Identification_Information: Citation: Citation_Information: Originator: U.S. Army Corps of Engineers JALBTCX Publication_Date: 20050520 Publication_Time: Unknown Title: Neah Bay to Cape Alava, Northwest Coast, Washington State - Topographic Survey Data Edition: 1.1 Geospatial_Data_Presentation_Form: raster digital data Online_Linkage: \\Acoustics2\DATA\hmpr-117-2005-02\Catalog\Bathy\lid10_05 Description: Abstract: 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 a 10 kHz topographic laser. The system was operated from a Beechcraft King Air 90 aircraft. Data were collected with the bathymetric laser while flying at altitudes of about 400 meters and a ground speed of about 124 knots. The topographic laser data was collected at altitudes of about 700 m and a ground speed 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 acurate 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'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 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. Purpose: The purpose of the survey was to obtain the existing near shore bathymetric and topographic conditions along the areas between Neah Bay and Cape Alava located on the Northwestern Coastline of Washington State. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20050418 Single_Date/Time: Calendar_Date: 20050419 Single_Date/Time: Calendar_Date: 20050420 Single_Date/Time: Calendar_Date: 20050421 Single_Date/Time: Calendar_Date: 20050422 Single_Date/Time: Calendar_Date: 20050423 Single_Date/Time: Calendar_Date: 20040524 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -124.793908 East_Bounding_Coordinate: -124.628193 North_Bounding_Coordinate: 48.409543 South_Bounding_Coordinate: 48.149852 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Hydrographic Survey Theme_Keyword: Topographic Survey Theme_Keyword: LIDAR Survey Place: Place_Keyword_Thesaurus: None Place_Keyword: Cape Alava Place_Keyword: Koitlah Point Place_Keyword: Tatoosh Island Place_Keyword: Cape Alava Place_Keyword: WA Place_Keyword: Olympic Coast 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steven S. Intelmann Contact_Organization: Olympic Coast National Marine Sanctuary Contact_Position: Habitat Mapping Specialist Contact_Address: Address_Type: mailing and physical address Address: 115 E. Railroad Avenue Address: Suite 301 City: Port Angeles State_or_Province: WA Postal_Code: 98362 Country: USA Contact_Voice_Telephone: 360-457-6622 Contact_Voice_Telephone: Ext. 22 Contact_Facsimile_Telephone: 360-457-8496 Contact_Electronic_Mail_Address: steve.intelmann@noaa.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 9.1.0.722 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: N/A Completeness_Report: N/A Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: +/- 3 meters (95% confidence) Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: +/- 25 cm (95% confidence) Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Army Corps of Engineers JALBTCX Publication_Date: 20040923 Title: Bathymetric &Topographic LIDAR Survey, Northwest Coast, Washington St. Edition: 1.1 Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20050418 Single_Date/Time: Calendar_Date: 20050419 Single_Date/Time: Calendar_Date: 20050420 Single_Date/Time: Calendar_Date: 20050421 Single_Date/Time: Calendar_Date: 20050422 Single_Date/Time: Calendar_Date: 20050423 Single_Date/Time: Calendar_Date: 20050424 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: None Source_Contribution: FUGRO Pelagos Inc. 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 Ground Control System (GCS) for survey planning and post-processing. The GCS main functions 1) import airborne data stored on removable hard drives; 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 GCS possesses an automated capability to post-process the data to obtain corrected depth and horizontal positions within the specified system accuracies. This is accomplished by accurately identifying the surface and bottom returns from the airborne data. Depths are determined by computing the time difference between the arrival of the surface and bottom returns. Corrections are computed and applied for depth biases associated with light propogation, water level fluctuations, and various inherent system characteristics. Surface waves are modeled and removed so that depths can be referenced to a common mean water surface. Applying tidal corrections and/or KGPS corrections then produces a depth referenced to a known datum. A manual processing capability also allows evaluation of anomalous data by providing display and edit functions of sounding data and system parameters. Digital photos collected once per second (and easilly viewed during editing) permit visual scrutiny of the area to aid the hydrographer in deciding whether to exclude suspect data from further processing. Output from the GCS is a digital data set of XYZ (positions/depths) for each laser sounding that is compatible with most GIS and other contouring and mapping systems. Process_Date: 20050520 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Carol Lockhart Contact_Organization: Fugro Pelagos Contact_Position: Project Manager Contact_Address: Address_Type: mailing and physical address Address: 3738 Ruffin Rd City: San Diego State_or_Province: CA Postal_Code: 92123 Country: U.S.A. Contact_Voice_Telephone: 858 292 8922 Contact_Facsimile_Telephone: 858-292-5308 Process_Step: Process_Description: Both positional information and project control for the LIDAR survey were supplied by the KGPS in the ellipsoidal datum of NAD83. For ease of merging the data set with existing multibeam sounding data, survey instructions required the data to be projected during post-processing and delivered in the UTM Zone 10 projection. The Geoid99 height model was used to convert the vertical datum from the ellipsoidal 3-D datum of NAD83 to the orthometric vertical datum NAVD88. But to accurately merge the LIDAR data with existing multibeam sounding data, the data sets must obviously be in the same vertical reference frame (Milbert 2002). Since the multibeam sounding data were referenced to an averaged tidally-derived vertical datum (MLLW) and the LIDAR data were referenced to an orthometric vertical datum (NAVD88) based on Mean Sea Level (MSL), a VDatum model (Spargo et. al 2006) was used to vertically transform the LIDAR data to MLLW for compatibility and comparison with the multibeam sounding data. The VDatum model relates the NAVD88 to MLLW by using a grid, or zone, of tide model comparisons with known leveled tide benchmark stations to better account for the spatial variability of tidal dynamics over a given area (Milbert 2002; Spargo et. al 2006). The VDatum model that was used is available for download at http://chartmaker.ncd.noaa.gov/csdl/vdatum_projectsWA.htm. Process_Date: April 2006 Process_Time: Unknown Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Olympic Coast National Marine Sanctuary Contact_Person: Steven S. Intelmann Contact_Position: Habitat Mapping Specialist Contact_Address: Address_Type: mailing and physical address Address: 115 E. Railroad Avenue Address: Suite 301 City: Port Angeles State_or_Province: WA Postal_Code: 98362 Country: USA Contact_Voice_Telephone: 360-457-6622 Contact_Voice_Telephone: Ext. 22 Contact_Facsimile_Telephone: 360-457-8496 Contact_Electronic_Mail_Address: steve.intelmann@noaa.gov Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\intels\LOCALS~1\Temp\xml29.tmp Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\intels\LOCALS~1\Temp\xml2A.tmp Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Neah Bay to Cape Alava, Northwest Coast, Washington St. Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 14309 Column_Count: 5831 Vertical_Count: 1 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: 0.999600 Longitude_of_Central_Meridian: -123.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 2.000000 Ordinate_Resolution: 2.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 - Transformed to MLLW Altitude_Resolution: 0.01 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Depth_System_Definition: Depth_Datum_Name: Mean lower low water Depth_Resolution: 0.01 Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Distribution_Information: Distributor: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 335.866 Metadata_Reference_Information: Metadata_Date: 20060531 Metadata_Review_Date: 20050523 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Eddie Culppeper Contact_Organization: U.S. Army Corps of Engineers, Spatial Data Brach (OP-J) Contact_Address: Address_Type: mailing and physical address Address: 109 St. Joseph St. City: Mobile State_or_Province: Alabama Postal_Code: 36602 Country: U.S.A. Contact_Voice_Telephone: 251 690-3467 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile