Wyoming Geographic Coordinate Data Base (GCDB)

---

Metadata:

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Bureau of Land Management (BLM), Wyoming Office.

Publication_Date: 20000525

Title: Wyoming Geographic Coordinate Data Base (GCDB)

Geospatial_Data_Presentation_Form: Vector Digital Data

Publication_Information:

Publication_Place: Cheyenne, Wyoming

Publisher: U.S. Bureau of Land Management

 

Description:

Wyoming Geographic Coordinate Data Base (GCDB)

---

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Bureau of Land Management (BLM), Wyoming Office.

Publication_Date: 20000525

Title: Wyoming Geographic Coordinate Data Base (GCDB)

Geospatial_Data_Presentation_Form: Vector Digital Data

Publication_Information:

Publication_Place: Cheyenne, Wyoming

Publisher: U.S. Bureau of Land Management

 

Description:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Branch of Cadastral Survey

Contact_Person: Milbert Krohn

Contact_Position: GCDB Specialist

Contact_Address:

Address_Type: mailing

Address: 5353 Yellowstone Avenue PO 1828

City: Cheyenne

State_or_Province: WY

Postal_Code: 82009-1828

Contact_Voice_Telephone: (307) 775-6225

Contact_Facsimile_Telephone: (307) 775-6173

Contact_Electronic_Mail_Address: Milbert_Krohn@blm.gov

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

100% of the data was checked for attribute accuracy by the GCDB personnel in the BLM State Office.

Logical_Consistency_Report:

Data set is topologically structured polygon data with nodes at all intersections. All polygons are attributed.

Completeness_Report:

All GCDB spatial outputs are visually inspected for completeness to ensure that all survey data for a given geographic area is included in the data set.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Accuracy of the individual points contained within the GCDB were adjusted using a least squares analysis, which examines the geometry of PLSS parcels in relation to the coordinate values of known locations for control points within the PLSS grid. Each individual point carries a reliability factor indicating the absolute error of each node.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Bureau of Land Management

Publication_Date: 20000425

Title: Geographic Coordinate Database (GCDB)

Geospatial_Data_Presentation_Form: Tabular Digital Data

Publication_Information:

Publication_Place: Cheyenne, Wyoming

Publisher: U.S. Bureau of Land Management

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 18490303

Ending_Date: present

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: BLM

Source_Contribution:

Official Survey data in the form of microfilmed survey records for the entire history of the General Land Office (GLO) and BLM, abstracted into a digital format.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Forest Service

Publication_Date: 19980601

Title: Automated Lands Project (ALP)

Geospatial_Data_Presentation_Form: Tabular digital data

Publication_Information:

Publication_Place: Washington, D.C.

Publisher: U.S. Forest Service

Type_of_Source_Media: disc

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19980601

Ending_Date: present

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: USFS

Source_Contribution:

Survey and control data from the Cartographic Feature File data set and USFS 7.5 minute quadrangle series.

Process_Step:

Process_Description:

Compile survey input data from official GLO, BLM, or USFS survey plats and any available local survey plats that have been officially recorded with a given County.

Source_Used_Citation_Abbreviation:

BLM Data Base of the Index to all microfilmed BLM Survey Records

Source_Used_Citation_Abbreviation: U.S. Forest Service Survey Records.

Process_Date: Unknown

Process_Step:

Process_Description:

Compile listings of known locations of PLSS corners.

Source_Used: USGS 1/24,000 series quadrangles

Source_Used: USFS 1/24,000 series quadrangles

Source_Used: US Coast & Geodetic Survey published coordinate data

Source_Used: NGS published coordinate data

Source_Used: BLM Global Positioning Data

Source_Used: USFS Global Positioning Data

Source_Used: Wyoming Department of Transportation (WYDOT) Geodetic Control Network Data.

Process_Date: Unknown

Process_Step:

Process_Description:

Coordinates of control stations are entered into a control data base with associated reliabilities.

Process_Date: Unknown

Process_Step:

Process_Description:

Survey data abstracted from survey plats, and control stations extracted from control data base, are manually entered into the Coordinate Geometry (COGO) software PCCS or GMM. A succession of compass rule adjustments is performed on the survey data to adjust them to the control points, followed by an averaging of over-computed points in PCCS or a parametric least squares adjustment in GMM. The resulting coordinates are accompanied by indications of positional accuracy estimates for three processes: PCCS - The average and maximum misclosure in the township. GMM - X/Y abscissa of a true error ellipse. Alternate Source - Not measureable. Set to values above 9990 to indicate mathematically qualitative uncertainty.

