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Bathymetry at Pleasure Point

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey, Coastal and Marine Geology Program
Publication_Date: 2007
Title: Bathymetry at Pleasure Point
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
The Coastal Profiling System (CPS), a hydrographic surveying system mounted on a Personal Watercraft (PWC) originally designed by Oregon State University (Beach et al., 1996; Côté, 1999; MacMahan, 2001) to collect data in energetic nearshore environments, is now being used in many other areas to collect regional bathymetric data.
Purpose:
This data will be combined with other bathymetric data in the area to create a map of the region.
Supplemental_Information:
A description of the methodology used to collect data with the Coastal Profiling System is available in the Washington Department of Ecology Report: Beach Monitoring in the Columbia River Littoral Cell, 1997 - 2000.

The following is a list of publications cited in this report:

Beach, R.A.; Holman, R.A.; and Stanley, J., 1996. Measuring nearshore bathymetry on high energy beaches. American Geophysical Union Fall Meeting, 1996, F286.

Cote, J.M., 1999. The measurement of nearshore bathymetry on Intermediate and dissipative beaches. Unpublished Masters Thesis, Oregon State University, Corvallis, Oregon, 102 pp.

Gelfenbaum, G., Sherwood, C.R., Kerr, L.A., and Kurrus, K., 2000, Grays Harbor wave refraction experiment 1999: Data report, U.S. Geological Survey Open File Report, OF 00-44, 132 pp.

MacMahan, J., 2001. Hydrographic surveying from a personal watercraft. Journal of Surveying Engineering, 127(1), 12-24.

Ruggiero, P., and Voigt, B., 2000. Beach monitoring in the Columbia River littoral cell, 1997-2000, Washington Department of Ecology Publication # 00-06-26, Olympia, WA, 112 pp.

Additional information about the data collection field activity, W-1-05-PS, is at URL: <http://walrus.wr.usgs.gov/infobank/w/w105ps/html/w-1-05-ps.meta.html>.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050315
Beginning_Time: 155400
Ending_Date: 20050317
Ending_Time: 205200
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.5894
East_Bounding_Coordinate: -123.528
North_Bounding_Coordinate: 48.1542
South_Bounding_Coordinate: 48.1377
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme:
Theme_Keyword_Thesaurus:
ISO 19115 Topic Category <http://gcmd.gsfc.nasa.gov/User/difguide/iso_topics.html>
Theme_Keyword: inlandWaters
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus:
Global Change Master Directory (GCMD) <http://gcmd.gsfc.nasa.gov/>
Theme_Keyword: bathymetry
Theme_Keyword: GPS
Theme_Keyword: sediment transport
Theme:
Theme_Keyword_Thesaurus: bathymetry
Theme_Keyword: Global Positioning System
Theme_Keyword: hydrographic surveying
Theme_Keyword: river mouth
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Pleasure Point
Place_Keyword: Monterey Bay
Place_Keyword: Santa Cruz
Place_Keyword: California
Access_Constraints: None
Use_Constraints:
Users must assume liability to determine the appropriate use of these data. This data set is not to be used for legal purposes. The Coastal and Marine Geology Program, U.S. Geological Survey should be acknowledged as the data source in products derived from these data. Please contact the USGS for more detailed information if required.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Ruggiero
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Coastal Engineer
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-999
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: 650-329-5433
Contact_Facsimile_Telephone: 650-329-5190
Contact_Electronic_Mail_Address: pruggiero@usgs.gov
Data_Set_Credit:
These data were collected by the U.S. Geological Survey Coastal and Marine Geology Program.
Native_Data_Set_Environment: ASCII text file, Windows NT 4.0 OS.

Data_Quality_Information:
Logical_Consistency_Report:
The fidelity of the data is ensured via the use of survey grade GPS receivers and a geodetic control monument.
Completeness_Report:
The data is visually inspected for gross inaccuracies using a variety of software packages including HYPACK (Coastal Oceanographics Inc.) and Matlab (Mathworks Inc.).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The survey-grade GPS equipment used in the monitoring program (Trimble 4000 series receivers) have manufacturer reported Root Mean Square (RMS) accuracies of approximately ±3-cm + 2ppm of baseline length (typically 10 km or less) in the horizontal while operating in Real Time Kinematic surveying mode (Trimble Navigation Limited, 1998). These reported accuracies are, however, additionally subject to multi-path, satellite obstructions, poor satellite geometry, and atmospheric conditions. While the horizontal uncertainty of individual data points is approximately 0.05 m, the CPS III operators cannot stay 'on line' at all times to this level of accuracy. Typically, mean offsets are less than 2.0 m from the preprogrammed track lines and maximum offsets along the approximately 2 km long transects are typically less than 10.0 m.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 0.05
Horizontal_Positional_Accuracy_Explanation:
The survey-grade GPS equipment used in the monitoring program (Trimble 4000 series receivers) have manufacturer reported RMS accuracies of approximately ±3-cm + 2ppm of baseline length (typically 10 km or less) in the horizontal while operating in Real Time Kinematic surveying mode (Trimble Navigation Limited, 1998).
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The survey-grade GPS equipment used in the monitoring program (Trimble 4000 series receivers) have manufacturer reported RMS accuracies of approximately ±5-cm + 2ppm of baseline length (typically 10 km or less) in the vertical while operating in Real Time Kinematic surveying mode (Trimble Navigation Limited, 1998). These reported accuracies are, however, additionally subject to multi-path, satellite obstructions, poor satellite geometry, and atmospheric conditions that can combine to cause a vertical GPS drift that can be as much as 10-cm. While repeatability tests and merges with topographic data suggest sub-decimeter vertical accuracy (MacMahan, 2001), variability in water temperature (not usually measured) can affect depth estimates by as much as 3 % of the water depth. For fresh water, the speed of sound is probably closer to 1450 m/s and would affect depth estimates by approximately 5 cm, due to the shallow depth in most of the lake.
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.15
Vertical_Positional_Accuracy_Explanation:
The survey-grade GPS equipment used in the monitoring program (Trimble 4000 series receivers) have manufacturer reported RMS accuracies of approximately ±5-cm + 2ppm of baseline length (typically 10 km or less) in the vertical while operating in Real Time Kinematic surveying mode (Trimble Navigation Limited, 1998). Detailed laboratory tests, field tests (bar check), repeatability tests and merges with topographic data also suggest sub-decimeter vertical accuracy (MacMahan, 2001).
Lineage:
Process_Step:
Process_Description:
A Real Time Kinematic Differential Global Positioning System (RTK DGPS) base station is setup on a control monument. An RTK DGPS base station consists of a Trimble 4400 receiver, a Trimble non-micro centered L1/L2 GPS antenna with a ground plane, a Pacific Crest UHF radio modem, radio antenna, two tripods, and various cables. The GPS antenna is mounted onto a tripod that is leveled over the monument. Once leveled the tripod is secured with sand bags and the antenna is connected to the GPS receiver via a data cable. The radio modem and antenna are attached to the second tripod and connected to the GPS receiver via a data cable. After all connections have been made, the Trimble 4400 receiver is started using a TDC1 or TSC1 handheld data logger and the radio modem is turned on.
Process_Date: 2007
Process_Step:
Process_Description:
The Third Generation Coastal Profiling System (CPSIII) consists of a personal watercraft equipped with a GPS receiver and antenna, an echo sounder, a monitor for visual aid, a keypad for operator control, and a computer running hydrographic surveying software for navigation, data collection, and data analysis (MacMahan, 2001).

The PWC used for the CPSIII is a 2003 Honda AquaTrax F-12 chosen because of its stability, compartment space, and relatively low price. The 3-man PWC measures 3.20 m in length, 1.25 m in width, and 1.06 m in height. During normal surveying operation, the wave runner travels at approximately 3 m/s (6 knots) and can operate for approximately 5 hours on one 60-L fuel tank. The instruments are placed on a bracket at the stern of the vessel, and forward upper part of the vessel in front of the handlebars. On the stern bracket are three large watertight cases, which house the GPS, computer, echo sounder electronics and batteries. In the computer case, the echo sounder and the laptop computer are mounted. This case has six external watertight connectors: one is for serial communication with the GPS, one for the echo sounder transducer, one for the external screen, one for the external 17 button keypad, one for power, and one spare. The complete system is powered by two gel cell 12-volt marine batteries, configured in parallel and housed in a Pelican box mounted on the bracket at the stern of the PWC. The system draws 12 volts at approximately 5 amps.

