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Amhh GENERAL SURVEY NOTES BASIS OF BEARINGS AND COORDINATE SYSTEM: A SEPARATE ADJUSTMENT OF THE PRIMARY NETWORK WAS REFERENCED TO THE 1998.50 EPOCH RECORD O SURVEY • HORIZONTAL POSITIONS AND ELLIPSOID HEIGHTS ARE REFERENCED TO THE NORTH AMERICAN ADJUSTMENT OF THE HIGH PRECISION GEODETIC NETWORK (HPGN). STATIONS IN THE NSRS USED DATUM OF 1983 (NAD 83) 1991.35 EPOCH ADJUSTMENT OF THE HIGH PRECISION GEODETIC TO REFERENCE THIS SURVEY TO NAD 83, 1998.50 FOLLOW: #1045 = HPGN "W1413" LOCATED NETWORK (HPGN) CONVERTED TO THE CALIFORNIA COORDINATE SYSTEM OF 1983, ZONE 3 14 KILOMETERS NORTH OF CITY CENTER AND CNDR = "CONDOR", A CONTINUOUSLY OPERATED OF THE CITY OF STOCKTON HORIZONTAL CONTROL SYSTEM PHASE XIV (CCS83, ZONE 3) BASED ON THE 1994 COSCN AS SHOWN IN BOOK 33 OF SURVEYS AT PAGE REFERENCE STATION (CORS) LOCATED 7 KILOMETERS SOUTH OF CITY CENTER. THE POSITION OF WITHIN THE CITY OF STOCKTON AND COUNTY OF SAN JOAQUIN, SEE SURVEY REPORT ON FILE WITH THE CITY). ALSO CNDR IS PUBLISHED ON THE 1997.0 EPOCH AND WAS MOVED TO THE 1998.5 EPOCH BY STATE OF CALIFORNIA 20, SAN JOAQUIN COUNTY RECORDS ( ) APPLYING PUBLISHED VELOCITIES TO THE X, Y, Z CARTESIAN COORDINATES. INCLUDED AS A BASIS FOR A 1998.50 EPOCH ADJUSTMENT IS THE NATIONAL GEODETIC SURVEY (NGS) HPGN STATION "W1413" = #1045 IN THIS SURVEY, AND "CNDR", A CONTINUOUSLY PREPARED BY: OPERATING REFERENCE STATION (CORS) KNOWN AS CONDOR. (SEE REPORT) FIELD SURVEYS: OBSERVATIONS WERE TAKEN ON NOVEMBER 28-30 AND DECEMBER 3-12, M c G E E SURVEYING C O N S U LT I N G 2000 BETWEEN 0700-1700 PDST (+8 HRS FOR UCT). INCLUDED IN THE SURVEY FOR SANTA BARBARA, CALIFORNIA DATUM RELATIONSHIPS: GPS COORDINATES ARE THREE DIMENSIONAL CARTESIAN PROJECT CONTROL WERE THE 57 OF THE 1994 COSCN POINTS. & COORDINATES WITH THE ORIGIN 0,0,0 BEING EARTH-CENTERED AND EARTH-FIXED. THESE COORDINATES ARE CONVERTED FOR DISPLAY PURPOSES TO GEODETIC COORDINATES OF THE PRIMARY NETWORK (PN) WAS HELD TO A HIGHER STANDARD WITH THE INTENT OF KJELDSEN, SINNOCK & NEUDECK, INC. LATITUDE, LONGITUDE AND ELLIPSOID HEIGHTS. THE STATE PLANE ZONE THREE MAPPING OBTAINING RELATIVE ELLIPSOID HEIGHT ACCURACIES OF LESS THAN 3 CENTIMETERS. PN CONSULTING ENGINEERS & LAND SURVEYORS PROJECTION WAS APPLIED TO THE GEODETIC COORDINATES