Combined high-resolution LIDAR topography and multibeam bathymetry for northern Resurrection Bay, Seward, Alaska

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Labay, Keith A.
Originator: Haeussler, Peter J.
Publication_Date: 2008
Title:
Combined high-resolution LIDAR topography and multibeam bathymetry for northern Resurrection Bay, Seward, Alaska
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: DS 374
Online_Linkage: <https://pubs.usgs.gov/ds/374>
Description:
Abstract:
We created a new Digital Elevation Model using the best available high-resolution topography and multibeam bathymetry surrounding the area of Seward, Alaska. Datasets of (1) LIDAR topography collected for the Kenai Watershed Forum, (2) Seward harbor soundings from the Army Corp of Engineers, (3) and NOAA multibeam bathymetry contributed to the final merged product. These datasets were placed into a common coordinate system, horizontal datum, vertical datum, and data format prior to being merged together. The projected coordinate system of Universal Transverse Mercator Zone 6 North American Datum of 1927 was used for the horizontal coordinates. Z-values in meters were referenced to the tidal datum of Mean High Water. Gaps between the datasets were interpolated to create the final seamless five-meter grid covering the area of interest around Seward, Alaska.
Purpose:
This digital elevation model (DEM) was created for studying submarine landslides and tsunamis produced by the M9.2 1964 earthquake at Seward, Alaska, and for developing computer models of tsunami inundation risks as part of the National Tsunami Hazards Mitigation Program.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2001
Ending_Date: 2007
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -149.465478
East_Bounding_Coordinate: -149.312773
North_Bounding_Coordinate: 60.156298
South_Bounding_Coordinate: 60.057664
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Bathymetry
Theme_Keyword: Elevation
Theme_Keyword: Topography
Theme_Keyword: LIDAR
Theme_Keyword: DEM
Place:
Place_Keyword_Thesaurus: Geographic names information system (GNIS)
Place_Keyword: Alaska
Place_Keyword: Kenai Peninsula
Place_Keyword: Resurrection Bay
Place_Keyword: Seward
Access_Constraints: None
Use_Constraints:
NOT TO BE USED FOR NAVIGATION Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from this data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Keith A. Labay
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4667
Country: U.S.A.
Contact_Voice_Telephone: 907-786-7410
Contact_Electronic_Mail_Address: klabay@usgs.gov
Native_Data_Set_Environment: Data set was created using ESRI ArcGIS 9.2
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: See Vertical Accuracy Report
Logical_Consistency_Report: The Z-values in this DEM are a composite of 3 major sources.
Completeness_Report:
This DEM has been visually inspected for completeness. NODATA areas exist.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: The horizontal accuracy of this DEM has not been tested.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: The vertical accuracy of this DEM has not been tested.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA National Ocean Service
Publication_Date: 2001
Title:
National Ocean Service Office of Coast Survey Hydrographic Survey Data
Geospatial_Data_Presentation_Form: ASCII YXZ data
Online_Linkage:
<http://www.ngdc.noaa.gov/nndc/struts/results?op_0=l&v_0=H11072&t=101523&s=3&d=5&d=10&d=11&d=12&d=13&d=14&d=15&d=16&d=17&d=18&d=19&no_data=suppress>
Source_Scale_Denominator: 10000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20010831
Ending_Date: 20010921
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: multibeam bathymetry
Source_Contribution: Bathymetry of northern Resurrection Bay.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kenai Watershed Forum
Publication_Date: unpublished
Title: none
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: DVD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20060106
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Seward LIDAR
Source_Contribution: LIDAR topography of Seward, Alaska.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Army Corps of Engineers
Publication_Date: unpublished
Title: none
Geospatial_Data_Presentation_Form: ASCII XYZ data
Type_of_Source_Media: text file
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20060428
Ending_Date: 20060504
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Seward harbor
Source_Contribution: Soundings of the Seward, Alaska harbor.
Process_Step:
Process_Description:
The Seward LIDAR data was obtained from the Kenai Watershed Forum as an ARC/INFO grid. Projection of the grid was Alaska State Plane FIPS 5004 NAD83. Z-values were in feet. The vertical datum of the Z-values was NAVD88. This grid was then reprojected into UTM Zone 6 NAD27. Z-values were converted to meters instead of feet. From the Seward tidal gages it was known that NAVD88 was 0.06 meters above Mean Lower Low Water. At Seward the difference between Mean Lower Low Water and Mean High Water is 2.96 meters, so the vertical datum was adjusted from NAVD88 to Mean High Water by adding a value of -2.9 meters. The grid was then resampled from the original 0.9144 meter cellsize to 5 meter cells. This resampled grid was then converted to a GIS point feature class.
The extent of the Seward LIDAR data included a portion of the ocean's surface near the shoreline. This allowed a polygon to be digitized that defined the shoreline at the time the LIDAR survey was collected. Using this polygon, data points that were returned from the ocean's surface were then eliminated.
Interpolation along the eastern and western boundaries of the grid was confined to those areas where data was collected to prevent interpolation across large areas of NODATA.
Source_Used_Citation_Abbreviation: Seward LIDAR
Process_Date: 200702
Source_Produced_Citation_Abbreviation: ocean mask
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Keith A. Labay
Contact_Address:
Address_Type: mailling and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Contact_Voice_Telephone: 907-786-7410
Process_Step:
Process_Description:
The Seward harbor data was obtained from the Army Corps of Engineers as an ASCII XYZ file. Projection of the data was Alaska State Plane FIPS 5004 NAD83. Depth values were in feet. The vertical datum of the depths was Mean Lower Low Water. A GIS point feature class was created from these points and reprojected into UTM Zone 6 NAD27. Depth values were converted to meters instead of feet and values greater than or equal to zero were deleted. The vertical datum of the depths was adjusted to Mean High Water by adding a value of -2.96 meters.
Using the remaining Seward harbor points, together with the Seward LIDAR data as a guide, a harbor mask was created to define the area where depth values would be determined from the Seward harbor points.
Source_Used_Citation_Abbreviation: Seward harbor
Process_Date: 200702
Source_Produced_Citation_Abbreviation: harbor mask
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Keith A. Labay
Contact_Address:
Address_Type: mailling and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Contact_Voice_Telephone: 907-786-7410
Process_Step:
Process_Description:
The multibeam bathymetry was downloaded from the internet as an ASCII YXZ file gridded to 15 meter cells. Projection of the coordinates was UTM Zone 6 NAD83 and the depths were in positive meters. The vertical datum of the depths was Mean Lower Low Water. A GIS point feature class was created from these coordinates and the depths were changed to negative values. These points were then reprojected into UTM Zone 6 NAD27. The vertical datum of the depths was adjusted to Mean High Water by adding a value of -2.96 meters.
Using the ocean mask defined from the Seward LIDAR data any points that fell outside of the polygon were eliminated. Points that overlapped with areas covered by the Seward harbor mask were also eliminated.
Source_Used_Citation_Abbreviation: multibeam bathymetry
Source_Used_Citation_Abbreviation: ocean mask
Source_Used_Citation_Abbreviation: harbor mask
Process_Date: 200702
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Keith A. Labay
Contact_Address:
Address_Type: mailling and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Contact_Voice_Telephone: 907-786-7410
Process_Step:
Process_Description:
The three modified point datasets were merged together to create a single dataset. This point dataset was used to interpolate the final merged DEM. Gaps between the three datasets in the intertidal zone were filled during the interpolation process to create a seamless transition. Along the steep sides of Resurrection Bay the separation between the LIDAR data and multibeam bathymetry was minimal, and required little to no interpolation. A shallow intertidal area at the head of the bay represented the only large gap within the DEM filled during the interpolation process. Interpolation along the boundaries of the DEM was confined to those areas where data was collected to prevent interpolation edge effects. Grid cells outside of the area of interest appear as NODATA. Final projection of the merged DEM was UTM Zone 6 NAD27, Z-values were in meters, and the grid cell size was five meters.
The grid is also provided as an ASCII comma delimited XYZ file, or a geotiff. Coordinates in the files are Geographic NAD27.
Source_Used_Citation_Abbreviation: Seward LIDAR
Source_Used_Citation_Abbreviation: Seward harbor
Source_Used_Citation_Abbreviation: multibeam bathymetry
Process_Date: 200702
Source_Produced_Citation_Abbreviation: merged DEM
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Keith A. Labay
Contact_Address:
Address_Type: mailling and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Contact_Voice_Telephone: 907-786-7410
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 2141
Column_Count: 1622
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 6
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -147.00
Latitude_of_Projection_Origin: 0.00
False_Easting: 500000
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 5.00
Ordinate_Resolution: 5.00
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: Mean High Water
Altitude_Resolution: 1
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Depth_System_Definition:
Depth_Datum_Name: Mean High Water
Depth_Resolution: 1
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: MS 902 Box 25286 Denver Federal Center
City: Lakewood
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS
Resource_Description: DS 374
Distribution_Liability:
This world-wide web publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government of any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO grid
File_Decompression_Technique: zip file
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/ds/374>
Fees: There is no cost for the download of these digital files
Metadata_Reference_Information:
Metadata_Date: 20080909
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Keith A. Labay
Contact_Address:
Address_Type: mailling and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Contact_Voice_Telephone: 907-786-7410
Contact_Electronic_Mail_Address: klabay@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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