Soil Survey Geographic (SSURGO) database for Accomack County, Virginia

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 20041007
Title:
Soil Survey Geographic (SSURGO) database for Accomack County, Virginia
Publication_Information:
Publication_Place: Fort Worth, Texas
Publisher: U.S. Department of Agriculture, Natural Resources Conservation Service
Other_Citation_Details:
va001
Online_Linkage: URL:http://SoilDataMart.nrcs.usda.gov/
Description:
Abstract:
This data set is a digital soil survey and generally is the most
detailed level of soil geographic data developed by the National
Cooperative Soil Survey. The information was prepared by digitizing
maps, by compiling information onto a planimetric correct base
and digitizing, or by revising digitized maps using remotely
sensed and other information.

This data set consists of georeferenced digital map data and
computerized attribute data. The map data are in a 7.5 minute
quadrangle format and include a detailed, field verified inventory
of soils and nonsoil areas that normally occur in a repeatable
pattern on the landscape and that can be cartographically shown at
the scale mapped. A special soil features layer (point and line
features) is optional. This layer displays the location of features
too small to delineate at the mapping scale, but they are large
enough and contrasting enough to significantly influence use and
management. The soil map units are linked to attributes in the
National Soil Information System relational database, which gives
the proportionate extent of the component soils and their properties.
Purpose:
SSURGO depicts information about the kinds and distribution of
soils on the landscape. The soil map and data used in the SSURGO
product were prepared by soil scientists as part of the National
Cooperative Soil Survey.
Supplemental_Information:
Digital versions of hydrography, cultural features, and other
associated layers that are not part of the SSURGO data set may be
available from the primary organization listed in the Point of
Contact.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19990427
Ending_Date: 20041007
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.125
East_Bounding_Coordinate: -75.125
North_Bounding_Coordinate: 38.125
South_Bounding_Coordinate: 37.375
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: soil survey
Theme_Keyword: soils
Theme_Keyword: Soil Survey Geographic
Theme_Keyword: SSURGO
Place:
Place_Keyword_Thesaurus: Counties and County Equivalents of the States of the United States and the District of Columbia (FIPS Pub 6-3)
Place_Keyword: Virginia
Place:
Place_Keyword_Thesaurus: Counties and County Equivalents of the States of the United States and the District of Columbia (FIPS Pub 6-3)
Place_Keyword: Accomack County
Place:
Place_Keyword_Thesaurus: USGS Topographic Map Names Data Base
Place_Keyword: Pocomoke City Quadrangle (s3807560)
Place_Keyword: Girdletree Quadrangle (s3807561)
Place_Keyword: Boxiron Quadrangle (s3807562)
Place_Keyword: Whittington Point Quadrangle (s3807563)
Place_Keyword: Ewell Quadrangle (s3707608)
Place_Keyword: Great Fox Island Quadrangle (s3707501)
Place_Keyword: Crisfield Quadrangle (s3707502)
Place_Keyword: Saxis Quadrangle (s3707503)
Place_Keyword: Hallwood Quadrangle (s3707504)
Place_Keyword: Chincoteague West Quadrangle (s3707505)
Place_Keyword: Chincoteague East Quadrangle (s3707506)
Place_Keyword: Goose Island Quadrangle (s3707616)
Place_Keyword: Tangier Island Quadrangle (s3707509)
Place_Keyword: Chesconessex Quadrangle (s3707510)
Place_Keyword: Parksley Quadrangle (s3707511)
Place_Keyword: Bloxom Quadrangle (s3707512)
Place_Keyword: Wallops Island Quadrangle (s3707513)
Place_Keyword: Chincoteague East OE S Quadrangle (s3707514)
Place_Keyword: Nandua Creek Quadrangle (s3707517)
Place_Keyword: Pungoteague Quadrangle (s3707518)
Place_Keyword: Accomac Quadrangle (s3707519)
Place_Keyword: Metompkin Inlet Quadrangle (s3707520)
Place_Keyword: Jamesville Quadrangle (s3707525)
Place_Keyword: Exmore Quadrangle (s3707526)
Place_Keyword: Wachapreague Quadrangle (s3707527)
Place_Keyword: Wachapreague OE E Quadrangle (s3707528)
Place_Keyword: Nassawadox Quadrangle (s3707534)
Place_Keyword: Quinby Inlet Quadrangle (s3707535)
Access_Constraints: None
Use_Constraints:
The U.S. Department of Agriculture, Natural Resources Conservation
Service, should be acknowledged as the data source in products
derived from these data.