Process_Date: Unknown

Process_Step:

Process_Description:

GCDB lists all coordinates produced with connectivity codes between points.

Process_Date: Unknown

Process_Step:

Process_Description:

Section subdivision is performed to achieve land unit detail to at least the forty acre parcel level if required.

Process_Date: Unknown

Process_Step:

Process_Description:

GCDB data conversion software verifies correctness of GCDB file formats and content.

Process_Date: 20010712

Process_Step:

Process_Description:

Lines file with connectivity codes, from data conversion output, read by the topology check application. All errors in topology are flagged for editing and correction. This process creates successful GIS coverages if no topological errors are encountered.

Process_Date: 20010712

Process_Step:

Process_Description:

If topological errors exist editing of arc, node and attribute data is performed using GIS software. Final edits are captured in the input files and processes are repeated until all errors are corrected and successful GIS coverage is created.

Process_Date: Unknown

Process_Step:

Process_Description:

The township boundary may have been automatically adjusted to resolve positional discrepancies less than 0.1 meter with adjoining townships.

Process_Date: Unknown

Process_Step:

Process_Description:

Successful GIS coverages with verified coordinates, lines, and labels are converted to ArcInfo interchange (.e00) and ArcInfo shapefiles and copied to the public web site for download.

Process_Date: Unknown

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000001

Longitude_Resolution: 0.000000001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_Clarke_1866

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: project_aat

Entity_Type_Definition: Arc Attribute Table

Entity_Type_Definition_Source: Arcinfo

Attribute:

Attribute_Label: Data

Attribute_Definition:

Attributes contained within the arc attribute table describe the beginning and ending points of an arc, the polygons related to the left and right of a given arc, it's length, and a determination of whether a given arc is a dangle.

Attribute_Definition_Source: BLM

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value:

FNODE# = Starting point for adjusted bearing TNODE# = Ending point for adjusted bearing LPOLY# = Unique number assigned to left polygon RPOLY# = Unique number assigned to right polygon LENGTH = Internal ArcInfo Calculation PROJECT# = Internal ArcInfo ordering PROJECT-ID = Internal ArcInfo ordering TYPE = Internal ArcInfo ordering SYMBOL = Internal to ArcInfo ORIG_ARC = Internal to ArcInfo DANGLE_FLAG = Flag denoting arc is a dangle

Enumerated_Domain_Value_Definition:

Attributes contained within the arc attribute table describe the beginning and ending points of an arc, the polygons related to the left and right of a given arc, it's length, and a determination of whether a given arc is a dangle.

Enumerated_Domain_Value_Definition_Source: BLM

Detailed_Description:

Entity_Type:

Entity_Type_Label: project_pat

Entity_Type_Definition: Polygon Attribute Table

Entity_Type_Definition_Source: ArcInfo

Attribute:

Attribute_Label: Data

Attribute_Definition:

Attributes contained within the polygon attribute table describe the labels assigned to each parcel that define their respective PLSS legal land description.

Attribute_Definition_Source: BLM

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value:

Area = Internal ArcInfo calculation PERIMETER = Internal ArcInfo calculation PROJECT# = Internal ArcInfo ordering PROJECT-ID = Internal ArcInfo ordering SEC_NO = Number of Section with value between 0 and 36 SEC_FRAC = Section fractional code: 1=1/4, 2=1/2, 3=3/4 SEC_DUP = Flag determining duplicate section number NOMINAL_LOCATION = Alpha code for quarter-quarter section: A through Q, and Z QUARTER = Alpha code for quarter section: NE, SE ,SW ,NW SURVEY_TYPE = Alpha code determining classification of particular survey: A through Z, excluding C,F,S SURVEY_NUMBER = Alpha-numeric value generally taken from survey plat SURVEY_SUFFIX = Unique alpha-numeric code that further defines survey number SURVEY_NOTE = Unique alpha-numeric code for describing attributes of survey type ACREAGE = Acreage value as described on source documents of survey CONFLICT_CD = Alpha code identifying conflicts between surveys PRINMER_CD = Numeric code for identifying principal meridian TIER_NO = Numeric code identifying township number TIER_FRAC = Numeric code identifying fractional township, 1, 2, 3, 4 TIER_DIR_CODE = Alpha code for identifying direction of township, N, S RANGE_NO = Numeric code identifying range number RANGE_FRAC = Numeric code identifying fractional township, 0=no fraction,1=1/4, 2=1/2, 3=3/4 RANGE_DIR_CD = Alpha code for identifying direction of township, E, W TOWNSHIP_DUP_CD = Alpha code for determining a duplicate township: Blank, A or B LATITUDE = Geographic coordinate for latitude of label point LONGITUDE = Geographic coordinate for longitude of label point

Enumerated_Domain_Value_Definition:

Attributes contained within the polygon attribute table describe the legal land description of all parcels contained within a given project.

