SCBPS Survey Archive

(179) Survey Home

id 356

Submit_Time 2007-02-09 16:18:46

SurveyID 179

Originator Scripps Institution of Oceanography

Publication_Date 2007-02-02

Title February 2007 Sand Level Measurements in Nearshore Southern California.

Abstract This data set contains 4-column ASCII survey point data from a strip of San Diego County Coastline (including: back beach, beach and swash zone from Torrey Pines State Beach). Terrestrial data was collected using a combination of ATV (Yamaha Grizzly) and pushcart dolly survey systems mounted with in-kind GPS receivers. The survey consisted of 199 variably spaced (25-50 meters in the alongshore) cross-shore transects spanning 8km of beach between the Scripps Pier and Torrey Pines State Beach collected over a multi-day period. Bathymetric data were collected from approximately 2 hours prior to until approximately 2 hours following high tide during multiple consecutive 24-hour spring tide events. Terrestrial data were collected from approximately 2 hours prior to until approximately 2 hours following low tide during multiple consecutive 24-hour spring tide events. One GPS base station (on top of the Center For Coastal Studies Building) was in operation during the survey. The Integrative Oceanography Department, Scripps Institution of Oceanography, UCSD owns and operates the survey systems.

Purpose The data described in this document will be compared with forthcoming data sets to determine rates of shoreline change along the San Diego County Coastline and as a ground truth for simultaneous Lidar surveys as scheduled.

Supplemental_Information The in-house dual transducer sonar system has the following specifications: operating frequency = 192 kHz; sampling frequency = 20 Hz; transmit transducer is 8 degree transmit transducer; receive transducer is 20 degree receive transducer. Bathymetric (WaveRunner) and terrestrial (ATV) systems utilizing Ashtech Global Positioning System (GPS) receivers (Z-Extreme) provide platform positioning. The GPS receivers record pseudo-range and phase information for post-processing. Bathymetric GPS receiver sample rate is 5Hz. Terrestrial GPS receiver sample rates are 1 Hz. Platform (WaveRunner and ATV) orientation is determined with a GyroTrac Gyro recording roll, pitch and yaw at 10 Hz. In addition to post-processed data 1 Hz real-time kinematic carrier phase differentially corrected data are also acquired as a navigation aid and as a supplement to post-processed data.

Beginning_Date 2007-02-02

Beginning_Time 23:54:00

Ending_Date 2007-02-03

Ending_Time 01:16:00

Currentness_Reference ground condition

Progress Complete

Maintenance_and_Update_Frequency As needed

West_Bounding_Coordinate -117.2630890000

East_Bounding_Coordinate -117.2510650000

North_Bounding_Coordinate 32.9413550000

South_Bounding_Coordinate 32.8662770000

Theme_Keyword_Thesaurus None

Theme_Keyword ATV

Place_Keyword_Thesaurus None

Place_Keyword NCEX-TORREY

Temporal_Keyword_Thesaurus None

Temporal_Keyword 2007, February

Access_Constraints None

Use_Constraints None

Logical_Consistency_Report Not Applicable

Completeness_Report This survey was completed in a single evening. Driver (POS Region): kent Driver (NCEX Region): ian POS region spans T84-T111, NCEX region spans T34-T57 Low tide was at 3:44pm -1.1 The rivermouth was flowing and not passable Bathtub rock was passable. SIO Base Station: Lat: 32 deg 51 min 58.95411 sec Lon: -117 deg 15 min 14.23074 sec Height: -21.753 meters GPS sampling was 5Hz for the ATV and 5Hz for the Base. ATV antenna height 1.846M. dollygeoidposncex.m was used to filter the data because the brick was not working correctly.

Process_Description Transfer raw GPS data from base station and rover Ashtech GPS receivers for each of the surveys conducted to processing computer.

Latitude_Resolution 0.0000000001

Longitude_Resolution 0.0000000001

Geographic_Coordinate_Units Decimal degrees

Horizontal_Datum_Name North American Datum of 1983

Ellipsoid_Name Geodetic Reference System 80

Semi_major_Axis 6378137.0000000000

Denominator_of_Flattening_Ratio 298.2572326660

Altitude_Datum_Name North American Vertical Datum of 1988

Altitude_Resolution 0.0001000000

Altitude_Distance_Units meters

Altitude_Encoding_Method Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Overview 3-column

Metadata_Date 2007-02-09

Contact_Organization Scripps Institution of Oceanography

Contact_Person Robert Guza

Contact_Position Co-Principle Investigator

Address_Type mailing

Address 9500 Gilman Drive

City La Jolla

State_or_Province CA

Postal_Code 92093-0214

Country United States

Contact_Voice_Telephone 858-534-3032

Metadata_Standard_Name FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version FGDC-STD-001-1998

CDIP Homepage Official UCSD Web Page