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Neah Bay to Cape Alava, Northwest Coast, Washington State - Topographic Survey Data

Metadata Updated: March 13, 2024

These data were collected by the SHOALS-1000T(Scanning Hydrographic Operational Airborne Lidar Survey)system which consists of an airborne laser transmitter/receiver with a 1kHz. bathymetric laser and a10 kHz topographic laser. The system was operated from a Beechcraft King Air 90aircraft. Data were collected with the bathymetric laser while flying at altitudes of about 400 meters and a groundspeed of about 124 knots. The topographic laser data was collected at altitudes of about 700 m and a groundspeed of 150 kts. One KGPS base stations was used during processing of the dataset. The SHOALS system includes a ground-based data processing system for calculating accurate horizontal position and water depth / elevation. 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\x92s surface propagates 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 sunangle and intensity, and the type and quantity of organics or sediments in the water column. As a rule-of-thumb, the SHOALS 1000 system is capable of sensing bottom to depths equal to two or three times the Secchi depth. Topographic elevations are gridded in this dataset.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Date February 29, 2024
Metadata Created Date November 12, 2020
Metadata Updated Date March 13, 2024
Reference Date(s) May 20, 2005 (publication)
Frequency Of Update unknown

Metadata Source

Harvested from NOS ONMS

Additional Metadata

Resource Type Dataset
Metadata Date February 29, 2024
Metadata Created Date November 12, 2020
Metadata Updated Date March 13, 2024
Reference Date(s) May 20, 2005 (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:40077
Access Constraints Cite As: Office of National Marine Sanctuaries, [Date of Access]: Neah Bay to Cape Alava, Northwest Coast, Washington State - Topographic Survey Data [Data Date Range], https://www.fisheries.noaa.gov/inport/item/40077., Access Constraints: None, Use Constraints: Acknowledgement of the existing conditions of the nearshore bathymetry and beach would be appreciated in products derived from these data., Distribution Liability: Unknown
Bbox East Long -124.628193
Bbox North Lat 48.409543
Bbox South Lat 48.149852
Bbox West Long -124.793908
Coupled Resource
Frequency Of Update unknown
Harvest Object Id b9fbc996-2f22-4726-8858-44f918b78571
Harvest Source Id f705727e-6c56-4072-92cc-ce5c5c5b4688
Harvest Source Title NOS ONMS
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Lineage
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-124.793908, 48.149852], [-124.628193, 48.149852], [-124.628193, 48.409543], [-124.793908, 48.409543], [-124.793908, 48.149852]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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