Identification_Information: Citation: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment H: Chevak to Newtok Geospatial_Data_Presentation_Form: digital surface model Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8H Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p. Online_Linkage: http://doi.org/10.14509/30086 Description: Abstract: Aerial photographs of the coastline from Chevak to Newtok were collected on May 6, 2016. The photographs were processed using Structure-from-Motion (SfM) photogrammetric techniques. Global Positioning System (GPS) checkpoints were collected via a Global Navigation Satellite System (GNSS) survey conducted between August 15 and September 14, 2015. For the purposes of open access to elevation and orthoimagery datasets in coastal regions of Alaska, this collection is being released as a Raw Data File with an open end-user license. This file is a single-band, 32-bit float DSM (digital surface model) which represents surface elevations of buildings, vegetation, and uncovered ground surfaces in meters with 20 cm GSD. The No Data value is set to -32767. The file employs LZW compression. Purpose: The State of Alaska Division of Geological & Geophysical Surveys contracted with Fairbanks Fodar to acquire photogrammetric digital surface models (DSMs) and co-registered orthorectified aerial images (orthoimages) for the west coast of Alaska in support of coastal vulnerability mapping. Users can access the data, as well as additional metadata, from the DGGS website: http://doi.org/10.14509/30086. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2016 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -165.943334 East_Bounding_Coordinate: -164.336465 North_Bounding_Coordinate: 61.515682 South_Bounding_Coordinate: 60.799003 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Coastal Theme_Keyword: Coastal and River Theme_Keyword: Engineering Theme_Keyword: Engineering Geology Theme_Keyword: Environmental Theme_Keyword: Geologic Hazards Theme_Keyword: Geology Theme_Keyword: Geomorphology Theme_Keyword: Hazards Theme_Keyword: Marine Geology Theme_Keyword: Methods Theme_Keyword: Raster Image Theme_Keyword: Surficial Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Chevak Place_Keyword: Newtok Access_Constraints: This report, map, and/or dataset is 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. The 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. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager 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_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 Data_Set_Credit: This publication is funded with qualified outer continental shelf oil and gas revenues by the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service, U.S. Department of the Interior. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government. Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2016 Title: Photogrammetric digital surface models and orthoimagery for 26 coastal communities of western Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/29548 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2017 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 21 p Online_Linkage: http://doi.org/10.14509/29744 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2017 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment A: Wales to Teller Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8A Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://doi.org/10.14509/29771 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2017 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment B: Teller to Nome Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: http://doi.org/10.14509/29745 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2017 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment C: Nome to Elim Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8C Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/29772 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment D: Elim to Stebbins Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8D Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30082 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment E: Stebbins to Kotlik Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8E Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30083 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment F: Kotlik to Nunam Iqua Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8F Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30084 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment G: Nunam Iqua to Chevak Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8G Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30085 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment I: Newtok to Nightmute Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8I Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30087 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment J: Newtok to Toksook Bay Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8J Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30088 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment K: Nightmute to Kipnuk Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8K Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30089 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment L: Kipnuk to Kongiganak Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8L Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30090 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment M: Kongiganak to Bethel Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8M Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30091 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment N: Bethel to Eek Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8N Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30092 Cross_Reference: Citation_Information: Originator: Overbeck, J.R. Originator: Hendricks, M.D. Originator: Kinsman, N.E.M. Publication_Date: 2018 Title: Photogrammetric digital surface models and orthoimagery for the continuous coastline, Wales to Platinum, Alaska, segment O: Eek to Goodnews Bay Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-8O Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: http://doi.org/10.14509/30093 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data are in their raw format; for community-level data where vertical controls have been rigorously applied, are higher resolution, and have fewer gaps, see Overbeck and others (2016; http://doi.org/10.14509/29548). General data collection, processing, and accuracy assessment procedures in this release are described in a data release overview (Overbeck and others, 2017; http://doi.org/10.14509/29744). Horizontal and vertical accuracies of the orthoimagery and DSMs are evaluated using photo-identifiable checkpoints and elevation checkpoints collected by RECON, LLC (Overbeck and others, 2016). Accuracy assessment values reported for each alongshore segment are the mean residual between non-vegetated ground control and checkpoints and the DSM. Known, uncorrected anomalies over water bodies and cloud or snow covered areas exist throughout the project area. See accompanying report for comprehensive metadata, including discussion of the number of ground control checkpoints, accuracy statistics, and known anomalies. Logical_Consistency_Report: Data quality have been assessed relative to checkpoints collected simultaneously with the aerial survey described in the community scale data release (Overbeck and others, 2016). Since no ground control points were used to control these data, all points are considered checkpoints. Although checkpoints are focused at community locations and at large alongshore intervals, they have been used to assess the accuracy of these data at a regional scale. Photo-identifiable points were used to determine the horizontal accuracy of these data, while all points were used to determine the vertical accuracy unless the ground cover was irregular and non-vegetated (e.g. boulder piles). Data within this alongshore segment may overlap with data in an adjacent segment, and data segments may not overlap seamlessly. Completeness_Report: This data release provides continuous coastline data are in their raw format. Known issues are addressed in the accompanying reports. It is a supplement to Overbeck and others 2016; http://dggs.alaska.gov/pubs/id/29548, which provides high resolution for each coastal community. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Positional (horizontal) accuracy has been determined by identifying ground control points visually and comparing their location to the GPS-collected ground control, quantified as the horizontal radial root mean square error (RMSE; ASPRS, 2015). The positional accuracy at 95% confidence level was also computed according to ASPRS (2015). Horizontal accuracy statistics are available in table format in the accompanying report. Since no ground control points were used to vertically or horizontally control these data, all ground control and checkpoints points are considered checkpoints for this accuracy assessment. Data quality have been assessed relative to checkpoints collected simultaneously with the aerial survey described in the community scale data release (Overbeck and others, 2016). Although these checkpoints are focused at community locations and at large alongshore intervals, they have been used to assess the accuracy of these data at a regional scale. Photo-identifiable points were used to determine the horizontal accuracy of these data (table 1), while all points were used to determine the vertical accuracy unless the ground cover was irregular and non-vegetated (e.g. boulder piles) (table 2). Data within this alongshore segment may overlap with data in an adjacent segment, and data segments may not overlap seamlessly. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Elevation data have not been vertically shifted to best fit checkpoint elevations. Instead, GPS points have been used to assess the data quality only. The approach will allow the user to make informed decisions about how to vertically adjust the DSMs to best align with local vertical datums and/or meet project accuracy requirements. Vertical accuracy was determined at the 95% confidence level according to ASPRS (2015), using checkpoints for non-vegetated and vegetated locations separately. Vertical accuracy values relative to the reported altitude datum are available in table format in the accompanying report. The accompanying report provides a table of vertical accuracy values relative to the reported altitude datum. Lineage: Process_Step: Process_Description: Data acquisition - Fairbanks Fodar collected aerial photographs between Array, using a small aircraft (Cessna 170B) platform. The aerial survey was planned so flight lines and photograph frequency provided 60 percent side lap and 80 percent end lap photo coverage along with flying heights between 800 and 2,700 feet (244-823 m), resulting in 20 cm ground sample distance (GSD) of the aerial photos. A Nikon D800E with a 24 mm Nikkor f/1.4 lens was used to collect 36 megapixel photographs (7,360 x 4,912 pixels per image), in Joint Photographic Experts Group (JPEG) or Nikon Electronic Format (NEF), depending on location. Photos were collected at 1- to 3-second intervals. On-board global positioning system (GPS) data were acquired by a Trimble 5700 with roof-mounted antenna approximately 1 m above the camera, collecting at 5 Hertz. Each camera shutter trip placed an event marker onto the GPS datastream for precise timing and location. Process_Date: 2016 Process_Step: Process_Description: Data processing - Aerial survey GNSS data were processed using Waypoint's Grafnav commercial GNSS software using GPS constellation. Each project was processed using either post-processing kinematic (PPK) or precise point positioning (PPP) methods, depending on the quality of the solution, which was primarily dependent on the distance from Continually Operating Reference Stations (CORS), such that all flights resulted in data with better than 10 cm separation in forward and reverse trajectory solutions. GPS data were processed to the North American Datum 1983 (NAD83; 2011) European Petroleum Survey Group Well Known Identification Number (EPSG) 6318, and the North American Vertical Datum of 1988 (NAVD88; Geoid12A; EPOCH 2010.00). Photos were individually processed for optimum contrast and exposure using Adobe Camera Raw. To accommodate the large data acquisition volumes, most photos were shot and processed to JPEG format. Aerial survey GPS data (event marker coordinates) were manually correlated to image filenames using the image timestamp to create a camera external orientation file for import into Agisoft Photoscan Professional (Photoscan) software. The external orientation file provides the X, Y, Z position of the camera for each photograph taken during the survey. Process_Date: 2016 Process_Step: Process_Description: Photogrammetry - Aerial stereophotographs were imported into the photogrammetric software, which uses a SfM algorithm to create a three-dimensional terrain model from the stereo-imagery. The terrain model was then used to orthometrically correct the photos and produce the final orthoimage mosaic in Photoscan. Within the Photoscan software application, standard workflow steps were followed: photo-alignment, alignment optimization, dense point cloud building, mesh creation, DSM and orthoimage creation, and exporting the results. Process_Date: 2016 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 3 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -165 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101000025 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: NAVD88; Geoid12A; EPOCH 2010.00 Altitude_Resolution: 20 Altitude_Distance_Units: meters Altitude_Encoding_Method: Implicit coordinate Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Attribute_Layer_Name: digital surface model Entity_Type_Label: digital surface model Entity_Type_Definition: This file is a single-band, 32-bit float DSM (digital surface model) which represents surface elevations of buildings, vegetation, and uncovered ground surfaces in meters with 20 cm GSD. The No Data value is set to -32767. The file employs LZW compression. File format: GeoTIFF. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Fairbanks Fodar. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager 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_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 Resource_Description: RDF 2017-8H Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: digital surface model Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://doi.org/10.14509/30086 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20181219 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Person: Simone Montayne Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager 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_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 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 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 Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions