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STATSGO Soils Metadata

Disclaimer: The soils data for the portion of the basin in Mexico are not a product
of the STATSGO database.  Because Mexico does not have STATSGO soil maps, these data
were improvised from the FAO soils into the STATSGO format solely for the purpose of
running AGWA on the entire basin.  The data is intended to be used for demonstration/
training purposes only, and is not considered to be scientifically valid south of the
U.S. - Mexico border.
DATASET NAME: MEX_STATSGO

Identification_Information:
  Citation:
    Citation_Information:
      Originator: Schwarz, G.E. and Alexander, R.B.
      Publication_Date: 19950901
      Title: State Soil Geographic (STATSGO) Data Base for the
             Coternimous United States
      Edition: 1.1
      Geospatial_Data_Presentation_Form: Series_Name Open-File Report
                                         Issue_Identification 95-449
      Publication_Information:
        Publication_Place: Reston, VA
        Publisher: U.S. Geological Survey
      Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ussoils
  • Description: Abstract: USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United States. The coverage was compiled from individual State coverages contained in the October 1994 State Soil Geographic (STATSGO) Data Base produced on CD-ROM. The geo-dataset USSOILS.PAT relates (on the basis of a map unit identifier) the 10,498 map units to 78,518 polygons. The scale of the geo-dataset is 1:250,000. The INFO attribute table USSOILS.MUID_ATTS contains selected variables from the STATSGO data set for 10,501 map units (an extra 3 map units are contained in the attribute table that are not in the geo-dataset - see the 'Procedures' section below), including: the map unit identifier, a 2-character state abbreviation, available water capacity of the soil, percent clay in the soil, the actual k-factor used in the water erosion component of the universal soil loss equation, the organic material in soil, soil permeability, cumulative thickness of all soil layers, hydrologic characteristics of the soil, quality of drainage, surface slope, liquid limit of the soil, share of a map unit having hydric soils, and the annual frequency of flooding. To facilitate mapping the attribute data, the narrative section below contains instructions for transferring the information contained in the attribute table USSOILS.MUID_ATTS to the polygon attribute table USSOILS.PAT. STATSGO United States Soil Water Capacity Clay Organic material Permeability Infiltration Drainage Hydric Flood frequency Slope Purpose: The USSOILS coverage was originally compiled to support a national model of water quality. The model uses the soil characteristics contained in this coverage to mediate deliveries of nonpoint source pollution to stream and river segments in the RF1 data base. The National Resource Conservation Service (NRCS) recommends that any maps using NRCS STATSGO data show the source and date, and provide the following statement: "STATSGO is designed to support regional, multistate, State, and river basin resource planning, management and monitoring." Supplemental_Information: Data_Type: COVER Software: Arc/INFO 8.2 Operating_System: Windows 2000 Path_Name: \SPDB\Coverages\mex_statsgo Related_Spatial_Data_Files: All geodatasets with sp_ prefix References_Cited: Notes: See metadata for Arizona STATSGO (dataset name = sp_statsgo) for additional information on STATSGO procedures. Cloud_Cover: N/A Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: Unknown Currentness_Reference: Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 532979.188 East_Bounding_Coordinate: 608189.188 North_Bounding_Coordinate: 3426345.250 South_Bounding_Coordinate: 3592665.250 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: State Soil Geographic (STATSGO) Data Base for the Conterminous United States Theme_Keyword: San Pedro Theme_Keyword: STATSGO Theme_Keyword: watershed Access_Constraints: None Use_Constraints: The National Resource Conservation Service recommends that the data not be used to describe soil characteristics for regions smaller than a multi-county area. Data_Provider_Information: Contact_Information: Contact_Organization_Primary: Contact_Organization: EPA NERL Las Vegas Contact_Person: Bill Kepner Contact_Address: Address_Type: Address: P.O. Box 93478 City: Las Vegas State_or_Province: Nevada Postal_Code: 89193-3478 Contact_Voice_Telephone: 702 798 2193 Contact_Email_Address: kepner.william@epamail.epa.gov Data_Processor_Information: Contact_Information: Contact_Organization_Primary: Contact_Organization: USDA-ARS Southwest Watershed Research Center Contact_Person: Darius Semmens Contact_Address: Address_Type: Address: 2000 E Allen Rd. City: Tucson State_or_Province: AZ Postal_Code: 85719 Contact_Voice_Telephone: 520-670-6380 Contact_Email_Address: dsemmens@tucson.ars.ag.gov Metadata_Reference_Information: Metadata_Date: 09/05/03 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Soren Scott Contact_Organization: U.S. Geological Survey, Water Resource Div. (WRD) Contact_Position: Economist, Branch of Systems Analysis Contact_Address: Address_Type: mailing address Address: 2000 E Allen Rd. City: Tucson State_or_Province: AZ Postal_Code: 85719 Country: USA Contact_Voice_Telephone: 520 670 6380 Contact_Facsimile_Telephone: 520 670 5550 Contact_Electronic_Mail_Address: sscott@tucson.ars.ag.gov