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USGS CMG B-R1-99-CA Geodetics

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Digital Data:
Relative Reference Frame
Geodetic Points b-r1-99-ca.990111b.pts
 BR199CA  Misc. Notes: 
 There appears to be a slight problem with the vertical control at 
 this beach. The standard deviation of the field-derived coordinate 
 system is high. I suggest we look at the GPS data again to determine 
 if a mistake has been made.
Metropolitan Santa Cruz Beach Surveys
    Natural Bridges State Beach, Santa Cruz, CA     11 January 1999, 1120 to 1205 (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 was 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 56m 59.560933s
Longitude W 122d 03m 23.351717s
Elevation 12.813 m
UTM Coordinates (Zone 10N, WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Northing 4089728.005 m
Easting 584006.247 m
Elevation 12.813 m
Surveying Conditions
Skies mostly clear with low stratus on the horizon
Temperature 60.0 F
Barometric Pressure 29.91 in HG
Wind ~10 kts out of the west
Precipitation none
Sea State 3-4 ft. breaking waves
Optical Siting good, no heat shimmer
Geodetics Equipment
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
Field Procedure  The total station was set up near the upper parking lot of the Park, near the entrance hut.    The SECO level rods, in conjunction with the level-rod support tripods were placed on the   control points and pointed towards the total station. As the Control Points were shot,   the tripods and level rods were moved.    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"
 Program 4 (UTM) was used for data collection    Control Points: 10403, 10405, 10402, 10404, and 10401 were surveyed (Fast Standard mode)  The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)  The established Profile was surveyed using the EXP3 stadia rod (Tracking mode). The swimmer carried   the profile offshore to a point where he was obscured by the southern headland.
 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  There was a well-defined wet/dry line. Beach cusps were of low  amplitude. The stream that cuts across the northern edge of the  beach was not breaking through to the ocean.
Post-processing  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 (BRIDGES.XLS, sheet 990111B) 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)
Precision and Accuracy of Acquired Data
Program 20 (Station Establishment)
Standard Deviation (Northing): 0.028 m
Standard Deviation (Easting): 0.022 m
Standard Deviation (Combined): 0.017 m
Standard Deviation (Elevation): 0.045 m
Siting on Control Points: (distance dependent, based on spread of values)
Horizontal: < 0.008 m
Vertical: < 0.005 m
Siting on topo points: (distance dependent, extension dependent, hand-held stadia)
Horizontal: ~ 0.2 m
Vertical: ~ 0.05 m
Generated Files
0111B.RAW: Original data file from the Geodimeter (linear format of polar coordinate data)
0111B.JOB: Geotools generated observation file (similar in format to the RAW file)
0111B.PTS: Geotools extracted listing of field observed UTM coordinates (from RAW file)
0111B.ED: PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
0111B.PF: PFGD.EXE output file (from ED file)
0111B.DAT: XYZ data, relative grid (Geodimeter as origin)
0111B.UTM: Excel algorithm generated UTM coordinates
0111B.JNB: SigmaPlot (v. 4.0) graphics file showing plan and profile views of UTM data
0111B.DOC: This document file (MS WORD file)
0111B.TXT: This document in ASCII format
011106.KDC to 99011109.KDC: digital images, Kodak format
011106.JPG to 99011109.JPG: digital images, JPEG format (see attached descriptions)
0111B1.DOC: Digital image file, with descriptions
AGE.TXT: Descriptions of digital images taken on this day
0111_LOG.XLS, sheet 990111B: Excel sheet detailing survey operations
IDGES.XLS, sheet 990111B: Excel sheet of relative to UTM data conversion
Images Taken
The following images were taken with a Kodak DC120 Digital camera.
99011106: View from the upper parking lot, looking west-southwest. Control point "Point" sits on the rock ledge leading to the arch
Companion image to 99011107, 99011108, and 99011109.
99011107: View from the upper parking lot, looking west. Control point "Platform" sits on the rock outcrop in image upper-middle.
Companion image to 99011106, 99011108, and 99011109.
99011108: View from the upper parking lot, looking northwest. Control point "Path" sits on the path leading down from the Visitor's Center (near blue lifeguard Stand). Companion image to 99011106, 99011107, and 99011109.
99011109: View from the upper parking lot, looking north. Control point "Bench Mark" is located in ice plant in image upper-middle. Companion image to 99011106, 99011107, and 99011108.
990111BP: Composite-panoramic image
No analog holdings.

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