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Digital Data:
Relative Reference Frame d-l1-97-ca.970910b.pf
Metadata:
Notes
 DL197CA  Notes:
 This was Ms Horsman's first attempt at running a total station survey. Her field notes indicate some 
 discrepancies with the heights of the total station and stadias used.
 1) Field-notes would suggest that 51.0cm must be subtracted from all observed Instrument 
 Height readings. This would result in instrument heights that would be unreasonably low (<1m). 
 THE ASSUMPTION THAT THE ORIGINAL UNCORRECTED INSTRUMENT HEIGHTS ARE INDEED CORRECT IS BEING MADE. 
 Since differences between the actual and recorded heights of the total station will only result in a 
 bad beach elevation at the total station, the validity of this assumption can be checked by looking at the 
 total station spot elevation when the instrument was set up "on-line". The elevations along the profile 
 should show a reasonable trend. The reason for the noted correction is uncertain. 
 2)Hand-written notes from the field would suggest that two different stadias were used in the 
 field. This reference only appears once, at New Brighton State Beach where Ms Horsman refers to 
 "1st 33 pts with single prism". This may refer to the stadia with a single prism holder 
 (typically used for water-work). She goes on to write: "next pts done with hydro prism" which I 
 take to be the stadia with the multi-prism holder (as referenced in the notes from Seacliff State Beach 
 where she writes: "used hydro prism but not sure of orientation of prism on rod (height may differ)". 
 Only the multi prism holder can be mounted on the stadia in an inverted orientation. For post-processing purposes, 
 THE ASSUMPTION THAT ONLY THE MULTI-PRISM HOLDER ON REF1 STADIA ROD WAS USED FOR ALL SURVEYS IS BEING MADE. 
 This may result in vertical errors amounting to 0.064m if there was in fact a second stadia used.
 3) Ms. Horsman used a value of 0.771m as the shortest stadia length, recorded both in field 
 notes and the instrument's internal memory. The actual length is 1.769m for the REF1 stadia with an 
 inverted multi-prism holder. THE ASSUMPTION THAT THE "1" WAS INADVERTENTLY REPLACED BY A "0" IS BEING MADE. 
 4) Ms. Horsman makes reference to reducing some stadia lengths by 0.150m. (25.8cm-10.8cm, "length of 1st 
 prism - length of hydro prism" - New Brighton State Beach notes). No reasonable explanation can be found for doing so. 
 THE ASSUMPTION THAT ADDITIONAL CHANGES TO THE STADIA HEIGHTS IS UNNECESSARY IS BEING MADE.
 5) Only one of the control points surveyed in the field corresponds to the control points 
 surveyed using GPS. Accordingly, the UTM conversion had to take place at a later time when both GPS control 
 points were surveyed simultaneously.
      
Overview
Monterey Bay Beach Monitoring Project
    Del Monte Beach, Monterey Bay / Monterey County, CA     10 September 1997, 10:29 - 11:18 PDT (local)
Synopsis   A beach and nearshore topographic survey consisting of one centerline   profile and four shore-normal auxiliary lines was conducted.   The centerline profile was extended offshore into the surf zone   utilizing a swimming rodman. This survey is the latest in a series of repetitive, profile surveys at this location, dating back to 1982.
Total Station Location
Geographic Coordinates (WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Latitude N ?d ?m ?s
Longitude W ?d ?m ?s
Elevation ? m
UTM Coordinates (Zone ??N, WGS84 Ellipsoid, NAD83 datum, NAVD88 Elevation datum)
Northing ? m
Easting ? m
Elevation ? m
Surveying Conditions
Skies Clear
Temperature 70-72 F
Barometric Pressure ? in HG
Wind < 5knt out of the east
Precipitation none
Sea State 5-6ft breaking waves
Optical Siting ?
Geodetics Equipment
Geodimeter 640 Total Station

Autolock and Robotic capabilities

Internal memory only

Instrument Height meter

Wild tripod (wood)

12-volt gel cell battery

Stadia rods:

Mound City Round, expandable, fiberglass, stadia rods (REF0 and REF1):
w/single prism holder and sealed prism (combined heights: 1.705m, 3.099m, and 4.549m)
w/multiple prism holder and sealed prism, inverted configuration (combined heights: 1.769m, 3.164m, and 4.613m)

Nikonos Underwater 35mm Camera
Field Procedure   The total station was set up off the centerline profile. The HA reference was not set to 000d relative to any known control point.   Program 10 (Location Information) was not performed on the total station.   Program 2 was used to collect control and topo points.   Control Points: Three control points were surveyed in "Standard mode".   The Profile was surveyed using the REF1 stadia rod, in "Tracking mode", and carried offshore into the surf zone. The profile was carried to the maximum limit of the stadia rod, offshore.   Sand Sample: One sand sample was obtained (ID # 970910-2), on the beach foreshore.   Four auxiliary lines were surveyed using the REF1 stadia rod in "Tracking mode".   Jennifer Horsman sketched the beach and operated the total station.   John R. Dingler was the rodman for the topographic points.
Field Observations   This is a transitional type of beach; somewhat protected by Monterey to the west and oriented   approximately parallel to the predominant wave direction (westerly). During severe northwesterly waves,   this beach can experience large (>6ft) plunging, breaking waves.
Post-processing   Survey data was downloaded from the Total Station memory , automatically creating a RAW file and an associated JOB 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 (??.XLS, sheet ??) to convert the relative XYZ data (Cartesian system) to UTM.   UTM data was plotted in plan and profile views using SigmaPlot (v. 5.0).
Precision and Accuracy of Acquired Data
Standard Deviation (Northing) 0.028 m
Observed Precision of Control Points (distance dependent, based on spread of values)
Horizontal < ? m
Vertical < ? m
Observed Accuracy of Control Points (field observations as compared to GPS derived positions)
Horizontal < ? m
Elevation < ? m
Siting on topo points (distance dependent, extension dependent, hand-held stadia)
Horizontal ~ 0.1 m
Vertical ~ 0.02 m
Generated Files
970910B.RAW Original data file from the Geodimeter (linear format of polar coordinate data)
970910B.JOB Geotools generated observation file (similar in format to the RAW file)
970910B.ED: PFCODE.EXE generated file (tabular format of polar coordinate data, from JOB file)
970910B.PF PFGD.EXE output file (from ED file)
970910B.DAT XYZ data, relative grid (Geodimeter as origin)
970910B.UTM Excel algorithm generated UTM coordinates
970910B.JNB SigmaPlot (v. 5.0) graphics file showing plan and profile views of UTM data
970910B.DOC This document file (MS WORD file)
970910B.TXT This document in ASCII format
970910B.XLS Excel sheet detailing survey operations
No analog holdings.

         
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