Lake Tahoe SHOALS Data

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: 20011101
Title: Lake Tahoe SHOALS Data
Edition: 1.1
Geospatial_Data_Presentation_Form: ArcInfo export

Description:

Abstract:

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 Lake Tahoe survey was to collect bathymetry data from the shoreline to -10 meter depths.

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: 20000700

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.162778

East_Bounding_Coordinate: -119.932500

North_Bounding_Coordinate: +39.260278

South_Bounding_Coordinate: +38.930278

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: lidar survey
Theme_Keyword: Hydrographic Survey
Theme_Keyword: Lake Tahoe

Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Lake Tahoe

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

Contact_Voice_Telephone: 334-690-3467

Contact_Facsimile_Telephone: 334-690-3464


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: 20001200

Title: Lake Tahoe

Edition: 1.1

Type_of_Source_Media: CD-ROM

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20000700

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: 2000


Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Lake Tahoe


Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 10

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -123.00000

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: 10.0

Ordinate_Resolution: 10.0

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


Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USACE, SACRAMENT DISTRICT

Contact_Person: Phillip Brozek

Contact_Address:

Address_Type: mailing and physical address

Address:

CESPK-PM-C

1325 J STREET

City: SACRAMENTO

State_or_Province: CA

Postal_Code: 95819-2922

Contact_Voice_Telephone: 916-557-7630

Distribution_Liability: None


Metadata_Reference_Information:

Metadata_Date: 20001200

Metadata_Review_Date: 20000200

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USACE, SACRAMENTO DISTRICT

Contact_Person: Phillip Brozek

Contact_Address:

Address_Type: mailing and physical address

Address:

CESPK-PM-C 1325 J STREET

City: SACRAMENTO

State_or_Province: CA

Postal_Code: 95819-2922

Contact_Voice_Telephone: 916-557-7630

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 Nov 14 12:03:13 2001