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USGS CMG I-T1-99-CA Geodetics

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Arc Files:
Digital Data:
Relative Reference Frame
Geodetic Points i-t1-99-ca.990111c.pts
 IT199CA  Misc. Notes: 
   Control Point 10504 appears to be missing. I suggest we use the Geodimeter 640 to "point" towards the point to see if in fact it is a victim of bluff erosion.
Metropolitan Santa Cruz Beach Surveys
  Its Beach, Santa Cruz, CA   11 January 1999, 1245 to1400 (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 57m 07.447411s
Longitude: W 122d 01m 44.364355s
Elevation: 12.152 m
UTM Coordinates: (Zone 10N, WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Northing: 4089995.623 m
Easting: 586452.001 m
Elevation: 12.152 m
Surveying Conditions
Skies: mostly clear, low stratus on the horizon
Temperature: 69.1 F
Barometric Pressure: 29.88 in HG
Wind: ~ 10 kts out of the west
Precipitation: none
Sea State: 4' breaking waves
Optical Siting: good, no heat shimmer, a hazy (saltation) condition on distant wet/dry shots
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:
Spectra Precision EXTR (w/ point and 5/8" coupler: 0.347 m)
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 on the west side of the bluff overlooking Its Beach, between the guardrail and the edge of the cliff. 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", utilizing Control Points 10501, 10503, and 10505.   Program 4 (UTM) was used to collect control and topo points   Control Points: 10505, 10501, and 10503 10502 were surveyed (Fast Standard mode)   The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)   The Profile was surveyed using the EXP3 stadia rod (Tracking mode) and carried offshore into the surf zone. Due to large waves and dangerous currents, the profile was not carried to the maximum limit of the stadia rod, offshore.   Control Point 10502 was surveyed with the short EXTR stadia, in a hand-held manner (Fast Standard mode)   Gretchen Luepke sketched the beach.   Thomas E. Reiss operated the total station and photographed the area.   Justin Friesner was the rodman
Field Observations   High tide waves appear to reach all the way to the cliff. The wet/dry line  was limited to just the highest portions of the beach near the cliff. Control Point 10504 "Platform" appears to be missing.
Post-processing   Survey data was downloaded from the Total Station memory (JOB file is automatically is created).   Raw file was 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 was used 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 if necessary   PFGD.EXE was used to generate a Cartesian-based, XYZ file (PF) from the ED file   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 (ITS.XLS, sheet 990111C) to convert the relative XYZ Cartesian system to UTM.   UTM values were extracted from ITS.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 and described (IMAGE.TXT file)
Precision and Accuracy of Acquired Data
Program 20 (Station Establishment)
Standard Deviation (Northing): 0.010 m
Standard Deviation (Easting): 0.007 m
Standard Deviation (Combined): 0.007 m
Standard Deviation (Elevation): 0.001 m
Siting on Control Points: (distance dependent, based on spread of values)
Horizontal: < 0.003 m
Vertical: < 0.004 m
Siting on topo points: (distance dependent, extension dependent, hand-held stadia)
Horizontal: ~ 0.1 m
Vertical: ~ 0.02 m
Generated Files
990111C.RAW: Original data file from the Geodimeter (linear format of polar coordinate data)
990111C.JOB: Geotools generated observation file (similar in format to the RAW file)
990111C.PTS: Geotools extracted listing of field observed UTM coordinates (from RAW file)
990111C.ED: PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
990111C.PF: PFGD.EXE output file (from ED file)
990111C.DAT: XYZ data, relative grid (Geodimeter as origin)
990111C.UTM: Excel algorithm generated UTM coordinates
990111C.JNB: SigmaPlot (v. 4.0) graphics file showing plan and profile views of UTM data
990111C.DOC: This document file (MS WORD file)
990111C.TXT: This document in ASCII format
99011110.KDC to 99011112.KDC: digital images, Kodak format
99011110.JPG to 99011112.JPG: digital images, JPEG format (see attached descriptions)
990111C1.DOC: Digital image file
IMAGE.TXT: Descriptions of digital images taken on this day
990111_LOG.XLS, sheet 990111C: Excel sheet detailing survey operations
ITS.XLS, sheet 990111C: Excel sheet of relative coordinates to UTM data conversion
Images Taken
The following images were taken with a Kodak DC120 Digital camera.
99011110: View of Its Beach from atop the cliff point separating the two sandy beaches that make up Its Beach. View looking east. Note the stairs leading down to the beach.
A control point was placed on the stairs near the bottom.
99011111: View of Its Beach from atop the bluff overlooking the beach, looking east-southeast. A control point was placed in the wave-cut platform
observable in the image (left-top) but has subsequently been removed by cliff erosion. Also note the Lighthouse in the background. Earlier total station surveys used the top lightning rod as the HA azimuth reference angle.
99011112: View of the Geodimeter location. The instrument was set up on the bluff
erlooking the beach. Note the location of the Life-Ring at the top of the stairs. A control point
ts directly below the Life Ring. An additional control point was placed on the walking path on the opposite side of the stairs.
No analog holdings.

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