This data set is not designed for use as a primary regulatory tool
in permitting or citing decisions, but may be used as a reference
source. This is public information and may be interpreted by
organizations, agencies, units of government, or others based on
needs; however, they are responsible for the appropriate
application. Federal, State, or local regulatory bodies are not to
reassign to the Natural Resources Conservation Service any
authority for the decisions that they make. The Natural Resources
Conservation Service will not perform any evaluations of these maps
for purposes related solely to State or local regulatory programs.

Photographic or digital enlargement of these maps to scales greater
than at which they were originally mapped can cause misinterpretation
of the data. If enlarged, maps do not show the small areas of
contrasting soils that could have been shown at a larger scale. The
depicted soil boundaries, interpretations, and analysis derived from
them do not eliminate the need for onsite sampling, testing, and
detailed study of specific sites for intensive uses. Thus, these data
and their interpretations are intended for planning purposes only.
Digital data files are periodically updated. Files are dated, and
users are responsible for obtaining the latest version of the data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Department of Agriculture, Natural Resources Conservation Service
Contact_Position: State Soil Scientist
Contact_Address:
Address_Type: mailing address
Address:
1606 Santa Rosa Road
Address:
Suite 209
City: Richmond
State_or_Province: VA
Postal_Code: 23229
Contact_Voice_Telephone: 804-287-1646
Contact_TDD/TTY_Telephone: (202) 720-2600
Contact_Facsimile_Telephone: 804-287-1736
Contact_Electronic_Mail_Address: david.kriz@va.usda.gov
Cross_Reference:
Citation_Information:
Originator: U.S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 1994
Title:
Soil Survey of Accomack County, Virginia
Geospatial_Data_Presentation_Form: text, table, map
Other_Citation_Details:
This soil survey contains information that can be applied in managing farms and wetlands; in selecting sites for roads, ponds, buildings, and other structures; and in judging the suitability of tracts of land for farming, industry, and recreation. This soil survey depicts information about the kinds and distribution of soils on the landscape. The soil map and data used in the SSURGO product were prepared by soil scientists as part of the National Cooperative Soil Survey.
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy is tested by manual
comparison of the source with hard copy plots and/or symbolized
display of the map data on an interactive computer graphic system.
Selected attributes that cannot be visually verified on plots or
on screen are interactively queried and verified on screen. In
addition, the attributes are tested against a master set of valid
attributes. All attribute data conform to the attribute codes in
the signed classification and correlation document and amendment(s).
Logical_Consistency_Report:
Certain node/geometry and topology GT- polygon/chain relationships
are collected or generated to satisfy topological requirements
(the GT-polygon corresponds to the soil delineation). Some of these
requirements include: chains must begin and end at nodes, chains
must connect to each other at nodes, chains do not extend through
nodes, left and right GT-polygons are defined for each chain
element and are consistent throughout, and the chains representing
the limits of the file (neatline) are free of gaps. The tests of
logical consistency are performed using vendor software. The
neatline is generated by connecting the explicitly entered four
corners of the digital file. All data outside the enclosed region
are ignored and all data crossing these geographically straight
lines are clipped at the neatline. Data within a specified tolerance
of the neatline are snapped to the neatline. Neatline straightening
aligns the digitized edges of the digital data with the generated
neatline (i.e., with the longitude/latitude lines in geographic
coordinates). All internal polygons are tested for closure with
vendor software and are checked on hard copy plots. All data are
checked for common soil lines (i.e., adjacent polygons with the
same label). Quadrangles are edge matched within the soil survey
area and edge locations generally do not deviate from centerline to
centerline by more than 0.01 inch. The quadrangles in this survey are
not edge matched to quadrangles in Northampton County, Virginia,
and Worcester County, Maryland.
Completeness_Report:
A map unit is a collection of areas defined and named the same in
terms of their soil and/or nonsoil areas. Each map unit differs
in some respect from all others in a survey area and is uniquely
identified. Each individual area is a delineation. Each map unit
consists of one or more components.

Soil scientists identify small areas of soils or miscellaneous
(nonsoil) areas that have properties and behavior significantly
different than the named soils in the surrounding map unit. These
minor components may be indicated as special features. If they
have a minimal effect on use and management, or could not be
precisely located, they may not be indicated on the map.

