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Wyoming Viewshed

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Bureau of Land Management
Publication_Date: 2/1/2002
Title: Wyoming Historic Trail Viewshed - UTM13 Datum Nad 83
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: Wyoming BLM GIS Webpage
Description:
Abstract:
This database for the Oregon, California, Mormon Pioneer, and Pony Express National Historic Trails is comprised of digital topographic data and reference line established using point data gathered with Global Positioning System (GPS) technology which represents only an approximation of the centerline of the trails system. This database, which is to be used in conjunction with ArcView software, is provided to assist the user in analyzing the visibility of any proposed location within 5 miles of the GPS reference line of the trails in order to evaluate effects to the landscape and setting of National Historic Trails in accordance with the National Historic Preservation Act and its implementing regulations at 36CFR Part 800. This data imparts no information relative to land ownership and conveys no right of access to any land. Legal access to or across private land requires permission of the landowner.
Purpose:
To assist in resource planning as it relates to the NHT setting.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2002
Currentness_Reference: publication date
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -108.00
East_Bounding_Coordinate: -104.00
North_Bounding_Coordinate: 43.00
South_Bounding_Coordinate: 41.00
Keywords:
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: viewshed
Theme:
Theme_Keyword_Thesaurus: viewshed
Theme_Keyword: viewshed
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Larry Neasloney (GIS questions) /Tim Nowak (cultural questions)
Contact_Organization: BLM
Contact_Position: GIS Specialist/ Archeologist
Contact_Voice_Telephone: 307-775-6171/307-775-6035
Contact_Electronic_Mail_Address: larry_neasloney@blm.gov/tim_nowak@blm.gov
Security_Information:
Security_Classification: Unclassified
Native_Data_Set_Environment:
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 5; ESRI ArcCatalog 8.1.1.649
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: See process step
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
viewsheds results from 30 meter dems and lines collected with GPS
Lineage:
Process_Step:
Process_Description:
1.gps line shapefiles are converted to coverages 2. grain tolerance set to 98 meters, weed tol set to 22 3. arcs splined in Arcedit to place a vertice approx. every 100 yards 4. field called 'Radius2' added to table to control viewshed distance to 5 miles. 5. field called 'Offseta' added to table to set observer height at 5 feet. 6. field called 'Offsetb' added to table to set object height at 12 feet. 7. viewshed analysis run using VISIBILITY command in Arc/Info with frequency option 8. field added to output coverage from step 7 called 'Vis-class' 9. in Arcview 'Vis-code' field queried for 'Vis-class' classes. 0 = Not Seen 1-5 = Seldom Seen 6-21 = Moderately Seen > 21 = Visible

10. Visibility coverage disssolved using 'Vis-class' field to make redisplay faster and more aesthetically pleasing.

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 42273
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 18612
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 18612
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 13
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -105.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000256
Ordinate_Resolution: 0.000256
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
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: cfo-viewshed2.pat
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: CFO-VIEWSHED2#
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: CFO-VIEWSHED2-ID
Attribute_Definition: User-defined feature number.
Attribute_Definition_Source: ESRI
Attribute:
Attribute_Label: VIS-CLASS
Attribute_Definition:
classes of visibilty 1. not seen 2. seldom seen(1 - 5 times) 3. moderately seen (6 - 21 times) 4. visible (> 21 times)
Beginning_Date_of_Attribute_Values: 10/2001
Ending_Date_of_Attribute_Values: ongoing
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: high
Attribute_Value_Accuracy_Explanation: produced from 30m dems and lines collected with gps
Distribution_Information:
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 10.812
Metadata_Reference_Information:
Metadata_Date: 20020108
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Bureau of Land Management
Contact_Person: Larry A. Neasloney
Contact_Address:
Address_Type: Mailing
PO Box 1828
City: Cheyenne
State_or_Province: Wyoming
Postal_Code: 82001
Contact_Voice_Telephone:
307.775.6171
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.7.3 on Tue Jan 08 14:29:45 2002