Horizontal and vertical positioning of the CPSIII is obtained using a Trimble 4700 GPS receiver, which is enclosed in a waterproof Pelican box placed on the bracket at the stern of the PWC. Also within the GPS case is the GPS radio modem (Pacific Crest) that is used to communicate with the shore base station. A small bracket is attached to the topside stern of the vessel for mounting the L1/L2 microcentered GPS antenna and the radio antenna. The GPS antenna is mounted approximately 119 cm directly above the echo sounder transducer.

The echo sounder is an ESE-50 single frequency echo sounder with a 200 kHz transducer manufactured by Flash Fire Technology, Inc. This echo sounder has adjustable gains, offset, and serial outputs. The sampling rate is a function of water depth with an approximate sampling rate of 8 Hz applied in shallow water (0-10 m). The transducer has a 10 - degree conical beam width and generates a pulse at 200 kHz. The echo sounder transducer is mounted on a removable and adjustable arm at the stern of the vessel. The electronics of the echo sounder were reconfigured along with a Big Bay Technologies Inc. P3 mini PC, placed in a watertight Pelican Case. The CPSIII collects data at 5 Hz and while traveling at 3 m/s generates a depth sounding every 0.6 meters along the sea floor.

Navigation and surveying are aided by the use of a monitor (12 inch Big Bay Technologies outdoor high bright display) which is mounted in a watertight case on a bracket forward of the handlebars. A small 17-button programmable Logic Controls keypad (24 cm X 8.9 cm X 3.2 cm) is placed in a waterproof radio bag mounted on the handlebars.

Process_Date: 2007
Process_Step:
Process_Description:
HYPACK hydrographic surveying software is used as the data synchronization software and navigation system. Hypack allows visual observation of trackline, distance offline, depth, latitude, longitude, easting, northing, corrected depth, filename, line number, satellite quality, number of satellites, collection mode, and recording mode. All of this information is useful to the operator when collecting hydrographic data.

HYPACK allows for surveying within a user-defined coordinate system, in this case NAD83 Washington State Plane (4602) - North and NAVD88. As the GPS base station is set up over a monument and survey accurate data is stored in HYPACK in the appropriate datum.

The CPSIII has the ability to survey preset track lines and data is collected only when the PWC operator selects a line. The PWC operator maneuvers the vessel to one end of the line and drives along the track until the vessel is in a water depth of approximately 1 m.

Process_Date: 2007
Process_Step:
Process_Description:
Each nearshore profile is examined, typically using a Perl script, to detect and remove any obvious outliers from the raw files that are either shallower than the echo sounder blanking interval or deeper than a user defined cutoff value.
Process_Date: 2007
Process_Step:
Process_Description:
Each nearshore profile is viewed using HYPACK’s editor. Here, any obviously bad data points that did not get eliminated by the previous processing step are removed by highlighting the point and deleting it from the record. Individual files are then exported from HYPACK in Easting, Northing, Elevation ASCII triplets with one data file per nearshore profile. These files, which have been run through the Perl script and the HYPACK editor are considered the ‘raw’ data files.
Process_Date: 2007
Process_Step:
Process_Description:
Since the echo sounders did not measure water temperature and therefore did not correct the speed of sound in water in real time, all data have been corrected to adjust the vertical coordinate for the actual speed of sound based on water temperatures measured by local wave buoys (see Excel file ew_enviro_cond_05.xls). Further, no measurements of salinity were made or were available from local buoys. A sensitivity analysis was performed to investigate the effect of salinity and temperature variations, hence speed of sound adjustment on a profile. The results show that a normal range of water temperature can have a measurable affect on depths. A worst case inducement of error, when the water temperature estimate is approximately 10 degrees C different from the actual water temperature, results in approximately 0.20 m of vertical change at a water depth of 11 m. The temperature chosen to correct each profile is taken as the average of the surface water temperatures recorded at the closest wave buoy to the data collection site over the times when data collection occurred at that particular sub-cell. Two standard deviations of all water temperature estimates chosen to correct the profiles (more than 90 samples) is less than 3 degrees C. Therefore, the majority of nearshore profiles have been vertically adjusted by less than 10-cm.