Specific National Cooperative Soil Survey standards and procedures
were used in the classification of soils, design and name of map
units, and location of special soil features. These standards are
outlined in Agricultural Handbook 18, Soil Survey Manual, 1993,
USDA, SCS; Agricultural Handbook 436, Soil Taxonomy, Soil Survey
Staff, 1975, USDA, SCS; and all Amendments; Keys to Soil Taxonomy,
Soil Survey Staff, (current issue); National Soil Survey
Handbook, title 430-VI, (current issue).

The actual composition and interpretive purity of the map unit
delineations were based on data collected by scientists during
the course of preparing the soil maps. Adherence to National
Cooperative Soil Survey standards and procedures is based on
peer review, quality control, and quality assurance. Quality
control is outlined in the memorandum of understanding for the
soil survey area and in documents that reside with the Natural
Resources Conservation Service state soil scientist. Four kinds
of map units are used in soil surveys: consociations, complexes,
associations, and undifferentiated groups.

Consociations - Consociations are named for the dominant soil. In
a consociation, delineated areas are dominated by a single soil
taxon and similar soils. At least one half of the pedons in each
delineation are of the same soil component so similar to the
named soil that major interpretations are not affected
significantly. The total amount of dissimilar inclusions of
other components in a map unit generally does not exceed about
15 percent if limiting and 25 percent if nonlimiting. A single
component of a dissimilar limiting inclusion generally does not
exceed 10 percent if very contrasting.

Complexes and associations - Complexes and associations are named
for two or more dissimilar components with the dominant component
listed first. They occur in a regularly repeating pattern. The major
components of a complex cannot be mapped separately at a scale of
about 1:24,000. The major components of an association can be
separated at a scale of about 1:24,000. In each delineation of
either a complex or an association, each major component is normally
present, though their proportions may vary appreciably from one
delineation to another. The total amount of inclusions in a map unit
that are dissimilar to any of the major components does not exceed
15 percent if limiting and 25 percent if nonlimiting. A single kind
of dissimilar limiting inclusion usually does not exceed 10 percent.

Undifferentiated groups - Undifferentiated groups consist of two
or more components that do not always occur together in the same
delineation, but are included in the same named map unit because
use and management are the same or similar for common uses. Every
delineation has at least one of the major components and some may
have all of them. The same principles regarding proportion of
inclusions apply to undifferentiated groups as to consociations.

Minimum documentation consists of three complete soil profile
descriptions that are collected for each soil added to the legend,
one additional per 3,000 acres mapped; three 10 observation
transects for each map unit, one additional 10 point transect per
3,000 acres.

A defined standard or level of confidence in the interpretive
purity of the map unit delineations is attained by adjusting the
kind and intensity of field investigations. Field investigations
and data collection are carried out in sufficient detail to name
map units and to identify accurately and consistently areas of
about 6 acres.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The accuracy of these digital data is based upon their
compilation to base maps that meet National Map Accuracy
Standards. The difference in positional accuracy between the
soil boundaries and special soil features locations in the
field and their digitized map locations is unknown. The
locational accuracy of soil delineations on the ground varies
with the transition between map units.

For example, on long gently sloping landscapes the transition
occurs gradually over many feet. Where landscapes change
abruptly from steep to level, the transition will be very
narrow. Soil delineation boundaries and special soil features
generally were digitized within 0.01 inch of their locations on
the digitizing source. The digital map elements are edge matched
between data sets. The data along each quadrangle edge are
matched against the data for the adjacent quadrangle. Edge
locations generally do not deviate from centerline to centerline
by more than 0.01 inch.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1974-1986
Title:
multiple 7.5 minute topographic quadrangles
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geologic Survey
Source_Scale_Denominator: 15840
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1998
Ending_Date: 1999
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
USGS1
Source_Contribution:
base materials for compilation and
as reference in compilation of cultural features
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 1994
Title:
Soil Survey of Accomack County, Virginia
Geospatial_Data_Presentation_Form: atlas
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: U.S. Government Printing Office
Source_Scale_Denominator: 15840
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1998
Ending_Date: 1999
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
SCS1
Source_Contribution:
information for soil mapunit
delineations, soil symbols and special
soil features
Source_Information:
Source_Citation:
Citation_Information:
Originator: Natural Resources Conservation Service
Publication_Date: unpublished material
Title:
annotated overlay
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 15840
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1998
Ending_Date: 1999
Source_Currentness_Reference:
1999
Source_Citation_Abbreviation:
NRCS1
Source_Contribution:
digitizing source
Source_Information:
Source_Citation:
Citation_Information:
Originator: Commonwealth of Virginia, Department of Conservation and Recreation
Publication_Date: unpublished material
Title:
jurisdictional boundary layer
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 24000
Type_of_Source_Media: cartridge tape
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
1997
Source_Citation_Abbreviation:
DCR1
Source_Contribution:
source material for soil survey boundary
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 1999
Title:
Soil Geographic (SSURGO) database for Accomack County, Virginia
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Fort Worth, Texas
Publisher: U.S. Department of Agriculture, Natural Resources Conservation Service, National Cartography and Geospatial Center
Source_Scale_Denominator: 15840
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Source_Currentness_Reference:
1999
Source_Citation_Abbreviation:
NRCS2
Source_Contribution:
SSURGO data for revision of attribute data
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Department of Agriculture, Natural Resources Conservation Service
Publication_Date: 2004
Title:
National Soil Information System (NASIS) data base
Geospatial_Data_Presentation_Form: unknown
Publication_Information:
Publication_Place: Fort Collins, Colorado
Publisher: U.S. Department of Agriculture, Natural Resources Conservation Service
Type_of_Source_Media: database
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2004
Ending_Date: 2004
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
NASIS
Source_Contribution:
attribute (tabular) information
Process_Step:
Process_Description:
Accomack County, Virginia, had a previously published
soil survey, 1994, at 1:15,840 scale.  An evaluation was made of
the soil survey in 1998.  It was determined that the soil map
unit delineations and map unit components were accurate.
Source_Used_Citation_Abbreviation:
SCS1
Process_Date: 1998
Process_Step:
Process_Description:
The soil map unit delineations and were manually compiled to an
overlay registered to USGS 7.5 minute topographic quadrangles.
The soil map unit delineations overlays were raster
scanned at a resolution of 200 dpi.  The processing, raster editing,
map neatline development, labeling, edge matching and vector
conversion and editing were done in LT4X Version 4.10.  The data
were created and maintained in North American Datum of 1927.  The
data were written to Digital Line Graph Optional format with the
export command.  The data were imported for verification in
ARC/INFO 7.1.2.  The digitized soil survey boundary was replaced
with the statewide jurisdictional boundary from the Virginia
Department of Conservation and Recreation using arctools.
New DLGs reflecting these changes were written with ARC/INFO 7.1.2.
Compilation, digitizing and quality control were done by Natural
Resources Conservation Service staff in Virginia.
Source_Used_Citation_Abbreviation:
SCS1, USGS1, NRCS1, DCR1
Process_Date: 1999
Process_Step:
Process_Description:
The Map Unit Interpretations Record data base was developed
by Natural Resources Conservation Service soil scientists
according to national standards.
Source_Used_Citation_Abbreviation:
NRCS1
Process_Date: 1999
Process_Step:
Process_Description:
The National Soil Information System data base was
developed by Natural Resources Conservation Service
soil scientists according to national standards.
Source_Used_Citation_Abbreviation:
NRCS1
Process_Date: 2002
Process_Step:
Process_Description:
The online SSURGO data were imported to ARC/INFO 7.2.1 at the
Natural Resources Conservation Service, Virginia Digitizing Unit.
The SSURGO data were processed through revised AMLs dated
October 1998. Minor codes were replaced to link spatial data
map unit labels to the National Soil Information System data
base. New DLG-3s were written. The data were forwarded to the
National Cartography and Geospatial Center in Ft. Worth, Texas
for archiving and distribution.
Source_Used_Citation_Abbreviation:
NRCS2
Process_Date: 2002
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate, upon completion of data quality verification, determined
that the tabular data should be released for official use. A
selected set of map units and components in the soil survey legend was
copied to a staging database, and rating values for selected
interpretations were generated. The list of selected interpretations is
stored in the database table named sainterp.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20040701
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate verified that the labels on the digitized soil map units
link to map units in the tabular database, and certified the joined
data sets for release to the Soil Data Warehouse. A system assigned
version number and date stamp were added and the data were copied to
the data warehouse. The tabular data for the map units and components
were extracted from the data warehouse and reformatted into the soil
data delivery data model, then stored in the Soil Data Mart. The spatial
data were copied to the Soil Data Mart without change.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20040701
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate, upon completion of data quality verification, determined
that the tabular data should be released for official use. A
selected set of map units and components in the soil survey legend was
copied to a staging database, and rating values for selected
interpretations were generated. The list of selected interpretations is
stored in the database table named sainterp.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20040916
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate verified that the labels on the digitized soil map units
link to map units in the tabular database, and certified the joined
data sets for release to the Soil Data Warehouse. A system assigned
version number and date stamp were added and the data were copied to
the data warehouse. The tabular data for the map units and components
were extracted from the data warehouse and reformatted into the soil
data delivery data model, then stored in the Soil Data Mart. The spatial
data were copied to the Soil Data Mart without change.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20040916
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate, upon completion of data quality verification, determined
that the tabular data should be released for official use. A
selected set of map units and components in the soil survey legend was
copied to a staging database, and rating values for selected
interpretations were generated. The list of selected interpretations is
stored in the database table named sainterp.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20041007
Process_Step:
Process_Description:
The Natural Resources Conservation Service State Soil Scientist or
delegate verified that the labels on the digitized soil map units
link to map units in the tabular database, and certified the joined
data sets for release to the Soil Data Warehouse. A system assigned
version number and date stamp were added and the data were copied to
the data warehouse. The tabular data for the map units and components
were extracted from the data warehouse and reformatted into the soil
data delivery data model, then stored in the Soil Data Mart. The spatial
data were copied to the Soil Data Mart without change.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20041007
Process_Step:
Process_Description:
The tabular data were extracted from the data mart without change. The spatial data's coordinate system was transformed to UTM Zone 18, Northern Hemisphere (NAD 83) using ESRI ArcObjects 8.3 "ConvertFeatureClass" and exported to an ESRI shapefile.
Source_Used_Citation_Abbreviation:
NASIS
Process_Date: 20050315
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000128
Ordinate_Resolution: 0.000128
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Special Soil Features
Entity_Type_Definition:
Special Soil Features represent soil, nonsoil, or landform features that are too small to be digitized as soil delineations (area features).
Entity_Type_Definition_Source:
U.S. Department of Agriculture. 1993. Soil Survey Manual. Soil Surv. Staff, U.S. Dep. Agric. Handb. 18.
Attribute:
Attribute_Label: Special Soil Features Codes
Attribute_Definition:
Special Soil Features Codes represent specific Special Soil
Features. These features are identified with a major code,
a minor code, and a descriptive label. The codes and label
are assigned to the point or line assigned to represent the
feature on published maps.
Attribute_Definition_Source:
U.S. Department of Agriculture. 1993. Soil Survey Manual.
Soil Surv. Staff, U.S. Dep. Agric. Handb. 18; U.S. Department
of Agriculture. (current issue). National Soil Survey
Handbook, title 430-VI, part 647. Soil Conserv. Serv.
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Classification and Correlation of the Soils of Accomack County, Virginia
Codeset_Source: U.S. Department of Agriculture, Natural Resources Conservation Service
Overview_Description:
Entity_and_Attribute_Overview:
Map Unit Delineations are closed polygons that may be dominated
by a single soil or nonsoil component plus allowable similar or
dissimilar soils, or they can be geographic mixtures of groups
of soils or soils and nonsoil areas.

