Identification_Information: Citation: Citation_Information: Originator: Beget, J.E. Originator: Larsen, J.F. Originator: Neal, C.A. Originator: Nye, C.J. Originator: Schaefer, J.R. Publication_Date: 2005 Title: Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2004-3 Publication_Information: Publication_Place: Fairbanks, AK Publisher: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:150,000 Online_Linkage: http://dx.doi.org/10.14509/7042 Description: Abstract: This dataset consists of the vector digital GIS files that were used to create sheet 1 of the "Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska" (DGGS RI 2004-3). The map area is centered around Okmok Volcano, on eastern Umnak Island. The data includes volcano-hazard zones for ballistics, ash accumulation, pyroclastic flows, floods and lahars, and debris avalanches. Also included in the dataset are roads, trails, seismic station locations, continuous GPS station locations, creeks, and the location of the Fort Glenn airstrip. Purpose: This dataset was created to illustrate, at a scale of 1:150,000 the approximate location of volcanic hazard zones around Okmok Volcano. Supplemental_Information: The basemap for the vector files included in this dataset is a georeferenced shaded relief tiff image whose metadata can be found in the file RI2004-3_basemap.faq.html. The 18 files listed below are available in both MapInfo TAB and ESRI shapefile format. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Listed here are the file names and a brief description of their content: >OKConeA5km_polyline approximate hazard zone for ballistics from Cone A >OKContinuousGPS_point location of continuous GPS stations >OKCraterCrFlood_polyline approximate limits of Crater Creek Flood hazard zone >OKCreeks_polyline major creeks around Okmok Volcano >OKDebrisArrows_polyline arrows showing the approximate location and direction of flow of debris avalanches that could occur on the steep flanks of Tulik Volcano and the inner caldera walls of Okmok Volcano >OKDebrisTDA_polyline mapped boundary of a prehistoric debris avalanche from Tulik Volcano >OKDebrisTulik_region approximate hazard zone for debris avalanches with source areas on the steep flanks of Tulik Volcano >OKFlood_region approximate location of flood and lahar hazards >OKFtGlennAir_point location of the Fort Glenn airstrip >OKHazMapBdry_polyline outline of the basemap >OKLatLines_polyline four 10-minute latitude lines in the map area >OKLongLines_polyline four 20-minute longitude lines in the map area >OKPFsurge_polyline approximate location of pyroclastic flow and surge hazard zone >OKRim15km_polyline approximate limit of significant ashfall, located 15 kilometers from the caldera rim >OKRim30km_polyline approximate maximum extent of pyroclastic flows, sures, and lateral blasts during a very large eruption, located 30 kilometers from the caldera rim >OKroad_polyline unmaintained dirt roads >OKSeisStat_point location of seismic stations >OKtrail_polyline unmaintained trails Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: as needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -168.7576 East_Bounding_Coordinate: -167.5153 North_Bounding_Coordinate: 53.7312 South_Bounding_Coordinate: 53.1099 Data_Set_G-Polygon: Data_Set_G-Polygon_Outer_G-Ring: G-Ring: -168.7262 53.7312, -167.5153 53.7020, -167.5634 53.1099, -168.7576 53.1384 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Aleutian Arc Theme_Keyword: Volcanoes Place: Place_Keyword_Thesaurus: none Place_Keyword: Aleutian Islands Place_Keyword: Fort Glenn Place_Keyword: Fox Islands Place_Keyword: Okmok, Mount Place_Keyword: Okmok Caldera Place_Keyword: Umnak Island Access_Constraints: This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Division of Geological & Geophysical Surveys Contact_Position: Alaska Volcano Observatory Geologist III Contact_Address: Address_Type: mailing and physical address Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907) 451-5010 Contact_TDD/TTY_Telephone: Not Available Contact_Facsimile_Telephone: (907) 451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm Monday through Friday, except State holidays Contact_Instructions: Please address all comments or questions to the e-mail address above whenever possible. Data_Set_Credit: This dataset was compiled by the authors with funds from the Alaska Volcano Observatory, a joint program of the U.S. Geological Survey, the University of Alaska Fairbanks-Geophysical Institute, and the Alaska Division of Geological & Geophysical Surveys. Native_Data_Set_Environment: This dataset was produced using MapInfo version 6.5 GIS software, then converted to ESRI shapefiles using MapInfo's universal translator. Data is available in both MapInfo TAB and ESRI shapefile formats. