Gridded Data from Multibeam Bathymetric Surveys of Eklutna Lake, Alaska

Identification_Information:

Citation:

Citation_Information:

Originator: Haeussler, Peter J. (ORCID: 0000-0002-1503-6247)
Originator: Praet, Nore (ORCID: 0000-0002-5567-3718)
Originator: Vandekerkhove, Elke
Originator: Vandorpe, Thomas (ORCID: 0000-0002-1461-2484)
Originator: Van Daele, Maarten (ORCID: 0000-0002-8530-4438)
Originator: De Rycker, Koen
Originator: Witter, Robert C. (ORCID: 0000-0002-1721-254X)
Originator: Labay, Keith A. (ORCID: 0000-0002-6763-3190)
Originator: Moernaut, Jasper (ORCID: 0000-0003-3164-4274)
Originator: De Batist, Marc (ORCID: 0000-0002-1625-2080)
Publication_Date: 20220124
Title:

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name:

Gridded Data from Multibeam Bathymetric Surveys of Eklutna, Kenai, and Skilak Lakes, Alaska

Issue_Identification: .

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested Citation: Haeussler, P.J., Praet, N., Vandekerkhove, E., Vandorpe, T., Van Daele, M., De Rycker, K., Witter, R., Labay, K.A., Moernaut, J., De Batist, M., 2022, Gridded data from multibeam bathymetric surveys of Eklutna, Kenai, and Skilak Lakes, Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P9GK6YZG

Online_Linkage: https://doi.org/10.5066/P9GK6YZG
Larger_Work_Citation:

Citation_Information:

Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2007
Title: Alaska Earthquake Hazards
Geospatial_Data_Presentation_Form: website
Series_Information:

Series_Name: Alaska Science Portal
Issue_Identification: 33

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=33

Description:

Abstract:

This data release provides bathymetry data collected in 2015 for Eklutna Lake, Alaska. The data release consists of a 4 m grid, derived from processed and cleaned multibeam data. Depths were corrected using conductivity, temperature, and depth profiles collected during the surveys, and the data were cleaned of spurious returns.

Purpose:

This data was collected to better understand lakes as recorders of seismic events. There was no attempt to collect data shallower than -3.73 m. There were no previous swath bathymetry surveys of this lake.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20150714
Ending_Date: 20150717

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -149.13
East_Bounding_Coordinate: -148.99
North_Bounding_Coordinate: 61.41
South_Bounding_Coordinate: 61.34

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC431

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Theme_Keyword: elevation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: bathymetry and elevation

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: bathymetry

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: multibeam echo sounder

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Earthquake Hazards Program
Theme_Keyword: EHP
Theme_Keyword: Alaska Science Center
Theme_Keyword: ASC

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Eklutna Lake

Access_Constraints: None
Use_Constraints:

None. 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. This information is not intended for navigation purposes.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Cross_Reference:

Citation_Information:

Originator: Praet, N.
Originator: Moernaut, J.
Originator: Van Daele, M.
Originator: Boes, E.
Originator: Haeussler, P.J.
Originator: Strupler, M.
Originator: Schmidt, S.
Originator: Loso, M.G.
Originator: De Batist, M.
Publication_Date: 2017
Title:

Paleoseismic potential of sublacustrine landslide records in a high-seismicity setting (south-central Alaska)

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Marine Geology
Issue_Identification: 384:103-119

Publication_Information:

Publication_Place: online
Publisher: Elsevier

Other_Citation_Details:

Praet, N., Moernaut, J., Van Daele, M., Boes, E., Haeussler, P.J., Strupler, M., Schmidt, S., Loso, M.G., De Batist, M. 2017. Paleoseismic potential of sublacustrine landslide records in a high-seismicity setting (south-central Alaska). Marine Geology 384:103-119 doi:10.1016/j.margeo.2016.05.004

Online_Linkage: https://doi.org/10.1016/j.margeo.2016.05.004

Cross_Reference:

Citation_Information:

Originator: Praet, N.
Originator: Van Daele, M.
Originator: Collart, T.
Originator: Moernaut, J.
Originator: Vandekerkhove, E.
Originator: Kempf, P.
Originator: Haeussler, P.J.
Originator: De Batist, M.
Publication_Date: 2020
Title:

Turbidite stratigraphy in proglacial lakes: Deciphering trigger mechanisms using a statistical approach

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Sedimentology
Issue_Identification: 67(5):2332-2359

Publication_Information:

Publication_Place: online
Publisher: Wiley

Other_Citation_Details:

Praet, N., Van Daele, M., Collart, T., Moernaut, J., Vandekerkhove, E., Kempf, P., Haeussler, P.J., De Batist, M. 2020. Turbidite stratigraphy in proglacial lakes: Deciphering trigger mechanisms using a statistical approach. Sedimentology 67(5):2332-2359 doi:10.1111/sed.12703

Online_Linkage: https://doi.org/10.1111/sed.12703

Cross_Reference:

Citation_Information:

Originator: Alaska Department of Fish and Game
Publication_Date: 2021
Title: Alaska Lake Database (ALDAT)
Geospatial_Data_Presentation_Form: online database
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: Alaska Department of Fish and Game

Online_Linkage: http://www.adfg.alaska.gov/SF_Lakes/

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Our data was compared to non-peer-reviewed data available at http://www.adfg.alaska.gov/SF_Lakes/, and our data are consistent. There is no formal accuracy report.

Logical_Consistency_Report:

The data were examined for outliers and none were found. No data values are equal to -32767.

