Identification_Information: Citation: Citation_Information: Originator: Wyoming Water Resources Center Publication_Date: 1994 Title: Wyoming Public Land Survey System Township/Range/Sections Publication_Information: Publication_Place: Laramie, Wyoming Publisher: University of Wyoming Spatial Data and Visualization Center Online_Linkage: Description: Abstract: This dataset represents a 1:100,000 scale Public Land Survey System layer for Wyoming. It was digitized from 57 different paper copies of BLM Surface Management Status series maps for Wyoming. (One map was from Idaho but covered a small section of Wyoming.) Purpose: This dataset was created for the purposes of identifying township/range section descriptions for areas in Wyoming within a spatial query/analysis context using GIS. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1974 Ending_Date: 1991 Currentness_Reference: Publication date of sources Status: Progress: complete Maintenance_and_Update_Frequency: There are no current plans for updating this data. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -111.04334504 East_Bounding_Coordinate: -103.83975861 North_Bounding_Coordinate: 44.99847416 South_Bounding_Coordinate: 40.95004564 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: township range section Theme_Keyword: Public Land Survey System Theme_Keyword: legal description Place: Place_Keyword_Thesaurus: none Place_Keyword: Wyoming Access_Constraints: none Use_Constraints: Data was created from 1:100,000 scale paper copy maps. It must be assumed that some "paper stretch" or distortion is included in the data and that the data is only as accurate as the paper maps it was produced from. The source maps were from various years and in various physical conditions. Some were newer maps in excellent shape, while others (Chugwater) were older (1974) and folded. In areas where surveys have not been done a code of 99 was used. All lot and tract descriptions were avoided. This data should never be used at a scale greater than 1:100,000 and not in situations other than regional or small-scale analysis is required. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Data Manager Contact_Organization: Spatial Data and Visualization Center Contact_Address: Address_Type: mailing address Address: Box 4008 University Station City: Laramie State_or_Province: Wyoming Country: USA Postal_Code: 82071 Contact_Voice_Telephone: 307-766-2735 Contact_Electronic_Mail_Address: n/a Hours_of_Service: 8 AM to 5 PM MST Browse_Graphic: Browse_graphic_file_name: plss.gif Browse_graphic_file_description: example of plss sections for northwest Wyoming Browse_graphic_file_type: gif Data_Set_Credit: U.S. Bureau of Land Management (source maps), Chris Arneson (digitization) Native_Data_Set_Environment: The data was created in and is stored in Arc/Info 7.0.4 software for Unix operating system. Arc/Info stores this data in a directory under the coverage name, wy_plss, and also in an associated INFO database directory. The Arc/Info coverage can be output in an export format (wy_plss.e00) which is 61.5 megabytes (MB) in size, compressed to 22.3 MB when zipped (wy_plss.e00.gz). When the export file is converted back to an Arc/Info coverage, all associated files total approximately 39.2 MB. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Each map once digitized was plotted on semi-translucent paper and overlayed with the original on a light-table. Any inconsistencies in linework or attributing was noted on the map and "checked off" as the needed changes were completed. (Lab standards similar to National Mapping Standards were strictly followed. For example, lab standards required that any linework deviating from the original map enough for "white space" to exist between the edit plot and the source map be documented and fixed. Step one was then performed again until no more errors were found.) Once all digitized maps were joined into one coverage several "dissolve" processes were performed to look for any inconsistencies in attributing. Dissolves were performed on both TOWNSHIP and RANGE. Searches were also made on the coverage for unattributed slivers and for polygons less than 10 acres that might have been errors. Quantitative_Attribute_Accuracy_Assessment: none Attribute_Accuracy_Value: unknown Attribute_Accuracy_Explanation: none Logical_Consistency_Report: All polygons are closed and adjacent polygons do not have identical attributes. Each polygon has one and only one attribute. Completeness_Report: The township/range section attributes are complete for all polygons in in Wyoming, except where there were no township/range/section designations on the source maps, in which case these polygons were labelled with a code of 99. All lot and tract descriptions were avoided. Lineage: Source_Information: Source_Citation: Citation_Information: Title: BLM Surface Management Status Maps for Wyoming Originator: Bureau of Land Management Publication_Date: 1974-1991 Source_Scale_Denominator: 100000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1974 Ending_Date: 1991 Source_Currentness_Reference: date of publication Source_Citation_Abbreviation: source maps Source_Contribution: source maps for digitization Source_Information: Source_Citation: Citation_Information: Title: Landownership for Wyoming Originator: Wyoming Gap Analysis Publication_Date: 1996 Source_Scale_Denominator: 100000 Type_of_Source_Media: digital map Source_Time_Period_of_Content: Time_Period_Information: Single_date/Time: Calendar_date: 1994 Source_Currentness_Reference: date of last update, 1994 Source_Citation_Abbreviation: landownership map Source_Contribution: source maps for digitization Process_Step: Process_Description: The source maps for this dataset were digitized using ARC/INFO Version 6.1.2 on a Sun Microsystems IPC workstation. Each map was first securely taped to the digitizer and registered to a master tic coverage created for the state using 15 tics per map. The master coverage contained 492 tics keyed into ARC/INFO with lat/long coordinates. This tic coverage was then projected to both UTM zone 12 and UTM zone 13 to cover both halves of Wyoming. When registering, an RMS error of 0.006 inches was set as our highest allowable error. Because of the quality of two of the source maps (Baggs and Chugwater), however, an RMS error of 0.007 inches had to be accepted for these two maps. The maps were then digitized in a "spaghetti" fashion and cleaned with the smallest fuzzy tolerance that ARC/INFO would allow. All dangle and sliver errors were then removed and the coverage was attributed. Each coverage was then reviewed (linework and attributes) and temporarily archived. When all 57 quads were digitized and reviewed the coverages were EDGEMATCHed to one another. Because the source maps were in two different projections only half of the state was edgematched and joined at a time. When these halves were finished, they were then joined to one another in a common projection. When one coverage was edgematched to another, a maximum adjustment distance was set to approximately one mile on the ground (or slightly more than one cm on the map). The coverages were then joined and adjoining lines removed. The coverage was then once again reviewed. To maintain consistency in boundaries throughout the WWRC GIS Lab's archive, the Wyoming state boundary for this set was taken from the landownership layer previously digitized by the Wyoming Gap Analysis Project in 1992. Because similar data automation techniques and review were used on both datasets the accuracy of the Wyoming state boundary should be viewed as the same accuracy as this dataset. Process_Date: 1993-1994 Source_Used_Citation_Abbreviation: source maps, landownership map Process_Step: Process_Description: Errors were discovered in some of the attributes of the first version of the PLSS coverage. Attributes for RANGE, R95N were changed to R95W; attributes R108 were changed to R108W to be consistent with other labelling conventions. It should also be noted that some TOWNSHIP attributes are labeled as T25.5 which is correct, not an error. The coverage with these attribute changes is refered to as Version or Edition 2. Process_Date: 199705 Source_Used_Citation_Abbreviation: none Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 97951 SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 204132 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 97952 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic Latitude_Resolution: .001 Longitude_Resolution: .001 Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: GRS1980 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: All meaningful attributes are included in the WY_PLSS.PAT file. Only polygon attributes were created for the layer. All coding was done within the fields TOWNSHIP, RANGE, and SECTION. TOWNSHIP and RANGE are character fields containing codes like "T21N" while SECTION is an integer field containing a number from 1 - 36 or 99 where no data was available. In some instances half-township codes were used (T21.5N) for small fractions of townships at junctions between two different surveys. WY_PLSS.MAP is a file associated with this dataset which lists all the names and publication dates of the source maps used in creating this digital spatial dataset. Entity_and_Attribute_Detail_Citation: none Detailed_Description: Entity_Type: Entity_Type_Label: WY_PLSS.PAT Entity_Type_Definition: Contains attributes for all polygons Entity_Type_Definition_Source: source maps Attribute: Attribute_Label: township Attribute_Definition: PLSS Township Code Attribute_Definition_Source: source maps Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: T12N (T3S, Wind River Indian Reservation) Range_Domain_Maximum: T58N (T9N, Wind River Indian Reservation) Attribute: Attribute_Label: range Attribute_Definition: PLSS Range Code Attribute_Definition_Source: source maps Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: R60W (R6E, Wind River Indian Reservation) Range_Domain_Maximum: R121W (R6W, Wind River Indian Reservation) Attribute: Attribute_Label: section Attribute_Definition: PLSS Section Attribute_Definition_Source: source maps Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 36 (99, no designation) Entity_Type: Entity_Type_Label: WY_PLSS.MAP Entity_Type_Definition: Contains names/dates of source maps Entity_Type_Definition_Source: source maps Attribute: Attribute_Label: map Attribute_Definition: name of source map Attribute_Definition_Source: source maps Attribute_Domain_Values: Codeset_Domain: Codeset_Name: USGS 1:100,000-scale quadrangle name Codeset_Source: USGS series Attribute: Attribute_Label: date Attribute_Definition: date of source map publication Attribute_Definition_Source: source maps Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1974 Range_Domain_Maximum: 1991 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Data Manager Contact_Organization: Spatial Data and Visualization Center Contact_Address: Address_Type: mailing address Address: Box 4008 University Station City: Laramie State_or_Province: Wyoming Country: USA Postal_Code: 82071 Contact_Voice_Telephone: 307-766-2735 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 description of appropriate/inappropriate used described in this metadata 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. This data was developed and is meant to be used at the 1:100,000-scale (or smaller scale) for the purpose of identifying township/range sections in Wyoming. The distributor makes no claims for the data's suitability for other purposes. 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: ftp.sdvc.uwyo.edu or http://www.sdvc.uwyo.edu/clearinghouse Access_Instructions: The data can be accessed online two different way: by anonymous ftp or by the world wide web. The anonymous ftp server is ftp.sdvc.uwyo.edu, and the data is stored in the /pub/gis directory. The WWW page is http://www.sdvc.uwyo.edu/clearinghouse. Instructions are provided on-line for downloading and importing the data. Online_Computer_and_Operating_System: Both the ftp and WWW server which this data is available from is a Silicon Graphics Challenge server, running the IRIX 6.2 UNIX operating system. Fees: No fees required for downloading the data that is on-line. Some fees may be required to cover costs of tapes if data is required on tape media. Metadata_Reference_Information: Metadata_Date: 19970529 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Margo Herdendorf Contact_Address: Address_Type: mailing address Address: Box 3067 University Station City: Laramie State_or_Province: Wyoming Postal_Code: 82071 Country: USA Contact_Voice_Telephone: 307-766-2735 Contact_Electronic_Mail_Address: meh@uwyo.edu Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608