The map unit symbol uniquely identifies each closed delineation
map unit. Each symbol is linked to a map unit name. The map unit
symbol is also the key for linking information in the National Soil
Information System tables. The map unit symbols are not carried
within the modified Digital Line Graph file; however, they are made
available in a companion attribute file. The attribute file links
the minor codes in the Digital Line Graph files to the map unit
symbols.

Map Unit Delineations are described by the National Soil
Information System database. This attribute database gives the
proportionate extent of the component soils and the properties for
each soil. The database contains both estimated and measured data
on the physical and chemical soil properties and soil
interpretations for engineering, water management, recreation,
agronomic, woodland, range, and wildlife uses of the soil.

The National Soil Information System database contains static
metadata. It documents the data structure and includes such
information as what tables, columns, indexes, and relationships
are defined as well as a variety of attributes of each of these
database objects.  Attributes include table and column
descriptions and detailed domain information.

The National Soil Information System database also contains a
distribution metadata. It records the criteria used for selecting
map units and components for inclusion in the set of distributed
data.
Entity_and_Attribute_Detail_Citation:
U.S. Department of Agriculture. 1999. Soil Taxonomy: A basic system
of soil classification for making and interpreting soil surveys.
Soil Conserv. Serv., U.S. Dep. Agric. Handb. 436.

U.S. Department of Agriculture. (current issue). Keys to Soil
Taxonomy.  Soil Surv. Staff, Soil Conserv. Serv.

