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 |
- |
|
- |