The salinity is fixed at 31 psu for all lines as its small variations in the sampling region (Gelfenbaum et al., 2000) had a negligible effect when performing a speed of sound correction to the data.

Process_Date: 2007
Process_Step:
Process_Description:
Finally, a smoothing operation is performed using a running median filter on the vertical coordinate in the onshore direction to reduce high frequency fluctuations from the nearshore bathymetry data. Varying window sizes are used to obtain a smooth profile while maintaining the integrity of the actual data points. These files, which have been processed through the Perl script, the HYPACK editor, corrected for vertical offsets, speed of sound, and salinity, and smoothed are considered the ‘final’ data files.
Process_Date: 2007
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Ruggiero
Contact_Organization: U.S. Geological Survey
Contact_Position: Coastal Engineer
Contact_Address:
Address_Type: mailing and physical address
Address:
Coastal and Marine Geology Program, MS-999,
345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: 650-329-5433
Contact_Facsimile_Telephone: 650-329-5190
Contact_Electronic_Mail_Address: pruggiero@usgs.gov

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point

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: 0.9996000000
Longitude_of_Central_Meridian: 123.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 0.05
Ordinate_Resolution: 0.05
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: D WGS 1984
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ppdata_raw.xyz
Entity_Type_Definition: ASCII text file.
Entity_Type_Definition_Source: U.S. Geological Survey, Coastal and Marine Geology Program
Attribute:
Attribute_Label: Easting
Attribute_Definition: Easting coordinate position.
Attribute_Definition_Source: U.S. Geological Survey, Coastal and Marine Geology Program
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 590719.29
Range_Domain_Maximum: 592729.68
Attribute_Units_of_Measure: decimal meters
Attribute_Measurement_Resolution: 0.05
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 0.05
Attribute_Value_Accuracy_Explanation: +/- meters
Attribute_Measurement_Frequency: Irregular
Attribute:
Attribute_Label: Northing
Attribute_Definition: Value of the Northing coordinate
Attribute_Definition_Source: U.S. Geological Survey, Coastal and Marine Geology Program
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4089643.98
Range_Domain_Maximum: 4091003.41
Attribute_Units_of_Measure: decimal meters
Attribute_Measurement_Resolution: 0.05
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 0.05
Attribute_Value_Accuracy_Explanation: +/- meters
Attribute_Measurement_Frequency: Irregular
Attribute:
Attribute_Label: Elevation
Attribute_Definition: Elevation measurement of the data point
Attribute_Definition_Source: U.S. Geological Survey, Coastal and Marine Geology Program
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -11.89
Range_Domain_Maximum: -0.01
Attribute_Units_of_Measure: decimal meters
Attribute_Measurement_Resolution: 0.15
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 0.15
Attribute_Value_Accuracy_Explanation: +/- meters
Attribute_Measurement_Frequency: Irregular
Detailed_Description:
Entity_Type:
Entity_Type_Label: ppdata_proc.xyz
Entity_Type_Definition: ASCII text file.
Entity_Type_Definition_Source: U.S. Geological Survey, Coastal and Marine Geology Program
Overview_Description:
Entity_and_Attribute_Overview: 2 ASCII text files that include: Easting, Northing, Elevation.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey, Coastal and Marine Geology Program

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Person: Peter Ruggiero
Contact_Position: Coastal Engineer
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-999
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: 650-329-5433
Contact_Facsimile_Telephone: 650-329-5190
Contact_Electronic_Mail_Address: pruggiero@usgs.gov
Distribution_Liability:
Users must assume liability to determine the appropriate use of these data. This data set is not to be used for legal purposes. The Coastal and Marine Geology Program, U.S. Geological Survey should be acknowledged as the data source in products derived from these data. Please contact the U.S. Geological Survey for more detailed information if required.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Fees:
May involve cost recovery for production of CD-ROM. Please contact Peter Ruggiero for additional information and report availability.
Ordering_Instructions: Contact Peter Ruggiero at the U.S. Geological Survey.
Custom_Order_Process:
Please contact Peter Ruggiero at the U.S. Geological Survey for ordering information.

Metadata_Reference_Information:
Metadata_Date: 20060307
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Ruggiero
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Coastal Engineer
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-999
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: 650-329-5433
Contact_Facsimile_Telephone: 650-329-5190
Contact_Electronic_Mail_Address: pruggiero@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time


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