Public Land Survey for Wyoming, derived from BLM GCDB
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:
- NOTE: This PLSS data is in the process of being replaced. The preferred, most current PLSS data can be found at http://www.blm.gov/wy/st/en/resources/public_room/gis/datagis/themes/gcdbgis.html
- 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
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