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USGS CMG C-W1-99-CA Geodetics

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Relative Reference Frame
Geodetic Points c-w1-99-ca.990112c.pts
Metropolitan Santa Cruz Beach Surveys
  Cowells Beach, Santa Cruz, CA   12 January 1999, 1315 to1415 (PST)
Synopsis   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.
Total Station Location
Geographic Coordinates (WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Latitude N 36d 57m 43.876132s
Longitude W 122d 01m 22.988390s
Elevation 5.342 m
UTM Coordinates (Zone 10N, WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Northing 4091123.607 m
Easting 586969.164 m
Elevation 5.342 m
Surveying Conditions
Skies clear
Temperature 62.1 F
Barometric Pressure 30.00 in HG
Wind < 5 kts out of the west
Precipitation none
Sea State 1 ft. breaking waves
Optical Siting good, no heat shimmer
Field Procedure   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
Field Observations  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
Post-processing   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)
Precision and Accuracy of Acquired Data
Program 20 (Station Establishment)
Northing: < 0.001 m
Easting: < 0.001 m
Combined: < 0.001 m
Elevation: < 0.001 m
Siting on Control Points: (distance dependent, based on spread of values)
Horizontal: < 0.002 m
Vertical: < 0.001 m
Observed Accuracy of Control Points: (field observations as compared to GPS derived)
Northing: < 0.007 m
Easting: < 0.017 m
Elevation: < 0.005 m
Siting on topo points: (distance dependent, extension dependent, hand-held stadia)
Horizontal: ~ 0.1 m
Vertical: ~ 0.02 m
Generated Files
990112C.RAW Original data file from the Geodimeter (linear format of polar coordinate data)
990112C.JOB Geotools generated observation file (similar in format to the RAW file)
990112C.PTS Geotools extracted listing of field observed UTM coordinates (from RAW file)
990112C.ED PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
990112C.PF PFGD.EXE output file (from ED file)
990112C.DAT XYZ data, relative grid (Geodimeter as origin)
990112C.UTM Excel algorithm generated UTM coordinates
990112C.JNB SigmaPlot (v. 4.0) graphics file showing plan and profile views of UTM data
990112C.DOC This document file (MS WORD file)
990112C.TXT This document in ASCII format
99011220.KDC to 99011226.KDC digital images, Kodak format
99011220.JPG to 99011226.JPG digital images, JPEG format (see attached descriptions)
990112C1.DOC Digital image files (JPEG images with descriptions)
IMAGE.TXT Descriptions of digital images taken on this day
990112_LOG.XLS, sheet 990112C Excel sheet detailing survey operations
COWELLS.XLS, sheet 990112C Excel sheet of relative coordinates to UTM data conversion
Images Taken
The following images were taken with a Kodak DC120 Digital camera.
99011220 Control Point SCRUZ.ARE/10704 "Stone Arch". The
Geodimeter is typically set up on this control point. View looking south-southeast.
99011221 Control Point SCRUZ.ARE/10701 "Wall" This is a close-up view of the survey nail.
99011222 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 betwthe two support columns.
99011223 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.)
99011224 View of Cowells Beach looking northwest. The location of Control Point SCRUZ.ARE/10701 "Wall" can be seen in this view.
99011225 View of Cowells Beach, looking east towards the Santa Cruz wharf.
99011226 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.
No analog holdings.

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