DERIVED FROM THE CARTESIAN POINTS WERE OCCUPIED 3-4 TIMES FOR 20+ MINUTES ON AVERAGE WHERE THE GENERAL COORDINATES TO OBTAIN GRID COORDINATES. NETWORK WAS OCCUPIED TWICE FOR 12+ MINUTES ON AVERAGE. THE PRIMARY NETWORK OF STOCKTON, CALIFORNIA 14 POINTS WAS OCCUPIED WHEN THE IONOSPHERE WAS FAIRLY INACTIVE AS INDICATED BY MARCH 2001 THE FOLLOWING STATIONS ARE PUBLISHED BY THE NGS ON VARIOUS EPOCHS. THESE THE PLANETARY K FACTOR. A BASE RECEIVER WAS SET ON #160 WHILE THREE ROVING STATIONS ARE PUBLISHED IN THIS SURVEY BASED ON THE 1994 COSCN: POINTS 1001, 1002, RECEIVERS OCCUPIED #1003 AND ALL POINTS NORTH. THE BASE WAS MOVED TO #1008 1003, 1006, 1045, 1046 AND 1047. POINT #1004 = "ELM" WAS INCLUDED IN THE 1994 WHILE #26 AND ALL POINTS SOUTH WERE OCCUPIED. THE BASE WAS THEN MOVED TO #199 NAD-83 POSITION (EPOCH 1997.0) COSCN BUT DESTROYED PRIOR TO THIS SURVEY. POINT #1003 KNOWN AS -STOCKTON SW WHILE #26 AND ALL POINTS SOUTH WERE OCCUPIED. FINALLY, THE BASE WAS MOVED TO TRANSFORMED FROM ITRF97 (EPOCH 1997.0) POSITION IN JULY 2000 BASE IS SHOWN BELOW AS AN EXAMPLE. THIS STATION WAS ESTABLISHED BY THE NGS IN #436 WHILE #1003 AND ALL POINTS NORTH WERE OCCUPIED. A TANDEM OPERATION OF FOUR RECEIVERS WAS RUN FROM #1045 ON THE NORTH TO #1043 ON THE SOUTH IN THREE X = -2616491.161 M LATITUDE = 37 53 47.04172 N 1954 AND HAS VALID POSITIONS ON THE FOLLOWING NAD 83 EPOCHS AND NAD 27. THE SESSIONS ON A SEPARATE DAY. ADDITIONAL OCCUPATIONS WERE MADE OVER THE COURSE POSITIONS ARE LISTED FROM THE LATEST TO THE EARLIEST WITH THE DIFFERENCES IN OF THE SURVEY WHERE UNACCEPTABLE RESIDUALS WERE EXPERIENCED. ALL POINTS IN THE Y = -4307015.289 M LONGITUDE = 121 16 42.52895 W METERS GIVEN FORWARD IN TIME. PRIMARY NETWORK WERE OCCUPIED THREE TO FOUR OR MORE TIMES AT DIFFERENT HOURS Z = 3896363.797 M ELLIPSOID HEIGHT = -20.151 M OF THE DAY ON DIFFERENT DAYS OVER A WEEK'S PERIOD. NAD-83 VELOCITY: TRANSFORMED FROM ITRF97 VELOCITY IN JULY 2000. POINT #1003 STOCKTON SW BASE THE GENERAL NETWORK WAS SURVEYED IN TWO PHASES. A BASE RECEIVER WAS SET UP ON COMPUTED DIFFERENCE TO > 1998.50 > 1991.35 DIFFERENT DAYS AT #10, #436, #1006 AND #340 WHILE FOUR TO FIVE ROVING RECEIVERS EPOCH N. LATITUDE W. LONGITUDE EH SOURCE OCCUPIED POINTS WITHIN 6 KILOMETERS COMPLETING A SINGLE OCCUPATION OF ALL POINTS. VX = 0.0003 M/YR NORTHWARD = 0.0137 M/YR +0.021 -0.077 1998.50 37 59 31.38245 121 18 39.32302 -27.13 COS 2000/GPS IN THE SECOND PHASE, A TANDEM OPERATION OF FOUR TO FIVE RECEIVERS WAS RUN IN VY = 0.0100 M/YR EASTWARD = -0.0049 M/YR -0.007 +0.028 SESSIONS CONNECTING THE NEAREST POINTS TO 1994 COSCN POINTS. ALL POINTS WERE "DIFF= +0.018M +0.024M OCCUPIED AT LEAST TWICE AT DIFFERENT HOURS OF THE DAY ON A DIFFERENT DAY. VZ = 0.0106 M/YR UPWARD = -0.0004 M/YR -0.001 +0.002 1997.30 37 59 31.38184 - 121. 18 39.32205 -27.14 CURRENT NGS/GPS ADJUSTMENTS: TWELVE ADJUSTMENTS ARE DISCUSSED IN THE GPS SURVEY REPORT ON FILE WITH THE CITY. THOSE ADJUSTMENTS PERTINENT TO THE DEVELOPMENT OF COORDINATES "DIFF= +0.012M -0.006M PUBLISHED ON THIS RECORD OF SURVEY ARE DISCUSSED BELOW: EPOCH LATITUDE LONGITUDE ELLIPSOID HEIGHT 1997.30 37 59 31.38143 121 18 39.32230 -27.05 SUPERSEDED NGS/GPS 1998.50 37 53 47.04240 121 16 42.52927 -20.151 DIFF= +0.058M +0.083M THE PRIMARY NETWORK (PN) WAS ANALYZED AND CONSTRAINED IN SEVERAL 1991.35 37 59 31.37954 121 18 39.31888 -27.04 SUPERSEDED NGS/GPS SUPPLEMENTARY ADJUSTMENTS FOR THE PURPOSE OF DEVELOPING A PRECISE GEOID MODEL THE DIFFERENCE FROM THE 1998.50 POSITION LISTED ABOVE TO THE COMPUTED POSITION AND DEVELOPING NAD 83, 1998.5 EPOCH POSITIONS. A MINIMALLY CONSTRAINED GENERATED IN AN ADJUSTMENT OF 51 VECTORS OVER A DIRECT DISTANCE OF 19 "DIFF= -0.011M -0.007M ADJUSTMENT #11 OF THE (PN) FIXED POINT #26 AT ITS ORIGINAL 1994 COSCN POSITION. KILOMETERS FROM #1045 IS N 0.0, E 0.4, UP -1.4 CENTIMETERS. THIS IS EQUIVALENT TO A 1991.35 37 59 31.37990 121 18 39.31918 -27.04 1994 COSCN/GPS VECTOR CONNECTIONS TO CORS STATION CNDR WERE REMOVED TO ANALYZE AND VALIDATE PRECISION RATIO OF 1:4,800,000 HORIZONTAL AND 1: 1,370,000 VERTICAL. THE INTEGRITY OF THE MEASUREMENTS OBTAINED WITH LIKE ANTENNAS IN THIS SURVEY. A "DIFF= -0.025M +0.019M MINIMALLY CONSTRAINED ADJUSTMENT #12 OF THE PN WAS PROCESSED AFTER SETTING FREE SEVEN VECTORS WITH VERTICAL RESIDUALS GREATER THAN THREE CENTIMETERS IDENTIFIED IN 1991.35 37 59 31.38072 121 18 39.31$39 SUPERSEDED NGS/CONVENTIONAL ADJUSTMENT #11. AS A RESULT, THE RESIDUALS AVERAGE 0.6 CENTIMETERS 2D HORIZONTAL ADJUSTMENT #98-2 FOLLOWED BY CONSTRAINING THE PRIMARY NETWORK TO #1045 = HPGN ''DIFF= +0.29M -0.15M AND 0.1 CENTIMETERS IN HEIGHT WITH