U.S. Department of Agriculture. (current issue). National Soil
Survey Handbook, title 430-VI. Soil Surv. Staff, Natural Resources
Conservation Service.

U.S. Department of Agriculture. 1993. Soil Survey Manual.
Soil Surv. Staff, U.S. Dep. Agric. Handb. 18.
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Department of Agriculture, Natural Resources Conservation Service, National Cartography and Geospatial Center
Contact_Address:
Address_Type: mailing address
Address:
P.O. Box 6567
City: Fort Worth
State_or_Province: Texas
Postal_Code: 76115
Contact_Voice_Telephone: 800 672 5559
Contact_Facsimile_Telephone: 817 509 3469
Resource_Description: Accomack County, Virginia SSURGO
Distribution_Liability:
Although these data have been processed successfully on a computer
system at the U.S. Department of Agriculture, no warranty expressed
or implied is made by the Agency regarding the utility of the data
on any other system, nor shall the act of distribution constitute
any such warranty. The U.S.  Department of Agriculture will warrant
the delivery of this product in computer readable format, and will
offer appropriate adjustment of credit when the product is determined
unreadable by correctly adjusted computer input peripherals, or
when the physical medium is delivered in damaged condition. Request
for adjustment of credit must be made within 90 days from the date
of this shipment from the ordering site.

The U.S. Department of Agriculture, nor any of its agencies are
liable for misuse of the data, for damage, for transmission of
viruses, or for computer contamination through the distribution of
these data sets. The U.S. Department of Agriculture (USDA) prohibits
discrimination in all its programs and activities on the basis of race,
color, national origin, sex, religion, age, disability, political
beliefs, sexual orientation, or marital or family status. (Not all
prohibited bases apply to all programs.)
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcView shapefile
Format_Information_Content:
spatial
File_Decompression_Technique: WinZip or equivalent
Transfer_Size: 10.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: URL:http://SoilDataMart.nrcs.usda.gov/
Access_Instructions:
Select desired survey area at above Internet Web site. An email address is required for receipt of instructions on retrieval via anonymous FTP. Anticipate a delay between submission of request at Web site and receipt of email message.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO coverage
Format_Information_Content:
spatial
File_Decompression_Technique: WinZip or equivalent
Transfer_Size: 10.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: URL:http://SoilDataMart.nrcs.usda.gov/
Access_Instructions:
Select desired survey area at above Internet Web site. An email address is required for receipt of instructions on retrieval via anonymous FTP. Anticipate a delay between submission of request at Web site and receipt of email message.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO interchange file
Format_Information_Content:
spatial
File_Decompression_Technique: WinZip or equivalent
Transfer_Size: 10.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: URL:http://SoilDataMart.nrcs.usda.gov/
Access_Instructions:
Select desired survey area at above Internet Web site. An email address is required for receipt of instructions on retrieval via anonymous FTP. Anticipate a delay between submission of request at Web site and receipt of email message.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Information_Content:
keys and attributes
File_Decompression_Technique: WinZip or equivalent
Transfer_Size: 3.8
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: URL:http://SoilDataMart.nrcs.usda.gov/
Access_Instructions:
Select desired survey area at above Internet Web site. An email address is required for receipt of instructions on retrieval via anonymous FTP. Anticipate a delay between submission of request at Web site and receipt of email message.
Fees: There is currently no direct charge for requesting data or for retrieval via FTP.
Ordering_Instructions:
Visit the above mentioned Internet Web Site, select state or 
territory, then select individual soil survey area of interest. 
Spatial line data and locations of special feature symbols are in 
ESRI ArcGIS (ArcView,ArcInfo) shapefile, coverage and interchange 
(i.e., export) formats. The National Soil Information System 
attribute soil data are available in variable length, pipe 
delimited, ASCII file format.
Turnaround: Typically within four hours
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Metadata_Reference_Information:
Metadata_Date: 20050315
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Department of Agriculture, Natural Resources Conservation Service
Contact_Position: State Soil Scientist
Contact_Address:
Address_Type: mailing address
Address:
1606 Santa Rosa Road
Address:
Suite 209
City: Richmond
State_or_Province: VA
Postal_Code: 23229
Contact_Voice_Telephone: 804-287-1646
Contact_TDD/TTY_Telephone: (202) 720-2600
Contact_Facsimile_Telephone: 804-287-1736
Contact_Electronic_Mail_Address: david.kriz@va.usda.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
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