Metadata_Standard_Version: Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Quantitative_Attribute_Accuracy_Assessment: Attribute_Accuracy_Value: See explanation Attribute_Accuracy_Explanation: Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Logical_Consistency_Report: Polygon topology present Completeness_Report: Not presently available Positional_Accuracy: Horizontal_Positional_Accuracy: Vertical_Positional_Accuracy: Not presently available Lineage: Process_Step: Process_Description: Reprojected and clipped to SP boundary. Modified clipped AZ STATSGO data to include Mexican portion of the basin. Soil polygons for Mexico derived from FAO soils data, and MUID values modified for Mexican polygons as a 'best guess' approximation to match AZ classes for use with AGWA. Process_Date: 7/29/03 Process_Time: SPATIAL REFERENCE INFORMATION Grid Coordinate System: UTM Horizontal Datum: NAD83 Zone: 12 Units: METERS Scale: Precision: SINGLE SPATIAL DATA ORGANIZATION INFORMATION Number of Arcs: 260 Annotations: 0 Points: 0 Polygons: 67 Tics: 1347 ENTITY AND ATTRIBUTE INFORMATION Detailed_Description: Entity_Type: Entity_Type_Label: USSOILS.PAT Entity_Type_Definition: selected items of hydrologic relevance from the STATSGO Data Base Entity_Type_Definition_Source: STATSGO Data Base ARC/INFO 7.0 Coverage CDROM, October 1994 Attibute: Attribute_Label: - Attribute_Definition: Selected items of hydrologic relevance from the STATSGO Data Base Attribute_Definition_Source: STATSGO Data Base ARC/INFO 7.0 Coverage CDROM October 1994 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: - Attribute: Attribute_Label: AREA Attribute_Definition: area of poly in square coverage units Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: positive real numbers Attribute: Attribute_Label: PERIMETER Attribute_Definition: perimeter of polygon in coverage units Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Positive real numbers Attribute: Attribute_Label: USSOILS# Attribute_Definition: internal feature number Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Values: sequential unique positive number Attribute: Attribute_Label: USSOILS-ID Attribute_Definition: user-assigned feature number Attribute_Definition_Source: user-defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: integer Attribute: Attribute_Label: MUID Attribute_Definition: Mapunit Identification code - used to reference observations Attribute_Definition_Source: STATSGO, October 1994 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: character Attribute: Attribute_Label: STATE Attribute_Definition: 2-character state abbreviation Attribute_Definition_Source: created from first two characters of muid in STATSGO data base Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: character Attribute: Attribute_Label: AWC Attribute_Definition: Avaliable water capacity (inches per inch) Attribute_Definition_Source: Created from AWCH and AWCL in STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Positive real numbers, missing value indicator=-0.1 Attribute: Attribute_Label: CLAY Attribute_Definition: percent clay in soil (percent of material less than 2mm in size) Attribute_Definition_Source: created from clayh and clayl in STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 to 100, missing value indicator = -0.1 Attribute: Attribute_Label: KFFACT Attribute_Definition: Actual k factor used in water erosion component of universal soil loss equation Attribute_Definition_Source: Created from STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Non-negative real, missing value indicator = -0.1 Attribute: Attribute_Label: OM Attribute_Definition: Organic material in soil (in percent by weight) Attribute_Definition_Source: Created from omh and oml of STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 to 100, missing value indicator = -0.1 Attribute: Attribute_Label: PERM Attribute_Definition: Permeability of the soil (in inches per hour) Attribute_Definition_Source: Created from permh and perml of STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Non-negative real, missing value indicator = -0.1 Attribute: Attribute_Label: THICK Attribute_Definition: Cumulative thickness of all soil layers (in inches) Attribute_Definition_Source: Created from laydeph and laydepl of STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Positive real, missing value indicator = -0.1 Attribute: Attribute_Label: HYGRP Attribute_Definition: Hydrologic characteristics of soil Attribute_Definition_Source: Created from hydgrp item of STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1-4:1=High infiltration,2=Mod infil,3=Slow infil, 4=Very slow infil,-0.1=Miss Attribute: Attribute_Label: DRAIN Attribute_Definition: Soil drainage Attribute_Definition_Source: Created from drainage in STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1-7:1=excess,2=mod excess,3=well,4=mod well, 5=mod poor,6=poor,7=v poor,-.1=miss Attribute: Attribute_Label: SLOPE Attribute_Definition: Surface slope (in percent) Attribute_Definition_Source: Created from slopeh and slopel of STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 to 100, missing value indicator = -0.1 Attribute: Attribute_Label: LL Attribute_Definition: Liquid limit of soil (in percent moisture by weight) Attribute_Definition_Source: Created from llh and lll of STATSGO (10/94) layer file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 to 100, missing value indicator = -0.1 Attribute: Attribute_Label: IFHYDRIC Attribute_Definition: Share of map unit components with hydric soils Attribute_Definition_Source: Created from hydric of STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 to 1 (1=all components hydric), missing value indicator = -0.1 Attribute: Attribute_Label: AFLDFREQ Attribute_Definition: Annual flood frequency Attribute_Definition_Source: Created from item anflood of STATSGO (10/94) component file Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1-4: 1=greater than 50 pct, 2=5 to 50 pct, 3=0 to 5 pct, 4=none, -0.1=missing Overview_Description: Entity_and_Attribute_Overview: The attribute table, USSOILS.MUID_ATTS, contains the following items for each map unit: Label Type Description muid character Map unit identifier (first two characters are the state abbreviation). state character 2-character State abbreviation. awc float Available water capacity (in inches per inch). Computed as a layer thickness weighted average, across soil layers, of a simple average of awch and awcl contained in the STATSGO layer file. Missing value .FALSE. clay float Percent of soil consisting of clay (in percent of material less than 2mm in size). Computed as a layer thickness weighted average, across soil layers, of a simple average of clayh and clayl contained in the STATSGO layer file. Missing value indicator = -0.1. kffact float Actual k factor used in universal soil loss equation to calculate soil loss by water. Computed as a layer thickness weighted average, across soil layers, of the variable kffact contained in the STATSGO layer file. Missing value indicator = -0.1. ll float Liquid limit of soil layer (in percent moisture by weight). Computed as a layer thickness weighted average, across soil layers, of a simple average of llh and lll contained in the STATSGO layer file. Missing value indicator = -0.1. om float Organic material in the soil (in percent by weight). Computed as a layer thickness weighted average, across soil layers, of a simple average of omh and oml contained in the STATSGO layer file. Missing value .FALSE. perm float Permeability of the soil (in inches per hour). Computed as a layer thickness weighted average, across soil layers, of a simple average of permh and perml contained in the STATSGO layer file. Missing value .FALSE. thick float Depth of soil layers (in inches). Computed as the sum of the differences between laydeph and laydepl for each soil layer in the STATSGO layer file. Missing value .FALSE. hygrp float A code identifying the hydrologic characteristics of the soil. The character codes defined in the STATSGO component file are converted into numeric codes according to Bill Battaglin's methods (Battaglin, written communication dated March 8, 1995). The coding transformations are A = 1 (high infiltration, deep soils, well drained to excessively drained sands and gravels), B = 2 (moderate infiltration rates, deep and moderately deep, moderately well and well drained soils with moderately coarse textures), C = 3 (slow infiltration rates, soils with layers impeding downward movement of water, or soils with moderately fine or fine textures), D = 4 (very slow infiltration rates, soils are clayey, have a high water table, or are shallow to an impervious layer), Mixture codes A/D, B/D, and C/D are assigned the value 4. Also, we subselect certain areas and assign values for hygrp based on the area type. Miscellaneous areas (denoted by M in compkind) and labeled as Dumps, and Gullied Land in compname are assigned the hygrp = 2.5 if the hydgrp value is missing. Areas denoted as Pits, Rock Outcrops, Terrace Escarpments, and Urban land with missing hydgrp are assigned a hygrp of 4. See the documentation of the SAS program "setussoils.sas" for additional details. The transformed data are averaged across components using the component percentage as weights. The missing value indicator is - 0.1. drain float A code identifying the quality of soil drainage. The two character code from the STATSGO component file is converted to a numeric value according to the following translation: E = 1 (excessive), SE = 2 (somewhat excessive), W = 3 (well drained), MW = 4 (moderately drained), SP = 5 (somewhat poorly drained), P = 6 (poorly drained), and VP = 7 (very poorly drained). The values are averaged across components using the component percentage as weights. The missing value indicator is -0.1. slope float The slope of the map unit (in percent). Slope values contained in the STATSGO component file are averaged using the component percentage as weights. The missing value indicator is -0.1. ifhydric float Share of map unit with hydric soils (1 = entire map unit has hydric soils). Computed by summing the component percentage for each component designated as having hydric soils according to the variable hydric in the STATSGO component file. Missing value .FALSE. afldfreq float Annual flood frequency code. Flood frequency designations contained in the variable anflood in the STATSGO component file are converted to numeric codes according to the following translation: 1 = greater than 50%, 2 = 5% to 50%, 3 = 0% to 5%, and 4 = no flood. Translated variables are averaged across components using the component percentage as weights. The missing value indicator is -0.1. Entity_and_Attribute_Detail_Citation: not available ATTRIBUTE LISTING FOR:
  • COLUMN ITEM NAME WIDTH OUTPUT TYPE N. DEC ALTERNATE NAME INDEXED?
    1 AREA 4 12 F   -
    5 PERIMETER 4 12 F   -
    9 SP_STATSGO# 4 5 B - -
    13 SP_STATSGO-ID 4 5 B - -
    17 MUID 7 7 C - -
    ** REDEFINED ITEMS **
    19 IDS C - -

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