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Open-File Report 03-120

Dahlia Shoals, Lake Michigan, Michigan

Metadata also available as

Metadata:

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: ArcInfo GRID
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:
ArcInfo GRID 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. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command.
Process_Date: 20010900
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 16
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -85.20000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 0.00
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 4.0
Ordinate_Resolution: 4.0
Planar_Distance_Units: Meters
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:

dahliagrd is an ArcInfo GRID with the following attributes:

Cell Size = 4.000

Data Type: Floating Point

Number of Rows = 2152

Number of Columns = 1439

BOUNDARY

Xmin = 638209.450

Xmax = 643965.450

Ymin = 5051545.406

Ymax = 5060153.406

STATISTICS

Minimum Value = -180.200

Maximum Value = -146.200

Mean = -161.207

Standard Deviation = 4.932

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: ArcInfo GRID
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
Generated by mp version 2.7.9 on Wed Apr 9 13:28:16 2003

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URL: http://pubsdata.usgs.gov/pubs/of/2003/0120/metadata/dahliagrd.html
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Page Last Modified: Thursday, 03-Apr-2014 10:21:40 EDT