id 363
Submit_Time 2007-03-05 14:28:07
SurveyID 186
Originator Scripps Institution of Oceanography
Publication_Date 2007-03-02
Title March 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 an ATV (Yamaha Grizzly) with GPS receiver. 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. 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 ATV system utilizes Ashtech Global Positioning System (GPS) receivers (Z-Extreme) provide platform positioning. The GPS receivers record pseudo-range and phase information for post-processing. Terrestrial GPS receiver sample rates are 5 Hz. Platform 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 2007-03-02
Beginning_Time 19:49:00
Ending_Date 2007-03-03
Ending_Time 00:24:00
Currentness_Reference ground condition
Progress Complete
Maintenance_and_Update_Frequency During Low-Low Tide episodes.
West_Bounding_Coordinate -117.2630690000
East_Bounding_Coordinate -117.2510460000
North_Bounding_Coordinate 32.9412560000
South_Bounding_Coordinate 32.8723100000
Theme_Keyword_Thesaurus None
Theme_Keyword ATV
Place_Keyword_Thesaurus None
Place_Keyword NCEX-TORREY
Temporal_Keyword_Thesaurus None
Temporal_Keyword 2007, March
Access_Constraints None
Use_Constraints None
Logical_Consistency_Report Not Applicable
Completeness_Report /project/posncex/atv/20070302-alongshore/ This survey was completed in a single afternoon. Driver (POS Region): Ian Driver (NCEX Region): volunteer POS region spans T84-T111, NCEX region spans T34-T57 Low tide was at 2:44pm -0.8 The rivermouth was not passable due to recent heavy rains. 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. atvgeoidposncex.m was used to filter the data.
Process_Description Transfer raw GPS data from base station and ATV rover Ashtech GPS receivers for each of the surveys conducted to processing computer Transfer raw gyro (roll, pitch and yaw) data and kinematic GPS data for the ATV surveys conducted to same processing computer. Process raw ATV) GPS data with raw base station data with known base station coordinates with Waypoint Consulting's GrafNav software to generate post-processed
Process_Date March 3, 2007
Latitude_Resolution 0.00000000001
Longitude_Resolution 0.00000000001
Geographic_Coordinate_Units Decimal degrees
Horizontal_Datum_Name ITRF2000
Ellipsoid_Name WGS84
Semi_major_Axis 6378137.0000000000
Denominator_of_Flattening_Ratio 298.2572326660
Altitude_Datum_Name North American Vertical Datum of 1988
Altitude_Resolution 0.0099999998
Altitude_Distance_Units meters
Altitude_Encoding_Method Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Overview 4-column
Entity_and_Attribute_Detail_Citation Scripps Institution of Oceanography, 2007
Metadata_Date 2007-03-05
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
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