SCBPS Survey Archive

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id 851

Submit_Time 2015-01-14 22:09:25

SurveyID 648

Originator Scripps Institution of Oceanography

Publication_Date 2014-12-10

Title December 2014 Sand Level Measurements in Nearshore Southern California.

Abstract This data set contains 5-column ASCII survey point data from a strip of San Diego County Coastline extending from the Tijuana River mouth northward approximately 3.8km to the second breakwater north of the Imperial Beach pier. Low tide data was collected with the ATV sampled at 5 Hz.

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 Terrestrial (ATV) systems utilizing Ashtech Global Positioning System (GPS) receivers (Z-Extreme) provide platform positioning. The GPS receivers record pseudo-range and phase information at 5Hz for post-processing. 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. The data files are comprised of five columns: Lat, Lon, Z(rel. to MSL), DateTime(UTC), Substrate type. The Substrate type is defined by a numeric code: 0 = No data, 1 = Sand, 2 = Cobbles, 3 = Bedrock. The substrate type was identified by the ATV driver at the time of the survey.

Beginning_Date 2014-12-05

Beginning_Time 19:23:41

Ending_Date 2014-12-05

Ending_Time 23:34:43

Currentness_Reference ground condition

Progress Complete

Maintenance_and_Update_Frequency During Low-Low Tide episodes.

West_Bounding_Coordinate -117.1339410000

East_Bounding_Coordinate -117.1277820000

North_Bounding_Coordinate 32.5910970000

South_Bounding_Coordinate 32.5543340000

Theme_Keyword_Thesaurus None

Theme_Keyword ATV

Place_Keyword_Thesaurus None


Temporal_Keyword_Thesaurus None

Temporal_Keyword 20141205, December 2014

Access_Constraints None

Use_Constraints None

Logical_Consistency_Report Not Applicable

Completeness_Report ; DATE: Dec. 8/14 (date/time of processing) ; TIME: 8:42:18 ; CREATED BY: GrafNav Version 8.10.2428 MB_MASTER_FILE = C:surveydataatv20141205BBASEA14.gpb MB_MASTER_POS = 32 34 43.64475 -117 07 57.18054 -28.3240 MB_MASTER_ANT = 0.056 0.006 0.000 0 ASH701975.01A 0 REMOTE_FILE = C:surveydataatv20141205BROVRA14.gpb REMOTE_POS = 32 34 43.56349 -117 07 57.17191 -16.2286 REMOTE_ANT = 0.056 0.006 0.000 0 ASH701975.01A 0 DATUM = NAD83_CORS96 AUTO ; Processing Datum ELEV_MASK = 10.0 ; Elevation mask (deg) GRID = UTM 1 0 ; Grid info Location = Imperial Beach Post Processed GPS File = C:surveydataatv2014120520141205.txt Kinematic GPS File = C:surveydataatv20141205G20141205.dat Gyro File = C:surveydataatv20141205A20141205.dat Substrate File = C:surveydataatv20141205S20141205.dat Antenna Height = 1.720000 flag_ppv = 1.000000 UTC vs GPS time offset (seconds) = -16.000000 Mean Offsets from Control Point: X = -3.2cm, Y= 15.3cm, Z = -1.7cm Time of first Sample at Control Point (UTC Hours): 19.261111 Time of last Sample at Control Point (UTC Hours): 23.661104 Number of Samples at Control Point: 3829 Imperial Beach (south section), Transects 1-42 \BeachIB09OLD_organizationIBpier_bathyatv20141205-alongshore This survey was done in a single afternoon. Wave conditions were small. Drivers: Upper beach - Rob Lower beach - Brian Tide: -0.9 ft low at 2:40pm NOTES: Green ATV was used for this survey. Data were processed by Brian without gyro using atvgeoidall_nogyro.m. There were some substrate switch and RTK issues, but both were resolved. QCd by Rob. Tablet used was Toughpad #1.

Process_Description Transfer raw GPS data from both base station and rover Ashtech GPS receivers to processing computer. Waypoint Consulting's Grafnav program processes the dual frequency GPS data for a NAD83 solution. Matlab programs then adjust the position and elevation by using the gyro data.

Process_Date 2014-12-08

Latitude_Resolution 0.00000000001

Longitude_Resolution 0.00000000001

Geographic_Coordinate_Units Decimal degrees

Horizontal_Datum_Name North American Datum of 1983 (CORS96)

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 5-column

Entity_and_Attribute_Detail_Citation Scripps Institution of Oceanography, 2014

Metadata_Date 2014-12-10

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