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Dahlia Shoals, Lake Michigan, Michigan

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

US Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise.(ed.)

Publication_Date: 20011000

Title: Dahlia Shoals, Lake Michigan, Michigan

Edition: 1.1

Geospatial_Data_Presentation_Form: XYZ ASCII

Larger_Work_Citation:

Citation_Information:

Originator: Peter Barnes

Originator: Guy Fleisher

Originator: James V. Gardner

Originator: Kristen Lee

Publication_Date: 2003

Title:

Bathymetry and selected perspective views of 6 reef and coastal areas in Northern Lake Michigan

Series_Information:

Series_Name: USGS Open-File Report

Issue_Identification: USGS OFR 03-120

Publication_Information:

Publication_Place: Menlo Park, CA

Publisher: U.S. Geological Survey

Online_Linkage: <http://geopubs.wr.usgs.gov/open-file/of03-120>

Description:

Abstract:

XYZ ASCII format generated from 2001 Lidar survey. These data were collected by the SHOALS (Scanning Hydrographic Operational Airborne Lidar Survey) system which consists of an airborne laser transmitter/receiver capable of measuring 400 soundings per second.

Purpose:

The purpose of the survey was to provide bathymetry and albedo dat for utilization in habitat studies.

Supplemental_Information:

The system operates from a deHavilland DHC-6 Twin Otter flying at altitudes between 200 and 400 meters with a ground speed of about 100 knots. The SHOALS system also includes a ground-based data processing system for calculating acurate horizontal position and water depth. Lidar is an acronym for LIght Detection And Ranging. The system operates by emitting a pulse of light that travels from an airborne platform to the water surface where a small portion of the laser energy is backscattered to the airborne receiver. The remaining energy at the water's surface propogates through the water column and reflects off the sea bottom and back to the airborne detector. The time difference between the surface return and the bottom return corresponds to water depth. The maximum depth the system is able to sense is related to the complex interaction of radiance of bottom material, incident sun angle and intensity, and the type and quantity of organics or sediments in the water column. As a rule-of-thumb, the SHOALS system should be capable of sensing bottom to depths equal to two or three times the Secchi depth.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20010800

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -085.242000

East_Bounding_Coordinate: -085.158000

North_Bounding_Coordinate: +45.670000

South_Bounding_Coordinate: +45.600000

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: lidar survey

Theme_Keyword: Hydrographic Survey

Theme_Keyword: Lake Michigan

Theme_Keyword: Dahlia Shoals

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Lake Michigan

Place_Keyword: Dahlia Shoals

Access_Constraints: None

Use_Constraints:

Acknowledgement of the U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBCTX) would be appreciated in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Army Corps of Engineers JALBCTX

Contact_Address:

Address_Type: mailing and physical address

Address: 109 St. Joseph Street

City: Mobile

State_or_Province: Alabama

Postal_Code: 36602

Country: USA

Contact_Voice_Telephone: (334) 694-3721

Contact_Facsimile_Telephone: (334) 690-3464

Cross_Reference:

Citation_Information:

Originator:

US Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise.(ed.)

Publication_Date: 20011000

Title: Boulder Reef, Lake Michigan, Michigan

Online_Linkage:

<http://walrus.wr.usgs.gov/infobank/t/t101lm/html/t-1-01-lm.meta.html>

Native_Data_Set_Environment:

SunOS, 5.8, sun4u UNIX ArcInfo version 8.0.2

Browse_Graphic:

Browse_Graphic_File_Name:

<http://geopubs.wr.usgs.gov/open-file/of03-120/images/map/newdahlia_mapL.jpg>

Browse_Graphic_File_Description: Shaded relief map view of Dahlia Shoals

Browse_Graphic_File_Type: JPEG

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

SHOALS has demonstrated capabilities that meet US Army Corps of Engineers Hydrographic Survey accuracy requirements for Class 1 surveys and the International Hydrographic Organization nautical charting standards for Order 1.

Logical_Consistency_Report: None

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: +/- 3 meters (1 sigma)

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: +/- 15 cm (1 sigma)

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Army Corps of Engineers JALBTCX

Publication_Date: 20011000

Title: Dahlia Shoals, Lake Michigan, Michigan

Edition: 1.1

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20010800

Source_Currentness_Reference: Ground Condition

Source_Citation_Abbreviation: None

Source_Contribution: SHOALS

Process_Step:

Process_Description:

The SHOALS airborne system acquires a tremendous volume of raw data during a single mission. The lidar data are unique and require a specialized Data Processing System (DPS) for post-processing. The DPS main funcions 1) import airborne data stored on high density data tape; 2) perform quality control checks on initial depths and horizontal positions; 3) provide display and edit capabilities; 4) calculate depth and position (XYZ) values for each sounding; and 5) output final positions and depths for each sounding.

Process_Date: 20010900

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Dahlia Shoals, Lake Michigan, Michigan

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00004

Longitude_Resolution: 0.00004

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: WGS84

Ellipsoid_Name: WGS84

Semi-major_Axis: 6378137.00 meters

Denominator_of_Flattening_Ratio: 0.003352811

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Each record consists of three fields: longitude, latitude, and depth in meters. Example of records:

 -85.227030085 45.625738034 152.33000
 -85.226539268 45.626400990 153.21000
 -85.226525081 45.626090234 152.82000
 -85.226510770 45.625144904 152.49000
            

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S Geological Survey

Contact_Person: Peter Barnes

Contact_Address:

Address_Type: mailing and physical address

Address: MS999 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025

Contact_Voice_Telephone: 916-329-5265

Distribution_Liability:

These data not intended for navigational purposes.

Although these data have been used by the U.S. Geological Survey, U.S. Departmempnt of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for cisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.

Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://geopubs.wr.usgs.gov/open-file/of03-120>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20030130

Metadata_Review_Date: 20030200

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS

Contact_Person: Kristen Lee

Contact_Position: Physical Science Technican

Contact_Address:

Address_Type: mailing and physical address

Address: USGS, MailStop 999, 345 Middlefield Road

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025-3561

Country: USA

Contact_Voice_Telephone: (650) 329-5260

Contact_Facsimile_Telephone: (650) 329-5411

Contact_Electronic_Mail_Address: kmlee@usgs.gov

Metadata_Standard_Name:

Content Standard for Digital Geospatial Metadata ("CSDGM version 2")

Metadata_Standard_Version: FGDC-STD-001-1998