Completeness_Report:

We did not collect data in shallow areas, generally less than -3.73 m. Where data are absent, we did not collect data.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Prior use of this multibeam echosounder system indicates an overall positional accuracy of about 1 m. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted. The USGS research vessel Lutris was outfitted with a CSI Wireless-brand DGPS MAX unit for position of the vessel. The unit is rated to have sub-meter accuracy at 5 Hz. An iXBlue-brand Octans Subsea gyrocompass and motion sensor was used to determine sensor orientation and attitude. Accuracies of final products are a few decimeters due to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Praet, N.
Publication_Date: Unpublished material
Title:

Gridded data from multibeam bathymetric surveys of Eklutna Lake, Alaska

Geospatial_Data_Presentation_Form: tabular digital data

Type_of_Source_Media: ASCII XYZ file
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20150714
Ending_Date: 20150717

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Eklutna
Source_Contribution: This source constitutes the entire dataset.

Process_Step:

Process_Description:

In the summer of 2015, bathymetric data were acquired using a pole-mounted ELAC SeaBeam 1050 multibeam sonar (ELAC Nautik GmbH) on the USGS research vessel Lutris. This sonar consists of two 50 kHz transducer arrays, operated with a 120° combined swath angle. Sound velocity profiles of the water column were measured multiple times a day with a CastAway® CTD (depths up to 100 m; SonTek) and a CTD 48M (Sea & Sun Technology GmbH). The bathymetric data processing included outlier cleaning with HDPedit (ELAC Nautik GmbH) and incorporating the sound velocity profiles using HDPpost (ELAC Nautik GmbH). Visualization in the IVS 3D FledermausTM software (QPS BV) enabled detailed bathymetric data editing. The final bathymetry map has a 4 m grid spacing and a vertical accuracy of a few decimeters. Because the lake level seasonally fluctuates with maximum lake level at the end of summer and a minimum lake level around spring, the measured depths in the bathymetry maps are in reference to the mean lake level elevation of 258 m (NGVD29) during acquisition, as measured on the USGS Eklutna Lake stream gage (15278000). This corresponds to an elevation of 259.9 m in NAVD88 which is the recommended datum for this survey.

Source_Used_Citation_Abbreviation: Eklutna
Process_Date: 20150717

Process_Step:

Process_Description:

Converted gridded 4 m XYZ file to GeoTIFF using Global Mapper 20.1.

Source_Used_Citation_Abbreviation: Eklutna
Process_Date: 20211207

Process_Step:

Process_Description:

In preparation for the data release the included GeoTIFF was reprojected to geographic coordinates in WGS84 using the Project Raster tool in ArcGIS 10.8.1. This temporary GeoTIFF was then exported as an ASCII grid file using the Raster to ASCII tool in ArcGIS 10.8.1. The no data value in the ASCII grid is the default -9999.

Source_Used_Citation_Abbreviation: Eklutna
Process_Date: 20211207
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Keith Labay
Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Position: Physical Scientist
Contact_Address:

Address_Type: Mailing and Physical
Address: 4210 University Dr.
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:

Raster_Object_Type: Grid Cell
Row_Count: 1873
Column_Count: 1872

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: -147.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 4
Ordinate_Resolution: 4

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: World Geodetic System 1984
Ellipsoid_Name: Geodetic Reference System 1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.2572

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.25
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: Eklutna_bathy_UTM6_WGS84.tif
Entity_Type_Definition: Values associated with GeoTIFF raster dataset
Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Value
Attribute_Definition: Depth in meters to the lakebed
Attribute_Definition_Source: this dataset
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -58.01
Range_Domain_Maximum: -3.73
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Value
Attribute_Definition: No data value
Attribute_Definition_Source: this dataset
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: -32767
Enumerated_Domain_Value_Definition: No data
Enumerated_Domain_Value_Definition_Source: Author defined

Detailed_Description:

Entity_Type:

Entity_Type_Label: Eklutna_bathy_WGS84.asc
Entity_Type_Definition: Values associated with ASCII grid raster dataset
Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Value
Attribute_Definition: Depth in meters to the lakebed
Attribute_Definition_Source: this dataset
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -57.97
Range_Domain_Maximum: -3.74
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Value
Attribute_Definition: No data value
Attribute_Definition_Source: this dataset
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: No data
Enumerated_Domain_Value_Definition_Source: Author defined

Overview_Description:

Entity_and_Attribute_Overview:

This dataset contains bathymetric depth values for Eklutna Lake near the city of Anchorage, Alaska. Values are in negative meters and measured relative to the North American Vertical Datum of 1988.

Entity_and_Attribute_Detail_Citation: Author defined

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Resource_Description:

The U.S. Geological Survey, Alaska Science Center is the authoritative source and distributor of these data.

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, no warranty expressed or implied is made regarding the display or utility of the data for other purposes or on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: GeoTIFF, ASCII
Format_Information_Content:

Data are distributed in a Zip package containing data in: (1) GeoTIFF with an accompanying optional .TFW world file, and (2) ASCII grid with an accompanying required .PRJ projection file, with FGDC metadata in XML and HTML formats.

File_Decompression_Technique:

Compression applied by the 7-Zip utility using default compression (5). The Zip package can be decompressed and unpacked by open source or commercially available unzip tools.

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P9GK6YZG

Fees: None

Technical_Prerequisites:

It is recommended that GIS software such as the free open source program QGIS be used to work with this data.

Gridded Data from Multibeam Bathymetric Surveys of Eklutna Lake, Alaska

Metadata: