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Arc Files:
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Digital Data:
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Metadata:
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Overview
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Metropolitan Santa Cruz Beach Surveys
Cowells Beach, Santa Cruz, CA
12 January 1999, 1315 to1415 (PST)
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Synopsis
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A beach and nearshore topographic survey consisting of one shore-normal
profile and one shore-parallel line (wet/dry line) was conducted. The
profile were extended offshore into the surf zone utilizing a swimming rodman.
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Total Station Location
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Geographic Coordinates
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(WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
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Latitude
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N 36d 57m 43.876132s
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Longitude
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W 122d 01m 22.988390s
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Elevation
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5.342 m
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UTM Coordinates
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(Zone 10N, WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
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Northing
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4091123.607 m
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Easting
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586969.164 m
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Elevation
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5.342 m
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Surveying Conditions
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Skies
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clear
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Temperature
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62.1 F
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Barometric Pressure
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30.00 in HG
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Wind
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< 5 kts out of the west
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Precipitation
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none
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Sea State
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1 ft. breaking waves
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Optical Siting
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good, no heat shimmer
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Field Procedure
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The total station was set up on Control Point 10704 "Stone Arch".
The HA reference was set to 000d relative to Control Point 10705
"Wharf". The SECO level rods, in conjunction with the level-rod support
tripods were placed on the control points and pointed towards the total station.
Program 10 (site setup) was performed on the total station
Program 20 (station establishment) was performed on the total station
using option "Known Station Location". Control Point 10705 "Wharf" was used as the known reference object.
Program 4 (UTM) was used to collect control and topo points
Control Points: 10705, 10703, and 10701 were surveyed (Fast Standard
mode). Support tripods were used on 10705 and 10703, a hand-held stadia was used on 10701.
The Profile was surveyed using the EXP3 stadia rod (Tracking mode) and
carried offshore into the surf zone. Due to the gently sloping bottom
topography, the profile was not carried to the maximum limit of the stadia rod, offshore.
The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)
Gretchen Luepke sketched the beach and assisted with the control points.
Thomas E. Reiss operated the total station and photographed the area.
Justin Friesner was the rodman
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Field Observations
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Control Point 10702 "Path" is no longer observable. It was washed away
in a past El Nino storm. Control Point 10701 "Wall" was difficult to
shoot because the control point is a survey nail pounded into the
vertical face of the cliff. Accordingly, holding a stadia rod vertically
stable on the point is very difficult. Because of this, the spread
values were not used to describe the precision and accuracy of the
generated topo coordinates. Low amplitude beach cusps were observed near
the center of the embayment. Mounded sand near the wharf looked
"confused", as though its morphology was due to a combination of storm
waves, wind, and stream-cut scarp. This looks like a relatively low energy
beach
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Post-processing
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Survey data was downloaded from the Total Station memory (JOB file is automatically is created from the RAW file).
The RAW file was used to generate a PTS file (UTM coordinates are extracted from the RAW file) Note: no recalculation is performed on the original file)
PFCODE.EXE was used on the JOB file to generate an ED file
The ED file was edited to include necessary Program 10 information, Points block listing, and necessary INFO codes. Field procedures were checked and corrected as necessary.
PFGD.EXE was used on the ED file to generate a PF file (Cartesian-based, XYZ coordinates)
Extraneous lines were removed from the PF file to generate a DAT file (relative XYZ coordinates)
Data values from the DAT file were put into GRIDCON.XLS (COWELLS.XLS, sheet 990112C) to convert the relative XYZ data (Cartesian system) to UTM.
UTM values were extracted from COWELLS.XLS (UTM file) and compared to field observations (PTS file) to check for discrepancies.
UTM data was plotted in plan and profile views using SigmaPlot (v. 4.0)
Digital images were inserted into a MS WORD document (990112C1.DOC) and summarily described (IMAGE.TXT file)
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Precision and Accuracy of Acquired Data
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Program 20 (Station Establishment)
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Northing: < 0.001 m
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Easting: < 0.001 m
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Combined: < 0.001 m
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Elevation: < 0.001 m
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Siting on Control Points: (distance dependent, based on spread of values)
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Horizontal: < 0.002 m
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Vertical: < 0.001 m
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Observed Accuracy of Control Points: (field observations as compared to GPS derived)
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Northing: < 0.007 m
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Easting: < 0.017 m
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Elevation: < 0.005 m
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Siting on topo points: (distance dependent, extension dependent, hand-held stadia)
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Horizontal: ~ 0.1 m
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Vertical: ~ 0.02 m
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Generated Files
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990112C.RAW
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Original data file from the Geodimeter (linear format of polar coordinate data)
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990112C.JOB
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Geotools generated observation file (similar in format to the RAW file)
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990112C.PTS
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Geotools extracted listing of field observed UTM coordinates (from RAW file)
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990112C.ED
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PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
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990112C.PF
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PFGD.EXE output file (from ED file)
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990112C.DAT
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XYZ data, relative grid (Geodimeter as origin)
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990112C.UTM
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Excel algorithm generated UTM coordinates
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990112C.JNB
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SigmaPlot (v. 4.0) graphics file showing plan and profile views of UTM data
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990112C.DOC
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This document file (MS WORD file)
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990112C.TXT
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This document in ASCII format
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99011220.KDC to 99011226.KDC
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digital images, Kodak format
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99011220.JPG to 99011226.JPG
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digital images, JPEG format (see attached descriptions)
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990112C1.DOC
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Digital image files (JPEG images with descriptions)
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IMAGE.TXT
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Descriptions of digital images taken on this day
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990112_LOG.XLS, sheet 990112C
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Excel sheet detailing survey operations
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COWELLS.XLS, sheet 990112C
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Excel sheet of relative coordinates to UTM data conversion
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Images Taken
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The following images were taken with a Kodak DC120 Digital camera.
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99011220
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Control Point SCRUZ.ARE/10704 "Stone Arch". The
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Geodimeter is typically set up on this control point. View looking south-southeast.
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99011221
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Control Point SCRUZ.ARE/10701 "Wall" This is a close-up view of the survey nail.
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99011222
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Control Point SCRUZ.ARE/10701 "Wall" This control point is a survey nail pounded directly into the vertical wall under the pool deck. Its approximate location in the image is just below the rust colored band and centrally positioned betw the two support columns.
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99011223
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View of Cowells Beach, looking west in to sun. As a result, the left side of the image is over-exposed. Some detail can be seen at image right. (Image not included in hardcopy.)
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99011224
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View of Cowells Beach looking northwest. The location of Control Point SCRUZ.ARE/10701 "Wall" can be seen in this view.
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99011225
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View of Cowells Beach, looking east towards the Santa Cruz wharf.
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99011226
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Control Point SCRUZ.ARE/10703 "Bathrooms" This control point is positioned approx. 20 cm from the corner of the concrete, on the path leading to the restrooms. The asphalt path leading to the beach can be seen in the background.
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No analog holdings.
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