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BUREAU OF LAND MANAGEMENT
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Public Land Survey for Wyoming, derived from BLM Geographic Coordinate Database

Metadata: 

Identification_Information:
Citation:
Citation_Information:
Originator: Bureau of Land Management, Wyoming
Publication_Date: 2002
Title:
Public Land Survey for Wyoming, derived from Bureau of Land Management Geographic Coordinate Database
Publication_Information:
Publication_Place: Cheyenne, WY
Publisher: Bureau of Land Management, Wyoming
Online_Linkage: Wyoming BLM GIS web page
Description:
Abstract:
This dataset contains township, range, section and some tract information for all surveyed portions of Wyoming. Most of the data originated from Bureau of Land Management (BLM) GCDB (Geographic Coordinate Data Base) files, generated from legal surveys. The townships that were not collected for the GCDB where created from MOSS (Map Overlay Statistical System) GIS maps. These township where forced to edgematch with surrounding and/or adjacent GCDB data.  
Purpose:
To provide base information about Wyoming's public survey system. May be used to locate legal descriptions to the section level.  
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -111
East_Bounding_Coordinate: -104
North_Bounding_Coordinate: 45
South_Bounding_Coordinate: 41
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Public Land Survey
Theme_Keyword: PLS
Theme_Keyword: Legal description
Theme_Keyword: Township
Theme_Keyword: Range
Theme_Keyword: Section
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Wyoming  
Access_Constraints: None.
Use_Constraints: None.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Larry Neasloney
Contact_Organization: Bureau of Land Management
Contact_Address:
Address_Type: mailing address
Address: 5353 Yellowstone Rd
City: Cheyenne
State_or_Province: Wyoming
Postal_Code: 82003
Country: USA
Contact_Voice_Telephone: 307-775-6171
Contact_Electronic_Mail_Address: n/a
Hours_of_Service: 8:00 - 5:00 MST
Data_Set_Credit: Zach Puls
Native_Data_Set_Environment:

The data was converted from Autocad DXF format and MOSS format to ARC/INFO vector line format on a Unix system.

 Data_Quality_Information:

Attribute_Accuracy:
Attribute_Accuracy_Report: Not available. Depends on the accuracy of the GCDB.
Logical_Consistency_Report:
Data has been checked for topological consistency. There are no dangling Arcs, unlabeled polygons, or other topological errors.  
Completeness_Report:
Portions of the Wyoming have never been surveyed and are not included in this dataset. Level 5 & 6 survey?  
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Generally, the user can assume the accuracy to be not less than 1:24000 or +- 50 ground feet. However,the following paragraph which is taken from the GCDB User's Guide on the Wyoming Geographic Information Advisory Council's GCDB Internet Page addresses limitations of GCDB data. These limitations also apply to the GIS/PLSS data layer.

Wyoming's GCDB data was generated using the most recent official BLM survey records and in some cases private survey records provided by the Forest Service. The quality of these surveys vary widely. Correspondingly, the accuracy of the coordinates generated varies widely. GCDB is designed to maintain the spatial relationships as depicted on our official (legal) records. Any errors in the data are distributed in an unpredictable manner. Given this, the user must be aware that any acreages which this data may allow to be calculated are legally invalid.  

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bureau of Land Management, Wyoming
Title: Geographic Coordinate Database (GCDB)
Publication_Date: Publication_Information Publication_Place
Source_Scale_Denominator: 24000
Type_of_Source_Media: digital
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1990
Ending_Date: 2002
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: GCDB
Source_Contribution: Main source of data 
Process_Step:
Process_Description:
This dataset is derived from the GDCB database. The following is an excerpt from the BLM's GCDB User's Manual (contact: Milbert Krohn, 307-775-6225). GCDB is generated from official BLM survey records and control coordinates of varying accuracy. GCDB data includes an estimate of the positional accuracy of the coordinates. This estimate is based on residual errors in adjusting survey data between known coordinates. This data allows the GIS user to determine suitability of the GCDB for various applications. GCDB data collection in Wyoming was initiated in September 1990. At that time, the Public Land Survey System Coordinate Computation Software (PCCS) was used for coordinate generation. In May of 1993, a second, and vastly improved, generation of GCDB software named Geographic Measurement Management (GMM) was released. GCDB is not a legal data base but rather attempts to maintain the spatial relationships as depicted on the legal survey records. The reliability of GCDB coordinates is dependent upon the quality of the data used to generate it which in many cases is poor. Given this, the user should be aware acreages which can be generated from GCDB data rarely reflect the legal acreages from the official survey records and are therefore invalid.  
Process_Date: Unknown
Process_Step:
Process_Description:
Most township coverages originated from GCDB(Geographic Coordinate Data Base)files. Some error corrections such as undershoots and overshoots were performed using Autocad. The corrected township dxf files were converted to ARC/INFO coverages using the DXFARC command. No original GCDB point coordinates where moved during this process. The townships that where not collected for the GCDB where created from MOSS(Map Overlay Statistical System)GIS maps. These township were forced to edgematch with surrounding and/or adjacent GCDB coverages. Townships where joined into 100K tiles. Slivers between townships were removed with the ELIMINATE command in ARC/INFO or cartographic license was taken to complete edgematching. Generally points where moved less than 10 ground feet.  

Process_Date: 1990-2002

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.01
Longitude_Resolution: 0.01
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257 
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Township datasets include these attributes:
dxf-text = Township and Range numbers combined (for quick queries) example: t35r117
township = Township numbers, example: t35n
range = Range Numbers, example: r117w
Meridian = Prime Meridian number, 6 or 111
Section datasets include these attributes:
dxf-text = section number (1 through 36)
Township = Township Numbers, example: t35n
Range = Range Numbers, example: r117w
Meridian = Prime Meridian number, 6 or 111
County: number 1 through 23
Entity_and_Attribute_Detail_Citation: none  
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Data Manager
Contact_Organization: Bureau of Land Management, Wyoming
Contact_Address:
Address_Type: mailing address
Address: 5353 Yellowstone
City: Cheyenne
State_or_Province: Wyoming
Country: USA
Postal_Code: 82001
Contact_Voice_Telephone: 307-775-6171
Contact_Electronic_Mail_Address: n/a
Distribution_Liability:
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 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)
Format_Version_Number: 7.0.4
Format_Version_Date: 1995
File_Decompression_Technique: Export file was created using defaults, no compression
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: not available yet
Access_Instructions: n/a
Online_Computer_and_Operating_System: NT

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

Metadata_Reference_Information:

Metadata_Date: 20021031
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Margo Berendsen
Contact_Address:
Address_Type: mailing address
Address: Box 4008 University Station
City: Laramie
State_or_Province: Wyoming
Postal_Code: 82071
Country: USA
Contact_Voice_Telephone: 307-766-2751
Contact_Electronic_Mail_Address: meh@uwyo.edu
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998 

Generated by mp version 2.4.13 on Thu Aug 3 17:03:09 2000