Metadata: Identification_Information: Citation: Citation_Information: Originator: Paul Russel Originator: Colin Lyons Originator: Li H. Erikson Originator: Ann E. Gibbs Publication_Date: 20250708 Title: First finished floor elevation data collected in seven Alaska communities, state plane coordinate system Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13YIWKC Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P13YIWKC Larger_Work_Citation: Citation_Information: Originator: Li H. Erikson Originator: Ann E. Gibbs Originator: Richard M. Buzard Originator: Daniel J. Nowacki Originator: Alexander G. Snyder Originator: Anita C. Engelstad Originator: Cordell Johnson Originator: Alexander L. Nereson Originator: Jin-Si R. Over Originator: Paul Russel Originator: Colin Lyons Publication_Date: 2025 Title: In situ field data, Coastal Alaska, 2023 to 2025 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13YIWKC Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Erikson L.H., Gibbs A.E., Buzard R.M., Nowacki D.J., Snyder A.G., Engelstad A.C., Johnson C., Nereson A.L., Over J.R., Russel, P., Lyons, C., 2025, In situ field data, Coastal Alaska, 2023 to 2025: U.S. Geological Survey data release, https://doi.org/10.5066/P13YIWKC Online_Linkage: https://doi.org/10.5066/P13YIWKC Description: Abstract: First finished floor elevation data, as well as ground survey points for critical infrastructure, for example bridges, fuel farms, and power generators, were collected in Elim, Golovin, Kotzebue, Mekoryuk, Saint George, Stebbins, and Tununak, Alaska. The elevation data were collected with real-time kinematic global navigation satellite system (RTK-GNSS) equipment. Data are available in CSV file format. Two files are available per community: one in the Alaska State Plane coordinate system (this dataset) and the other in a geographic coordinate system (in this same data release). Additionally, the supplemental survey reports are provided. Purpose: This product was created to help advance coastal storm response and recovery in Alaskan coastal communities in the wake of the September 2022 extratropical Typhoon Merbok disaster. It is being used by the USGS to establish a baseline of current conditions and integrate them with forecasted coastal flood extents to inform proactive planning, strengthen community resilience, and support the development of targeted policies that mitigate the impacts of future storm events. This product is intended for reuse by scientists, managers, and the general public. Supplemental_Information: Work was funded by Title VII of Division N in the Consolidated Appropriations Act, 2023 (Public Law 117–328) to support direct recovery and rebuilding decisions in the wake of declared disasters related to hurricanes and typhoons in 2022. For more information on these efforts, see https://www.usgs.gov/supplemental-appropriations-for-disaster-recovery-activities/typhoon-merbok-coastal-community. To comply with statue requirements (AS 34.65.020. Entry Upon Land for Survey Purposes), notice was given to each community on the timing of the surveys and nature of the work being conducted. Data is referenced to North American Datum of 1983 with National Adjustment of 2011 (NAD83 [2011]). Eastings and northings are relative to the local Alaska State Plane zone. Elevations reference the North American Vertical Datum of 1988 using corrections from GEOID12B for Alaska (NAVD 88 [GEOID12B]). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180710 Ending_Date: 20250129 Currentness_Reference: Ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -169.67477 East_Bounding_Coordinate: -162.24351 North_Bounding_Coordinate: 66.90424 South_Bounding_Coordinate: 56.56750 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:8d5f1114-cdfd-4e40-b8e2-77e8b59d9e99 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: beach Theme_Keyword: shore Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Bathymetry and Elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: coastal processes Theme_Keyword: topography Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme_Keyword: Typhoon Merbok Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of Alaska Place_Keyword: Elim Place_Keyword: Golovin Place_Keyword: Kotzebue Place_Keyword: Mekoryuk Place_Keyword: Saint George Place_Keyword: Stebbins Place_Keyword: Tununak Access_Constraints: No access constraints Use_Constraints: USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: FFE_DataCollection_locations.png Browse_Graphic_File_Description: Satellite image showing the locations where elevation data were collected. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Trimble Business Center, National Geodetic Survey Online Positioning User Service (https://geodesy.noaa.gov/OPUS/) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal accuracy assessment was performed. Logical_Consistency_Report: All data fall within expected ranges. Completeness_Report: Dataset is considered complete for the information presented, as described in the abstract. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The estimated horizontal accuracy of these points ranges from 0.011 meters to 0.094 meters. These values are derived by summing the manufacturer reported vertical uncertainty (0.008 meters) and the horizontal accuracy of the NGS OPUS-derived position of the GNSS base station operating on temporary benchmark at the 95 percent confidence level in quadrature. The mean estimated horizontal accuracy for all points is 0.036 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The estimated vertical accuracy of these points ranges from 0.353 meters to 0.364 meters. These values are derived by summing the manufacturer report vertical uncertainty (0.015 meters) and, where available, the vertical precision for each point (calculated at the 95 percent confidence level by the post-processing software, and reported as the Network accuracy at the 95 percent confidence level), and the vertical accuracy of the NGS OPUS-derived position of the GNSS base station operating on temporary at the 95 percent confidence level (0.352-0.360 meters, of which the geoid error (GEOID12B) accounts for 0.352 meters) in quadrature. The mean estimated vertical accuracy for all points is 0.356 meters. Lineage: Process_Step: Process_Description: Survey teams from or contracted by the Alaska Native Tribal Health Consortium traveled to seven communities and surveyed first finished floor elevations (FFEs) of all critical buildings and base elevations for critical infrastructure that are within anticipated coastal erosion and flood zones. Surveyed infrastructure FFEs include the airport runway corners and center, schools, clinics, fuel tank farms, offices, washeterias, public buildings, homes, landfills, sewage lagoons, water treatment plants, power plants, cemeteries, fish processing plants, bridges, barge landings, public safety buildings, and other structures identified as critical by local government. To comply with statue requirements (AS 34.65.020. Entry Upon Land for Survey Purposes), notice was given to each community on the timing of the surveys and nature of the work being conducted. Surveys were conducted under the supervision of a licensed land surveyor using Trimble survey grade receivers. Elevation data were collected using a real-time-kinematic global navigation satellite system (RTK-GNSS) positioning technique. Surveys were tied into existing control benchmarks, where available, as documented by the National Geodetic Survey (NGS) and the National Oceanographic and Atmospheric Administration (NOAA). The base station data were post-processed using the NGS online positioning user service (OPUS) tool. All data were post-processed and quality checked using Trimble Business Center software. Additional information is available in the supplementary survey reports provided (see FFE_supplemental_SurveyReports.zip). Process_Date: 20250211 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 4520 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System 1983 State_Plane_Coordinate_System: SPCS_Zone_Identifier: 5007 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9999 Longitude_of_Central_Meridian: -162 Latitude_of_Projection_Origin: 54 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.001 Ordinate_Resolution: 0.001 Planar_Distance_Units: Survey feet Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System 1983 State_Plane_Coordinate_System: SPCS_Zone_Identifier: 5008 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9999 Longitude_of_Central_Meridian: -166 Latitude_of_Projection_Origin: 54 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.001 Ordinate_Resolution: 0.001 Planar_Distance_Units: Survey feet Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System 1983 State_Plane_Coordinate_System: SPCS_Zone_Identifier: 5009 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9999 Longitude_of_Central_Meridian: -170 Latitude_of_Projection_Origin: 54 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.001 Ordinate_Resolution: 0.001 Planar_Distance_Units: Survey feet Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.01 Altitude_Distance_Units: Meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: FFE_7AlaskaCommunities_AKStatePlaneCoordinates.zip Entity_Type_Definition: Zip file contains first floor and ground survey measurements for seven communities (defined by CommunityName in file name) in a file with Alaska State Plane coordinates (“AKSPZ*”, where * is the zone, ranging from 7-9) Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: ID Attribute_Definition: Identifying point number Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Unrepresentable_Domain: Unique numbers identifying location points within each community. IDs are not unique across communities. Attribute: Attribute_Label: Northing_ft Attribute_Definition: Northing coordinate (Alaska State Plane Coordinate) Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 937848.370 Range_Domain_Maximum: 4716961.160 Attribute_Units_of_Measure: U.S. survey foot Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: Easting_ft Attribute_Definition: Easting coordinate (Alaska State Plane Coordinate) Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1476011.960 Range_Domain_Maximum: 1776568.570 Attribute_Units_of_Measure: U.S. survey foot Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: AKSP_zone Attribute_Definition: Alaska State Plane zone Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 7 Range_Domain_Maximum: 9 Attribute_Units_of_Measure: State plane coordinate system zone Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Elev_ft Attribute_Definition: Elevation relative to NAVD88 (GEOID12B) Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 7.14 Range_Domain_Maximum: 192.97 Attribute_Units_of_Measure: feet Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Elev_m Attribute_Definition: Elevation relative to NAVD88 (GEOID12B) Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2.18 Range_Domain_Maximum: 58.82 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Description Attribute_Definition: Description of point Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Unrepresentable_Domain: Descriptive text. FF stands for first floor and GS for ground survey. Overview_Description: Entity_and_Attribute_Overview: The first line of the csv file is a header line. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in csv format Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: comma-delimited text Format_Version_Date: 2025 Format_Information_Content: zip file (FFE_7AlaskaCommunities_AKStatePlaneCoordinates.zip) contains seven CSVs with location and elevation data File_Decompression_Technique: WinZip Transfer_Size: 0.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P13YIWKC Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link then scrolling down to the Location-Elevation Data section. Digital_Form: Digital_Transfer_Information: Format_Name: Portable Document Format Format_Version_Date: 2025 Format_Information_Content: zip file (FFE_supplemental_SurveyReports.zip) contains survey reports in Portable Document Format (PDF) File_Decompression_Technique: WinZip Transfer_Size: 1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P13YIWKC Access_Instructions: The supplemental survey reports can be downloaded using the Network_Resource_Name link then scrolling down to the Supplemental Files section of this data release the FFE dataset. Fees: None. Technical_Prerequisites: The CSV data can be viewed with any text reading software. The PDF files can be viewed with Acrobat Reader or similar software. Metadata_Reference_Information: Metadata_Date: 20250708 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Person: PCMSC Science Data Coordinator Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998