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attributes in this dataset consist of GPS and seismic station names and locations, latitude and longitude line labels, and creek names. The accuracy was checked by plotting the attributes as labels in a GIS, then checking the label against the source information. Seismic and GPS station locations and names were checked using the original source data. The latitude and longitude line labels were checked by displaying them in GIS and comparing the attribute value to the actual location. The creek labels were plotted then compared to the USGS 1:250,000-scale topographic map of Umnak Island. Creek names were also derived and visually checked from Byers, F.M., 1959, Geology of Umnak and Bogoslof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-L, p. 167-369. Logical_Consistency_Report: The latitude and longitude attributes of the seismic stations and GPS station files were reformatted so that the column labels were consistent and that both sets of data are reported in decimal degrees, WGS84 datum. Completeness_Report: This dataset includes preliminary information pertaining to the volcanic hazards at Okmok Volcano, Umnak Island, Alaska. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The accuracy of the estimated extent of any of the volcanic hazard zones should not be confused with the horizontal accuracy of the GIS data file. For example, the 5 kilometer circle drawn around cone A for ballistics hazards is positionally accurate to about 550 meters, based on the estimated "center" of cone A, however, ballistics could possibly travel much shorter or much longer distances, depending on the eruption magnitude (see text for details of each eruption hazard, DGGS RI2004-3). Most data layers were digitized on the shaded relief image OKhazbase.tiff, which has a horizontal accuracy of 60 meters (see metadata file RI2004-3_basemap_meta.txt) Each GIS layer is listed below with a brief description of its horizontal accuracy. OkmokConeA5km_polyline A 5 km circle was generated around the center point of Cone A. The center of cone A was approximated visually from the georeferenced shaded relief basemap image (OKhazbase.tiff). Accuracy is approximately 550 meters, which is the vent diameter. Cone A center (x,y)deg = (-168.2415, 53.3992); (x,y)meters = (683,393E, 5,920,230N). OKContinuousGPS_point Continuous GPS station locations are accurate to approximately 1 centimeter. OKCraterCrFlood_polyline This approximated hazard zone was sketched from the shaded relief image basemap and is based on field evidence of drainage patterns of lahars and floods down Crater Creek over the last approximately 2,000 years. OKCreeks_polyline Creeks were originally digitized from the USGS 1:250,000-scale georeferenced DRG topographic map of Umnak Island. The creeks were reprojected in MapInfo version 6.0 from the raster topo base of UTM NAD27 to UTM WGS84 to match the projection of the shaded relief basemap (OKhazbase.tiff). After reprojection the creeks were hand-edited in GIS and required adjustments up to 150 meters to fit the shaded relief basemap (OKhazbase.tiff). OKDebrisArrows_polyline Debris arrows are randomly placed on the steep flanks of Tulik Volcano and the inner caldera wall of Okmok Volcano. OKDebrisTDA_polyline This boundary is based on field geologic mapping at a scale of 1:63,360 and photo-interpretation resulting in a horizontal accuracy of about 500 meters. OKDebrisTulik_region This generalized boundary is based in part on the extent of the prehistoric debris avalanche at Tulik Volcano (file OKDebrisTDA). OKFlood_region Flood and lahar hazard zones were sketched from drainage patterns apparent on the Landsat7 GeoTIFF L72077023_023320000817_B80 of Umnak Island, acquired on 17 August 2000. The file was converted to red band 5, green band 4, and blue band 2 to enhance drainage patterns. Drainages with headwaters on the high flanks of the volcano are portrayed. OKFortGlennAir_point Location derived from USGS 1:250,000-scale Umnak Island quadrangle DRG topographic map. Accuracy approximately 150 meters. OKHazMapBdry_polyline Outline of OKhazbase.tiff, accurate to pixel size of OKhazbase.tiff (30 meters). OKLatLines_polyline Generated in GIS from decimal degree end points to an accuracy of 5 decimal points, or approximately 1 meter. OKLongLines_polyline Generated in GIS from decimal degree end points to an accuracy of 5 decimal points, or approximately 1 meter. OKPFsurge_polyline Centered 10 kilometers around cone A (cone A center accuracy about 550 