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Arc Files:
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Digital Data:
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Metadata:
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Notes
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CR199CA Misc. Notes:
There appears to be a slight problem with the horizontal control for this beach.
The observed coordinates generated by the Geodimeter following Program 20 are
slightly high compared to the spread of the surveyed Control Points.
I suggest we take a closer look at the GPS data to see if there was a problem.
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Overview
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Metropolitan Santa Cruz Beach Surveys
Corcoran Beach, Santa Cruz, CA
12 January 1999, 1130 to1230 (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,
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NAVD88 Elevation datum)
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Latitude
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+36.95911 (N 36deg 57m 32.793868s)
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Longitude
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-121.98359 (W 121deg 59m 00.919492s)
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Elevation
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9.423 m
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UTM Coordinates
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(Zone 10N, WGS84 Ellipsoid, NAD83 datum,
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NAVD88 Elevation datum)
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Northing
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4090818.847 m
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Easting
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590486.008 m
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Elevation
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9.423 m
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Surveying Conditions
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Skies
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mostly clear, low stratus on the horizon
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Temperature
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66.4 F
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Barometric Pressure
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30.06 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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2-3 ft. breaking waves
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Optical Siting
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good, no heat shimmer
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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:
Spectra Precision EXTB with point and 5/8 in. coupler (combined length: 0.343 m)
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Field Procedure
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The total station was set up on Control Point 11104 "Bench Mark".
The HA reference was set to 000 d relative to Control Point 11101
"North Bridge". 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", utilizing Control Point 11104 as the station
location and Control Point 11101 as the known reference object.
Program 4 (UTM) was used to collect control and topo points
Control Points: 11101 and 11103 were surveyed (Fast Standard mode)
The Profile was surveyed using the EXP3 stadia rod (Tracking mode) and carried
offshore into the surf zone. The profile was carried to the maximum limit of the stadia rod, offshore.
The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)
Control Point 11102 was surveyed with EXTB stadia in a hand-held fashion.
Gretchen Luepke sketched the beach and assisted with the control points.
Thomas E. Reiss took written notes and photographed the area.
Kristin M. Brown operated the total station
Justin Friesner was the rodman
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Field Observations
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The total station was set up on Control Point 11104 "Bench Mark". The HA
reference was set to 000 d relative to Control Point 11101 "North Bridge".
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", utilizing Control Point 11104 as the
station location and Control Point 11101 as the known reference object.
Program 4 (UTM) was used to collect control and topo points
Control Points: 11101 and 11103 were surveyed (Fast Standard mode)
The Profile was surveyed using the EXP3 stadia rod (Tracking mode) and carried
offshore into the surf zone. The profile was carried to the maximum limit of the stadia rod, offshore.
The Wet/Dry line was surveyed using the EXP3 stadia rod (Tracking mode)
Control Point 11102 was surveyed with EXTB stadia in a hand-held fashion.
Gretchen Luepke sketched the beach and assisted with the control points.
Thomas E. Reiss took written notes and photographed the area.
Kristin M. Brown operated the total station
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Post-processing
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Survey data was downloaded from the Total Station memory , automatically creating a RAW file and an associated JOB file.
The RAW file was used to generate a PTS file (UTM field 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 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, relative 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 (CORCORAN.XLS, sheet 990113B) to convert the relative XYZ data (Cartesian system) to UTM.
UTM values were extracted from CORCORAN.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
(990113B1.DOC AND 990113B2.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: < 0.014 m
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Vertical: < 0.011 m
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Observed Accuracy of Control Points: (field observations as compared to GPS derived positions)
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Northing: < 0.056 m
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Easting: < 0.018 m
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Elevation: < 0.014 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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990113B.RAW: Original data file from the Geodimeter (linear format of polar coordinate data)
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990113B.JOB: Geotools generated observation file (similar in format to the RAW file)
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990113B.PTS: Geotools extracted listing of field observed UTM coordinates (from RAW file)
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990113B.ED: PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
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990113B.PF: PFGD.EXE output file (from ED file)
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990113B.DAT: XYZ data, relative grid (Geodimeter as origin)
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990113B.UTM: Excel algorithm generated UTM coordinates
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990113B.JNB: SigmaPlot (v. 4.0) graphics file showing plan and profile views of UTM data
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990113B.DOC: This document file (MS WORD file)
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990113B.TXT: This document in ASCII format
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99011313.KDC to 99011324.KDC: digital images, Kodak format
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99011313.JPG to 99011324.JPG: digital images, JPEG format (see attached descriptions)
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990113B1.DOC, 990113B2.DOC: Digital image files (JPEG images with descriptions)
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IMAGE.TXT: Descriptions of digital images taken on this day
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990113_LOG.XLS, sheet 990113B: Excel sheet detailing survey operations
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CORCORAN.XLS, sheet 990113B: 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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99011313: View of Corcoran Beach, from the road, looking south-southwest.
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The location of Control Point SCRUZ.ARE/11104 "Bench Mark" can be seen in the upper left corner.
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99011314: Gretchen Luepke setting up a reflector on Control Point
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SCRUZ.ARE/11103 "On-line". This control point is a survey nail pounded into
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the asphalt shoulder of the road. The control point sits on the "profile" and is the starting point of the profile survey.
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99011315: View of Corcoran Beach, from Control Point SCRUZ.ARE/11104 "Bench
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Mark", looking northwest. Note the coloration difference between the dry
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backbeach sand and the wet foreshore sand. The contact is the Wet/Dry line that was surveyed.
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99011316: View of Corcoran Beach, at ground level, from the foreshore,
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looking southeast. The beach to the southeast is narrow and backed by rock rip-rap.
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99011317: View of Corcoran Beach foreshore, at ground level, looking
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northwest. A relatively flat foreshore and a non-distinct berm crest characterize this beach.
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99011318: View of Corcoran Beach foreshore, at ground level, looking northeast. A broad, flat backbeach with an ephemeral stream characterize this pocket beach.
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99011319: View of Corcoran Beach, from Control Point SCRUZ.ARE/11104
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"Bench Mark", looking northwest. Note the coloration difference between the
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wet foreshore sand and the dry backbeach sand. The contact is the Wet/Dry line that was surveyed.
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99011320: View of Corcoran Beach, taken from a point just southeast of
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Control Point SCRUZ.ARE/11104 "Bench Mark", looking northwest.
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99011321: View of Corcoran Beach, from Control Point SCRUZ.ARE/11104 "Bench
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Mark", looking southeast along the rock wall that protects the houses to the
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north. The beach is narrow along the rock wall. High-tide waves reach the rocks.
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99011322: Kristin M. Brown, UCSC graduate student operating the Geodimeter
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at this location. The Geodimeter is set up over Control Point
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SCRUZ.ARE/11104 "Bench Mark". This is the typical Geodimeter Location for this beach.
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99011323: Control Point SCRUZ.ARE/11104 "Bench Mark" The monument is a brass
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cap encased in concrete. The monument pre-dates our study and is a
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convenient point from which to survey this beach.
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99011324: View of the backbeach and ephemeral stream area of Corcoran Beach.
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In this view, the locations of three control points can be seen: Control
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Points SCRUZ.ARE/11101 AND 11102 are located near the bridge and SCRUZ.ARE/11103 is at center left, near the "No Parking" sign on the road.
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No analog holdings.
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