|
Arc Files:
|
|
|
Digital Data:
|
|
|
Metadata:
|
|
Notes
|
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.
|
|
Overview
|
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.
|
|
|
|