meters) with an approximate 17 kilometer extension downslope out through the breach in the caldera. OKRim15km_polyline The approximate diameter of the somewhat circular caldera is 10 kilometers, therefore a 20-kilometer circle was generated in a GIS around the approximate center of the caldera. The center of the caldera was approximated visually in a GIS from the georeferenced shaded relief basemap (OKhazbase.tiff). Accuracy is approximately 1,500 meters. For this purpose, the caldera center was positioned at (x,y)deg = (-168.4372, 53.4348); (x,y)meters = (670,243E, 5,923,700N). OKRim30km_polyline The approximate diameter of the somewhat circular caldera is 10 kilometers, therefore a 35 kilometer circle was generated in a GIS around the approximate center of the caldera. The center of the caldera was approximated visually in a GIS from the georeferenced shaded relief basemap (OKhazbase.tiff). Accuracy is approximately 1,500 meters. For this purpose, the caldera center was positioned at (x,y)deg = (-168.4372, 53.4348); (x,y)meters = (670,243E, 5,923,700N) OKroad_polyline Roads were digitized from the USGS 1:250,000-scale Umnak Island quadrangle DRG topographic map, then reprojected from UTM NAD27 to UTM WGS84 in MapInfo version 7.0. Accuracy is approximately 150 meters. OKSeisStation_point Seismic stations were located with hand-held GPS units (accuracy less than 15 meters) except OKCD, OKFG, and OKCE, which were located with differentially corrected Trimble GPS units with an accuracy of less than 1 centimeter. OKtrail_polyline Trails were digitized from the USGS 1:250,000-scale Umnak Island quadrangle DRG topographic map, then reprojected from UTM NAD27 to UTM WGS84 in MapInfo version 7.0. Accuracy is approximately 150 meters. Lineage: Process_Step: Process_Description: Geologic field investigations were conducted by the authors to determine the eruptive history and the geographic extent of volcanic deposits at Okmok Volcano. Based on these field investigations and the knowledge of volcanic events at other volcanoes, the volcano hazard zones were determined for Okmok Volcano. Hazard zones were digitized in a GIS using the shaded relief image (OKhazbase.tiff) as a guide. Flood and lahar hazard zones were sketched from drainage patterns apparent on the Landsat7 GeoTIFF L72077023_023320000817_B80 of Umnak Island, acquired on 17 August 2000. The file was converted to red band 5, green band 4, and blue band 2 to enhance drainage patterns. Process_Date: 200409 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Division of Geological & Geophysical Surveys Contact_Person: Janet R. Schaefer Contact_Position: Alaska Volcano Observatory, Geologist III Contact_Address: Address_Type: mailing and physical address Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907) 451-5010 Contact_TDD/TTY_Telephone: Not available Contact_Facsimile_Telephone: (907) 451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm Monday through Friday, except State holidays Contact_Instructions: Please address all comments or questions to the e-mail address above whenever possible. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 2 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -171.0000 Latitude_of_Projection_Origin: 0.0000 False_Easting: 500000.0000 False_Northing: 0.0000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.01 Ordinate_Resolution: 0.01 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: WGS 1984 Ellipsoid_Name: WGS 1984 Semi-major_Axis: 6378137.0000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKConeA5km_polyline Entity_Type_Label: OKConeA5km_polyline.shp Entity_Type_Definition: One polyline object representing a 5-kilometer-diameter circle around cone A, centered on (x,y)deg = (-168.2415, 53.3992); (x,y)meters = (683,393E, 5,920,230N). Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKContinuousGPS_point Entity_Type_Label: OKContinuousGPS_point.shp Entity_Type_Definition: Three data points, each with station name, latitude, longitude, and elevation. Latitude and longitude have a WGS84 datum; elevation is in meters. Entity_Type_Definition_Source: Data provided by Jeff Freymueller, UAF Geophysical Institute, in September 2001, in cooperation with the Alaska Volcano Observatory. Attribute: Attribute_Label: station Attribute_Definition: Continuous GPS station name Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: List of station names Attribute: Attribute_Label: longwgs84 Attribute_Definition: longitude value of continuous GPS station location in decimal degrees using the WGS84 datum Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: longitude value Beginning_Date_of_Attribute_Values: 200109 Ending_Date_of_Attribute_Values: 200109 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 1 centimeter Attribute_Value_Accuracy_Explanation: GPS data was collected using a Trimble GPS unit and post-processed by differential correction data from a base station at Fort Glenn. Attribute: Attribute_Label: latwgs84 Attribute_Definition: latitude value of continuous GPS station location in decimal degrees using the WGS84 datum Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: latitude value Beginning_Date_of_Attribute_Values: 200109 Ending_Date_of_Attribute_Values: 200109 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 1 centimeter Attribute_Value_Accuracy_Explanation: GPS data was collected using a Trimble GPS unit and post-processed by differential correction data from a base station at Fort Glenn. Attribute: Attribute_Label: elev_meters Attribute_Definition: elevation in meters above mean sea level of continuous GPS station using the WGS84 datum Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: elevation value Beginning_Date_of_Attribute_Values: 200109 Ending_Date_of_Attribute_Values: 200109 Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 1 centimeter Attribute_Value_Accuracy_Explanation: GPS data was collected using a Trimble GPS unit and post-processed by differential correction data from a base station at Fort Glenn. Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKCraterCrFlood_polyline Entity_Type_Label: OKCraterCrFlood_polyline.shp Entity_Type_Definition: One polyline object representing the approximate limits of the Crater Creek flood hazard zone. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKCreeks_polyline Entity_Type_Label: OKCreeks_polyline.shp Entity_Type_Definition: 52 polyline objects representing major drainages around Okmok Volcano. Entity_Type_Definition_Source: USGS Umnak Island 1:250,000-scale topographic map Attribute: Attribute_Label: CreekName Attribute_Definition: Name of the creek as derived from USGS Umnak Island 1:250,000-scale topographic map and Byers, F.M., 1959, Geology of Umnak and Bogoslof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-L. Attribute_Definition_Source: Byers, F.M., 1959, Geology of Umnak and Bogoslof Islands, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-L; and USGS 1:250,000-scale topographic basemap series, Umnak Island quadrangle, Alaska. Attribute_Domain_Values: Unrepresentable_Domain: Not all line objects have creek names. Major creeks are named, others are unnamed. Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKDebrisArrows_polyline Entity_Type_Label: OKDebrisArrows_polyline.shp Entity_Type_Definition: 20 polyline objects. 20 randomly placed arrows indicating source regions for rockfalls and debris avalanches on the steep slopes of Tulik Volcano and the inner caldera walls of Okmok Volcano. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKDebrisTDA_polyline Entity_Type_Label: OKDebrisTDA_polyline.shp Entity_Type_Definition: One polyline object. Mapped boundary of a prehistoric debris avalanche from Tulik Volcano. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKDebrisTulik_region Entity_Type_Label: OKDebrisTulik_region.shp Entity_Type_Definition: One region object. Approximate hazard zone for debris avalanches with source areas on the steep flanks of Tulik Volcano. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKFlood_region Entity_Type_Label: OKFlood_region.shp Entity_Type_Definition: One region object. Approximate location of flood and lahar hazards. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKFtGlennAir_point Entity_Type_Label: OKFtGlennAir_point.shp Entity_Type_Definition: One point object. Approximate location of Fort Glenn airstrip. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKHazMapBdry_polyline Entity_Type_Label: OKHazMapBdry_polyline.shp Entity_Type_Definition: One polyline object. Outline of basemap OKhazbase.tiff. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKLatLines_polyline Entity_Type_Label: OKLatLines_polyline.shp Entity_Type_Definition: 4 line objects. 10-minute lines of latitude covering the map area. Entity_Type_Definition_Source: DGGS RI 2004-3 Attribute: Attribute_Label: LatDMSWGS84 Attribute_Definition: Latitude in degrees, minutes, seconds Attribute_Definition_Source: DGGS RI 2004-3 Attribute_Domain_Values: Unrepresentable_Domain: values of latitude Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKLongLines_polyline Entity_Type_Label: OKLongLines_polyline.shp Entity_Type_Definition: 4 line objects. 