Enumerated_Domain_Value_Definition_Source: BLM

Detailed_Description:

Entity_Type:

Entity_Type_Label: project_nat

Entity_Type_Definition: Node Attribute Table

Entity_Type_Definition_Source: ArcInfo

Attribute:

Attribute_Label: Data

Attribute_Definition:

Attributes contained within the node attribute table describe the elevation, error in easting and northing, point identifier, coordinate values, and point connectivity codes.

Attribute_Definition_Source: BLM

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value:

ARC# = Internal ArcInfo calculation PROJECT# = Internal ArcInfo ordering PROJECT-ID = Internal ArcInfo ordering ELEV = Elevation of project in feet ERROR_N = Value in feet of the Y axis abscissa of a true error ellipse for GMM, the average misclosure of geodetic traverses between known coordinates for PCCS, or a value in excess of 9990 indicating statistical uncertainty for Alternate Source data. ERROR_E = Value in feet of the X axis abscissa of a true error ellipse for GMM, the maximum misclosure of geodetic traverses between known coordinates for PCCS, or a value in excess of 9990 indicating statistical uncertainty for Alternate Source data. LINE_CNT = Incremental counter of lines in drawing file LINE_TYPE = Numeric code for defining specific line types LINE_PEN = Numeric code for determining how pen draws, 1=skip,2=pen down, 3=continue drawing, 4=pen up LX_SEC = Numeric code defining position of points within lines file delineated by 999999 POINT_ID = A five to six digit township unique numeric code for each point X-UTM-ST = X coordinate for Universal Transverse Mercator or State Plane derived from longitude of GCDB point. Y-UTM-ST = Y coordinate for Universal Transverse Mercator or State Plane derived from latitude of GCDB point X-COORD = X coordinate for longitude of GCDB point Y-COORD = Y coordinate for latitude of GCDB point SYM_VALUE = Symbol value internal to ArcInfo

Enumerated_Domain_Value_Definition:

Attributes contained within the node attribute table describe the elevation, error in easting and northing, township specific point identifier, coordinate values, and point connectivity codes.

Enumerated_Domain_Value_Definition_Source: BLM

Overview_Description:

Entity_and_Attribute_Overview:

The labels assigned to parcels within the GCDB are derived from the BLM's Legal Land Description (LLD) data base. Labels designate the legal description of all parcels contained within the PLSS.

Entity_and_Attribute_Detail_Citation:

U.S. Department of the Interior, U.S. Bureau of Land Management, 2000 LR2000 data base.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Milbert Krohn

Contact_Organization: Branch of Cadastral Surveys

Contact_Address:

Address_Type: mailing address

Address: 5353 Yellowstone Ave., P.O. Box 1828

City: Cheyenne

State_or_Province: Wyoming

Postal_Code: 82009-1828

Contact_Voice_Telephone: 307-775-6225

Contact_Electronic_Mail_Address: Milbert_Krohn@blm.gov

Distribution_Liability:

Although these data have been processed successfully on a computer system at the U.S. Bureau of Land Management no warranty expressed or implied is made by the BLM regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The distributor shall not be held liable for improper or incorrect use of this data, based on the data quality section of this document. It is strongly recommended that this data is directly acquired from the distributor described above or through the online option listed below, and not indirectly through other sources which may have changed the data in some way.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE (Arc/Info export), Arc/Info shapefile

Fees: No fees are required for downloading the data that is on-line.

Metadata_Reference_Information:

Metadata_Date: 20030922

Metadata_Contact:

Contact_Information:

Contact_Address:

Address_Type: mailing address

Address: 5353 Yellowstone Ave., P.O. Box 1828

City: Cheyenne

State_or_Province: Wyoming

Postal_Code: 82009-1828

Contact_Voice_Telephone: 307-775-6225

Contact_Electronic_Mail_Address: Milbert_Krohn@blm.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998