with Dominant Condition

Non-Irrigated Capability Class - Dominant Condition

Non-Irrigated Capability Class - Proportion of Mapunit with Dominant Condition

Rating for Buildings without Basements - Dominant Condition

Rating for Buildings with Basements - Dominant Condition

Rating for Buildings with Basements - Least Limiting

Rating for Buildings with Basements - Most Limiting

Rating for Septic Tank Absorption Fields - Dominant Condition

Rating for Septic Tank Absorption Fields - Least Limiting

Rating for Septic Tank Absorption Fields - Most Limiting

Rating for Sewage Lagoons - Dominant Condition

Rating for Sewage Lagoons - Dominant Component

Rating for Roads and Streets - Dominant Condition

Rating for Sand Source - Dominant Condition

Rating for Sand Source - Most Probable

Rating for Paths and Trails - Dominant Condition

Rating for Paths and Trails - Weighted Average

Erosion Hazard of Forest Roads and Trails - Dominant Component

Hydric Classification - Presence

Rating for Manure and Food Processing Waste - Weighted Average

Component Table - Weighted Average:

Mean Annual Air Temperature - High Value

Mean Annual Air Temperature - Low Value

Mean Annual Air Temperature - Representative Value

Albedo - High Value

Albedo - Low Value

Albedo - Representative Value

Slope - High Value

Slope - Low Value

Slope - Representative Value

Slope Length - High Value

Slope Length - Low Value

Slope Length - Representative Value

Elevation - High Value

Elevation - Low Value

Elevation - Representative Value

Mean Annual Precipitation - High Value

Mean Annual Precipitation - Low Value

Mean Annual Precipitation - Representative Value

Days between Last and First Frost - High Value

Days between Last and First Frost - Low Value

Days between Last and First Frost - Representative Value

Crop Production Index

Range Forage Annual Potential Production - High Value

Range Forage Annual Potential Production - Low Value

Range Forage Annual Potential Production - Representative Value

Initial Subsidence - High Value

Initial Subsidence - Low Value

Initial Subsidence - Representative Value

Total Subsidence - High Value

Total Subsidence - Low Value

Total Subsidence - Representative Value

Esri generated field for symbology:

Map Symbol

Component Table - Dominant Component:

Component Key

Component Percentage - Low Value

Component Percentage - Representative Value

Component Percentage - High Value

Component Name

Component Kind

Other Criteria Used to Identify Components

Criteria Used to Identify Components at the Local Level

Runoff

Soil Loss Tolerance Factor

Wind Erodibility Index

Wind Erodibility Group

Erosion Class

Earth Cover 1

Earth Cover 2

Hydric Condition

Aspect Range - Counter Clockwise Limit

Aspect - Representative Value

Aspect Range - Clockwise Limit

Geomorphic Description

Non-Irrigated Capability Subclass

Non-Irrigated Unit Capability Class

Irrigated Capability Subclass

Irrigated Unit Capability Class

Conservation Tree Shrub Group

Forage Suitability Group

Soil Slip Potential

Susceptibility to Frost Heaving

Concrete Corrosion

Steel Corrosion

Taxonomic Class Name

Order

Suborder

Great Group

Subgroup

Particle Size

Particle Size Modifier

Cation Exchange Activity Class

Carbonate Reaction

Temperature Class

Moisture Subclass

Soil Temperature Regime

Edition of Keys to Soil Taxonomy Used to Classify Soil

In accordance with NRCS recommendations, we suggest the following citation for the data:

Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Soil Survey Geographic (SSURGO) Database for [Survey Area, State]. Available online at http://www.arcgis.com/apps/OnePane/basicviewer/index.html?appid=a23eb436f6ec4ad6982000dbaddea5ea . Accessed [month/day/year].

Authors: Richard Nauman (rnauman@esri.com), Michael Dangermond (mdangermond@esri.com), Charlie Frye (cfrye@esri.com)