20-minute lines of latitude covering the map area. Entity_Type_Definition_Source: DGGS RI 2004-3 Attribute: Attribute_Label: LongDMSWGS84 Attribute_Definition: Longitude in degrees, minutes, seconds Attribute_Definition_Source: DGGS RI 2004-3 Attribute_Domain_Values: Unrepresentable_Domain: values of longitude Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKPFsurge_polyline Entity_Type_Label: OKPFsurge_polyline.shp Entity_Type_Definition: One polyline object. Approximate location of pyroclastic flow and surge hazard zone. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKRim15km_polyline Entity_Type_Label: OKRim15km_polyline.shp Entity_Type_Definition: One polyline object. Approximate limit of significant ashfall, located 15 kilometers from the caldera rim. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKRim30km_polyline Entity_Type_Label: OKRim30km_polyline.shp Entity_Type_Definition: One polyline object. Approximate maximum extent of pyroclastic flows, surges, and lateral blasts during a very large eruption, located 30 kilometers from the caldera rim. Entity_Type_Definition_Source: DGGS RI 2004-3 Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKroad_polyline Entity_Type_Label: OKroad_polyline.shp Entity_Type_Definition: Two polyline objects. Unmaintained dirt roads. Entity_Type_Definition_Source: Digitized from USGS Umnak Island 1:250,000-scale topographic map Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKSeisStat_point Entity_Type_Label: OKSeisStat_point.shp Entity_Type_Definition: 12 points. Latitude, longitude, and station name of 12 seismic stations around Okmok Volcano. Entity_Type_Definition_Source: Alaska Volcano Observatory Attribute: Attribute_Label: station Attribute_Definition: seismic station name Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: List of station names Attribute: Attribute_Label: longwgs84 Attribute_Definition: longitude value of seismic station location in decimal degrees using the WGS84 datum Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: longitude value Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 15 meters Attribute_Value_Accuracy_Explanation: For sites OKFG, OKCD, and OKCE, the GPS data was collected using a Trimble GPS unit and post-processed by differential correction data from a base station at Fort Glenn, resulting in an accuracy of less than 1 centimeter. All others were reported from a hand-held GPS unit with a NAD27 datum, then converted to the WGS84 datum using MapInfo 7.0 GIS. Attribute: Attribute_Label: latwgs84 Attribute_Definition: latitude value of seismic station location in decimal degrees using the WGS84 datum Attribute_Definition_Source: Alaska Volcano Observatory Attribute_Domain_Values: Unrepresentable_Domain: latitude value Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 15 meters Attribute_Value_Accuracy_Explanation: For sites OKFG, OKCD, and OKCE, the GPS data was collected using a Trimble GPS unit and post-processed by differential correction data from a base station at Fort Glenn, resulting in an accuracy of less than 1 centimeter. All others were reported from a hand-held GPS unit with a NAD27 datum, then converted to the WGS84 datum using MapInfo 7.0 GIS. Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: OKtrail_polyline Entity_Type_Label: OKtrail_polyline.shp Entity_Type_Definition: Two polyline objects. Unmaintained trails. Entity_Type_Definition_Source: Digitized from USGS Umnak Island 1:250,000-scale topographic map Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Position: Natural Resource Technician Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Contact_TDD/TTY_Telephone: None available. Contact_Facsimile_Telephone: 907-451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. 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Ordering_Instructions: Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (http://www.dggs.alaska.gov/) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround: Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid. Technical_Prerequisites: Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files. Metadata_Reference_Information: Metadata_Date: 20080506 Metadata_Review_Date: 20080506 Metadata_Future_Review_Date: 20091003 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Division of Geological & Geophysical Surveys Contact_Person: Janet R. Schaefer Contact_Position: Alaska Volcano Observatory Geologist III Contact_Address: Address_Type: mailing and physical address Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907) 451-5010 Contact_Facsimile_Telephone: (907) 451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays. Contact_Instructions: Please contact us through the e-mail address above whenever possible. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.