Ewa, Oahu, HI

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Citation: Citation_Information: Originator: US Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise.(ed.) Publication_Date: Title: Ewa, Oahu, HI Edition: 1.1 Geospatial_Data_Presentation_Form: Map Publication_Information: Publication_Place: Publisher: Other_Citation_Details: Online_Linkage: Larger_Work_Citation: Citation_Information: Originator: Publication_Date: Title: Publication_Information: Publication_Place: Publisher: Online_Linkage: 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. 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. Purpose: The purpose of the Maui survey was to investigate the beach and near-shore bathymetry around the Maui coastline. Supplemental_Information: Horizontal_Positional_Accuracy_Report: +/- 3 meters (1 sigma) Vertical_Positional_Accuracy_Report: +/- 15 cm (1 sigma) Depth_Datum_Name: Mean lower low water Depth_Resolution: 0.1 Depth_Distance_Units: feet (???) Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: Ending_Date: Currentness_Reference: Ground Condition Status: Progress: Complete Maintenance_and_Update_Frequency: Continually Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -158.1340 East_Bounding_Coordinate: -157.8851 North_Bounding_Coordinate: 21.3292 South_Bounding_Coordinate: 21.2550 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: SHOALS Theme_Keyword: Scanning Hydrographic Operational Airborne Lidar Survey Theme_Keyword: Bathymetry Theme_Keyword: lidar survey Theme_Keyword: Hydrographic Survey Place: Place_Keyword_Thesaurus: None Place_Keyword: Oahu Place_Keyword: Hawaii Place_Keyword: US Access_Constraints: 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_Person: Contact_Position: Contact_Address: Address_Type: mailing and physical address Address: 109 St. Joseph Street City: Mobile State_or_Province: Alabama Postal_Code: 36602 Country: Contact_Voice_Telephone: 334-690-3467 Contact_Facsimile_Telephone: 334-690-3464 Contact_Electronic_Mail_Address: Hours_of_Service: Native_Data_Set_Environment: ArcView version 3.2 shapefile format Top