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STATSGO Metadata - Alaska

		     
                      Identification Information

Citation:
   Originator: U.S. Department of Agriculture, Natural Resource
               Conservation Service
   Publication Date: 1979
   Title: Exploratory Soil Survey of Alaska; STATSGO Publication 
   Publication Place: Fort Worth, Texas
   Publisher: U.S. Department of Agriculture, Natural
              Resource Conservation Service

Description
   Abstract: This data set consists of georeferenced digital map and
   attribute data derived from the publication "Exploratory Soil Survey
   of Alaska". The map is a broad based inventory of soils and nonsoil
   areas that occur in a repeatable pattern on the landscape and that
   can be cartographically shown at the 1:1,000,000 scale.

   The original linework was drawn and verified in the field using 1
   by 3 degree topographic quadrangles as the mapping base. Linework
   from these basemaps was digitized and merged to form a seamless
   statewide coverage. Soil map units are linked to attributes in the
   Map Unit Interpretations Record relational data base which gives the
   proportionate extent of the component soils and their properties.

   Purpose: STATSGO depicts information about soil features on or near
   the surface of the Earth.  These data are collected as part of the
   National Cooperative Soil Survey.

Time Period of Content
   Single Date/Time Calendar Date: 1995 
   Currentness Reference: publication date

Status
   Progress: Complete
   Maintenance and Update Frequency: As needed

Spatial Domain
   Bounding Coordinates
      West Bounding Coordinate: 172.0
      East Bounding Coordinate: -129.0
      North Bounding Coordinate: 72
      South Bounding Coordinate: 51

Keywords
   Theme
      Theme Keyword Thesaurus: None
      Theme Keyword: Soils
      Theme Keyword: General Soils Map 
      Theme Keyword: Exploratory Soil Survey 
      Theme Keyword: State Soil Geographic
      Theme Keyword: STATSGO

   Place
      Place Keyword Thesaurus: Counties and County Equivalents of the
	 United States and the District of Columbia (FIPS Pub 6-3)
      Place Keyword: Alaska (02)

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.

    STATSGO was designed primarily for regional, multicounty, river
    basin, State, and multistate resource planning, management, and
    monitoring.  STATSGO data are not detailed enough to make
    interpretations at a county level.  This soil survey product is not
    designed for use as a primary regulatory tool in permitting or
    citing decisions, but may be used as a reference source.  The use
    of these data is not restricted and may be interpreted by
    organizations, agencies, units of government, or others; however,
    they are responsible for its 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.

    When STATSGO data are overlayed with other data layers, such as
    land use data, caution must be used in generating statistics on the
    co-occurence of the land use data with the soil data.  The
    composition of the STATSGO map unit can be characterized
    independently for the land use and for the soil component, but
    there are no data on their joint occurrence at a more detailed
    level.  Analysis of the overlayed data should be on a map polygon
    basis.

    The minimum area depicted is approximately 10,000 acres.  The total
    number of delineations is 2310. Delineations depict the dominant
    soils making up the landscape.  Other dissimilar soils, too small
    to be delineated, are present within a delineation.

    Digital enlargements 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.

    Attribute data for some data elements may be incomplete or
    missing.  Where data are unavailable, a mask should be used to
    exclude the area from analysis.

    Digital data files are periodically updated. If files are dated
    users are responsible for obtaining the latest version of the
    data.

Point of Contact
   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: 949 E. 36'th Avenue, Suite 400
      City: Anchorage
      State or Province: Alaska
      Postal Code: 99508-4362
    Contact Voice Telephone: 907 271 2424
    Contact Facsimile Telephone: 907 271 3951

		      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 amendments
   and are current as of the date of digitizing.

   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.  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).

   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 to three components. The STATSGO map
   unit components are soil subgroup phases, and their percent
   composition represents the estimated areal proportion of each 
   within STATSGO map unit.  The composition for a map unit is
   generalized to represent the statewide extent of that map unit and
   not the extent of any single map unit delineation.  These
   specifications provide a nationally consistent representation
   of STATSGO attribute data.

   The actual composition and interpretive purity of the map unit
   delineations were based on random transect and remote sensing of
   landforms and vegetation patterns.

   Specific limits were established on the classification of soils and
   the design and name of map units.  These limits are outlined in U.S.
   Department of Agriculture. 1975. 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. 1992. Keys to Soil Taxonomy. SMSS Technical Monograph
   No. 19. Soil Surv.  Staff, Soil Conserv. Serv.; U.S. Department of
   Agriculture.  1993. National Soil Survey Handbook, title 430-VI.
   Soil Surv.  Staff, Soil Conserv. Serv.; and U.S. Department of
   Agriculture. 1993. Soil Survey Manual. Soil Surv. Staff, U.S.  Dep.
   Agric. Handbook 18.

   Adherence to National Cooperative Soil Survey standards and
   procedures is based on peer review, quality control, and quality
   assurance.  Quality control is outlined in documents that reside
   with the Natural Resources Conservation Service state soil
   scientist.

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 map unit boundaries 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, in areas where
      changes in soils, climate, topography, and geology occur subtly
      across a portion of a state, the transition between soil map unit
      boundaries will be gradual.  Where these features change
      abruptly, such as from an area of mountains to a floodplain, the
      transition will be very narrow.  Soil delineation boundaries were
      digitized within 0.01 inches of their locations on the digitizing
      source.

Lineage
   Source Information
      Source Citation
	 Originator: U.S Department of Agriculture, Natural Resources
	             Conservation Service 
         Title: Exploratory Soil Survey of Alaska
	 Geospatial Data Presentation Form: map
      Publication Information
         Publication Place: Washington, D.C.
         Publisher: U.S.Government Printing Office 
         Source Scale Denominator:1,000,000
         Type of Source Media: paper
         Source Currentness Reference: publication date
         Source Time Period of Content: 1979
         Abbreviation: NRCS1
         Source Contribution: base information for development of
         map unit delineations and transect data for naming map units.
      Source Citation
	 Originator: U.S. Geological Survey
         Title: multiple maps
	 Geospatial Data Presentation Form: map
      Publication Information
            Publication Place: Reston, Virginia Publisher: U.S.
            Geological Survey Source Scale Denominator: 250000 
            Type of Source Material: stable-base material
            Source Currentness Reference: unknown
            Source Citation Abbreviation: USGS1
            USGS1 Source Contribution: base materials for compilation of
	    map unit delineation linework 
     Source Citation
	 Originator: U.S Department of Agriculture, Soil Conservation
                     Service
         Title: multiple compiled mylar overlays of map unit delineations,
                unpublished 
         Geospatial Data Presentation Form: annotated overlay 
         Type of Source Media: stable-base material
         Source Currentness Reference: unknown 
         Source Citation Abbreviation:  NRCS2
         Source Contribution: digitizing source

   Process Step
      Process Description: Map unit composition was determined by
               referencing the narrative map unit descriptions in the
               "Exploratory Soil Survey of Alaska".
      Source Used Citation Abbreviation: NRCS1
      Process Date: 1994

   Process Step
      Process Description: Soil map unit lines and symbols were drafted
      in red pencil on a mylar overlay that was punch registered to fit
      the mylar USGS 1:250,000-scale topographic quadrangle.  A
      detailed and complete edit was performed on all overlays before
      digitizing.  The soil delineation overlays were raster scanned at
      a scanning resolution of at least 0.01 inches and converted to a
      vector format or were manually digitized on a digitizing tablet
      with a resolution of at least 0.001 inches.  Four control points
      corresponding to the four corners of the quadrangles were used
      for registration during data collection.  The control points were
      either explicitly entered or developed by the software.  The data
      sets were edge matched and merged into statewide coverages.  A
      detailed and complete edit was performed on all digital data.
      Source Used Citation Abbreviation: USGS1, NRCS2 
      Process Date: 1994

Spatial Data Organization Information

   Direct Spatial Reference Method: Vector

Spatial Reference Information

   Horizontal Coordinate System Definition

   Planar Grid Coordinate System Name: Albers Conical Equal Area
         Standard Parallel 1: 55
         Standard Parallel 2: 65
         Longitude of Central Meridian: -154 
         Latitude of Projection Origin: 50.0
         False Easting: 0.0
         False Northing: 0.0
   Planar Coordinate Information
	 Planar Coordinate Encoding Method: coordinate pair
   Coordinate Representation
        Abscissa Resolution: 6.35
        Ordinate Resolution: 6.35 
        Distance Units: meters 
   Geodetic Model
        Horizontal Datum Name: North American Datum of 1927 Ellipsoid
        Name: Clarke 1866
        Semi-major Axis: 6378206.4 
        Denominator of Flattening Ratio: 294.9786982

Entity and Attribute Information

Overview Description

   Entity and Attribute Overview: Map Unit Delineations are closed
   polygons that are generally geographic mixtures of groups of soils
   or soils and nonsoil areas.

   The map unit ID uniquely identifies each closed delineation, map
   unit.  Each map unit ID is linked to a map unit name.  The map unit
   ID is also the key for linking information in the Map Unit
   Interpretations Record tables.

