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Notes
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SK199CA Misc. Notes
There appears to be a problem with the vertical control at this beach. The
standard deviation of the field-derived coordinate system is too high. I
suggest we look at the GPS data again to determine if a mistake has been
made.
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Overview
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Metropolitan Santa Cruz Beach Surveys
Scott Creek Beach, Santa Cruz County, CA
11 January 1999, 0900 to1000 (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 was 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
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datum)
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Latitude
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+37.03990 (N 37deg 02' 23.643190")
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Longitude
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-122.22931 (W 122deg 13' 45.514361")
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Elevation
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5.600 m
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UTM Coordinates
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(Zone 10N, WGS84 Ellipsoid, NAD83 datum, NAVD88
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Elevation datum)
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Northing
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4099576.395 m
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Easting
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568537.730 m
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Elevation
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5.600 m
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Surveying Conditions
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Skies
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partly cloudy, low overcast
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Temperature
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58.6 deg F
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Barometric Pressure
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30.00 in HG
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Wind
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< 5kts out of the west
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Precipitation
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none
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Sea State
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4-5' breaking waves
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Optical Siting
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good, no heat shimmer, a hazy (saltation) condition
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on distant wet/dry shots
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Geodetics Equipment
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Geodimeter 640 Total Station
Autolock and Robotic capabilities
Internal memory only
SCRUZ.ARE file resident in memory
Instrument Height meter
Wild tripod (wood)
12-volt gel cell battery
Stadia rods:
SECO RWLR-4, w/EXTR (combined height: 1.572 m)
SECO BWLR-4, w/EXTB (combined height: 1.573 m)
Mound City EXP3, w/hydro (combined heights: 1.701 m, 3.096 m, and 4.545 m)
Seco Level Rod support tripods (two)
Kodak DC120 Digital Camera
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Field Procedure
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Two highway signs delineate the profile at Scott Creek. The total station
was set up just south of the profile. 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 "Unknown Station Location"
Control Points: 10101, 10104, 10102, and 10103 were surveyed (Fast
Standard mode)
Profile was surveyed using the EXP3 stadia rod (Tracking mode)
The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)
Gretchen Luepke sketched the beach.
Thomas E. Reiss photographed the area.
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Field Observations
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Scott Creek continues to flow into the ocean to the north. Beach cusps
evident. Surf conditions too rough to go very far offshore.
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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).
Raw file is used to generate a PTS file (UTM coordinates are extracted
from the original file) Note: no recalculation is performed on the
original file)
PFCODE.EXE is used to generate an ED file
The ED file is edited to include necessary Program 10 information, Points
block listing, and necessary INFO codes. Field procedures are checked and
corrected if necessary
PFGD.EXE is used to generate a Cartesian-based, XYZ file (PF) from the ED file
Extraneous lines are removed from the PF file to generate a DAT file
(relative XYZ coordinates)
Data values from the DAT file were put into GRIDCON.XLS (SCOTT.XLS, sheet
990111A) to convert the relative XYZ Cartesian system to UTM.
UTM values were compared to field observations (PTS file) to check for
discrepancies.
UTM data is plotted in plan and profile views using SigmaPlot (v. 4.0)
Digital images were inserted into a MS WORD document and 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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Standard Deviation (Northing)
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0.026 m
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Standard Deviation (Easting)
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0.022 m
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Standard Deviation (Combined)
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0.034 m
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Standard Deviation (Elevation)
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0.146 m
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Siting on Control Points
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(distance dependent, based on spread of
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values)
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Horizontal
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< 0.003 m
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Vertical
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< 0.004 m
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Siting on topo points
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(distance dependent, extension dependent,
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hand-held stadia)
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Horizontal
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~ 0.1 m
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Vertical
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~ 0.02 m
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Generated Files
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990111A.RAW
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Original data file from the Geodimeter
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(linear format of polar coordinate data)
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990111A.JOB
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Geotools generated observation file
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(similar in format to the RAW file)
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990111A.PTS
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Geotools extracted listing of field
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observed UTM coordinates (from RAW file)
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990111A.ED
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PFCODE.EXE generated file (tabular format
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of polar coordinate data, from JOB file)
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990111A.PF
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PFGD.EXE output file (from ED file)
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990111A.DAT
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XYZ data, relative grid (Geodimeter as
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origin)
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990111A.UTM
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Excel algorithm generated UTM coordinates
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990111A.JNB
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SigmaPlot (v. 4.0) graphics file showing
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plan and profile views of UTM data
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990111A.DOC
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This document file (MS WORD file)
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990111A.TXT
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This document in ASCII format
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99011101.KDC to 99011105.KDC
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digital images, Kodak format
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99011101.JPG to 99011105.JPG
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digital images, JPEG format (see attached
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descriptions)
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990111A1.DOC
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Digital image file
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IMAGE.TXT
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Descriptions of digital images taken on
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this day
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990111_LOG.XLS, sheet 990111A
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Excel sheet detailing survey operations
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SCOTT.XLS, sheet 990111A
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Excel sheet of relative to UTM data
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conversion
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Images Taken
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The following images were taken with a Kodak DC120 Digital
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camera.
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99011101
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Gretchen Luepke standing near the Geodimeter 640. View
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looking east. The Profile is determined by the line-up of the
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two highway signs shown in the background
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99011102
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View from the berm crest, online, looking north.
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99011103
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View from the berm crest, on line, looking south.
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99011104
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View looking north along Highway 1. The profile extends from
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the two highway signs on either side of the Highway. Two control
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points are situated "on-line" near each sign.
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99011105
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View from the highway, looking north. Scott Creek is shown
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in the background. The profile extends along the south end of the
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bridge, seaward.
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