   Map Unit Delineations are described by the Map Unit Interpretations
   Record data base.  This attribute data base gives the proportionate
   extent of the component soils and the properties for each soil.  The
   data base 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 Soil Map Unit Interpretations
   Record data base consist of the following relational tables:

      codes (data base codes) - stores information on all codes
	 used in the data base
      comp (map unit component) - stores information which will
	 apply to a specific component of a soil map unit
      compyld(component crop yield) - stores crop yield
	 information for soil map unit components
      forest (forest understory) - stores information for plant
	 cover as forest understory for soil map unit components 
      interp(interpretation) - stores soil interpretation ratings 
        (both limitation ratings and suitability ratings) to
	 soil map unit components 
      layer (soil layer) - stores characteristics which apply to
	 soil layers for soil map unit components
      mapunit (map unit) - stores information which applies to
	 all components of a soil map unit 
      plantcom (plant composition) - stores plant symbols and
	 percent of plant composition associated with components of
	 soil map units
      plantnm (plant name) - stores the common and scientific
	 names for plants used in the data base
      rsprod (range site production) - stores range site
	 production information for soil map unit components
      taxclass (taxonomic classification) - stores the taxonomic
	 classification for soils in the data base
      windbrk (windbreak)- stores information on recommended
	 windbreak plants for soil map unit components
      wlhabit(wildlife habitat) - stores wildlife habitat
	 information for soil map unit components
      woodland (woodland) - stores information on common indicator
	 trees for soil map unit components
      woodmgt (woodland management) - stores woodland management
	 information for soil map unit components
      yldunits (yield units) - stores crop names and the units
	 used to measure yield.

   Entity and Attribute Detail Citation
      U.S. Department of Agriculture. 1975. 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. 1992. Keys to Soil Taxonomy.
      SMSS Technical Monograph No. 19. Soil Surv. Staff, Soil Conserv.
      Serv.

      U.S. Department of Agriculture. 1993. National Soil Survey
      Handbook, title 430-VI. Soil Surv. Staff, Soil Conserv. Serv.

      U.S. Department of Agriculture. 1993. Soil Survey Manual.  Soil
      Surv. Staff, U.S. Dep. Agric. Handbook 18.

      U.S. Department of Agriculture. 1994. State Soil Geographic
      (STATSGO) Data Base: Data use information. Soil Conserv. Serv.

      U.S. Department of Agriculture. State Soil Survey Database Data
      Dictionary. Soil Conserv. Serv.

		     Distribution Information

Distributor
   Contact Organization Primary
      Contact Organization: U.S. Department of Agriculture, Soil
	 Conservation Service, National Cartography and GIS Center
      Contact Address
         Address Type: mailing address
         Address: P.O. Box 6567 
         City: Fort Worth
         State or Province: Texas
         Postal Zone: 76115
         Contact Voice Telephone: 817 334 5559
         Contact Facsimile Telephone: 817 334 5469

Resource Description: Alaska STATSGO

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.  It is also not liable for damage,
   transmission of viruses, or computer contamination through the
   distribution of these data sets.  The U.S.  Department of
   Agriculture prohibits discrimination in its programs on the basis of
   race, color, national origin, sex, religion, age, disability,
   political beliefs, and marital or familial status.  (Not all
   prohibited bases apply to all programs.)

Standard Order Process
   Non-digital Form: Not available 
   Digital Form
      Digital Transfer Information
         Format Name: DLG
         Format Date: 19960101
         Format Specification:
	 Optional Format Content Information: spatial and keys
         Transfer Size: 13 megabytes
   Digital Form
      Digital Transfer Information
	 Format Name: ASCII
         Format Content Information: keys and attributes
         Transfer Size:  unknown 
   Digital Form
      Digital Transfer Information
	 Format Name: ARCE 
         Format Content Information: spatial, keys, and attributes
      Format Specification: Single precision Transfer
	 Size:  unknown
   Digital Transfer Option
      Offline Option
	 Offline Media: 8mm cartridge tape Recording Capacity
	    Recording Density: 2.3 Recording Density Units: gigabytes
	    Recording Format: tar
   Digital Transfer Option
      Offline Option
	 Offline Media: 1/4-inch cartridge tape Recording Capacity
	    Recording Density: 150 Recording Density Units: megabytes
	    Recording Format: tar

   Fees: The charge for one data set is $500.00.  A data set is one
   state in a state-wide format and includes both spatial and attribute
   data.

   Ordering Instructions: Call or write to organizations listed under
   Distributor.  Spatial line data are in DLG-3 optional or ARC Export
   formats.  Digital line graph files contain major and minor code
   pairs in area and line records.  A conversion legend is provided for
   each digital line graph file.  Map unit IDs are available in a
   companion ASCII attribute file.  The Map Unit Interpretations Record
   attribute soil data are available in variable length, tab delimited,
   ASCII or ARC Export files.

   Turnaround: 10 working days

		     Metadata Reference Information

   Metadata Date:1/29/96
   Metadata Review Date:1/96
   Metadata Future Review Date: as needed
   Metadata Contact: State Soil Scientist
   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: 949 E. 36'th, Suite 400
      City: Anchorage
      State or Province:Alaska
      Postal Code: 99508-4362
   Contact Voice Telephone: 907-271-2424
   Metadata Standard Name: Content Standards for Digital Geospatial
   Metadata Metadata Standard Version:

This information is being shared as a prototype and may not reflect current updates to the database.


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