A MAXIMUM OF 3.2 CENTIMETERS AND 2.9 STATION "W1413" AND CNDR TO ESTABLISH GEODETIC POSITIONS, ELLIPSOID HEIGHTS AND CENTIMETERS, RESPECTIVELY. THE VECTORS VARY FROM 1237 TO 13,279 METERS IN LENGTH STATE PLANE COORDINATES ON 14 POINTS ACROSS THE CITY BASED ON THE 1998.50 EPOCH 1984.00 37 59 31.37133 121 18 39.32438 NEW NAD 83 NGS/CONVENTIONAL AND AVERAGE 5939 METERS. DIFFERENCE FROM THE RECORD TO CALCULATED POSITIONS AS SHOWN IN THE COORDINATE TABLES HEREIN. DIFF= -8.5M +92.8M FOR 8 OF THE 14 PN POINTS THAT WERE PART OF THE 1994 COSCN ARE LISTED AS FOLLOWS: THE PREMISE FOR THE ADJUSTMENTS OF THE GENERAL NETWORK ARE ADDRESSED HERE. THE NAD 27 37 59 31.65200 121 18 35.50700 SUPERSEDED DATUM/NGS/CONVENTIONAL CITY OF STOCKTON COMPLETED THE ORIGINAL GPS CONTROL NETWORK IN 1994 BASED ON THE NAD 83, 1991.35 EPOCH ADJUSTMENT OF THE HPGN. THE 1994 COSCN WAS PUBLISHED COORDINATE CHANGES FROM RECORD 1994 TO COMPUTED (METERS) PRIOR TO THE TIME THE NGS PUBLISHED POSITIONS FOR HPGN DENSIFICATION STATIONS STATION DN DE DZ(EH) WITHIN STOCKTON. COMPARISONS LISTED PREVIOUSLY AT #1003 = -STOCKTON SW BASE" WITH THE NGS AGREE ONE CENTIMETER AT 20 KILOMETERS FROM THE ORIGINAL HPGN STATIONS EQUIPMENT, DATA COLLECTION & POST PROCESSING OF DATA: FOUR LEICA SYSTEM 300 AND 10 -0.003 0.003 -0.016 AND WELL WITHIN THE ORDER OF ACCURACY FOR BOTH SURVEYS. ONE LEICA SYSTEM 9500 DUAL FREQUENCY P-CODE RECEIVERS WERE UTILIZED TO COLLECT, 26 0.000 0.000 0.000 FIXED PROCESS AND STORE SATELLITE SIGNAL DATA. THE RECEIVERS WERE OPERATED BY CITY AND KJELDSEN, SINNOCK & NEUDECK, INC. STAFF. TWO METER FIXED HEIGHT POLES WERE 160 -0.003 0.015 0.000 THE CITY IS MOVING NORTHWESTERLY ABOUT 1-2 CENTIMETERS PER YEAR RELATIVE TO ' USED FOR THE FIELD OBSERVATIONS OF THE PRIMARY NETWORK AND THE GENERAL NETWORK. 291 -0.032 0.002 -0.045 THE NORTH AMERICAN PLATE. THE NGS HORIZONTAL TIME DISPLACEMENT PROGRAM A CALIBRATION SURVEY WAS PERFORMED AND PROCESSED TO VALIDATE THE EQUIPMENT, (HTDP) INDICATES A DIFFERENTIAL MOVEMENT BETWEEN THE NORTH AND SOUTH END OF PROCEDURES AND PERSONNEL. 340 0.000 0.007 -0.000 THE CITY (25 KILOMETERS) OF 0.7 MILLIMETERS. TAKING THE PERIOD OF TIME OF 9.5 341 0.010 0.013 -0.051 YEARS BETWEEN THE ORIGINAL 1991.35 PUBLISHED EPOCH AND THE PRESENT SURVEY, THE NAVSTAR GPS CONSTELLATION CONSISTED OF 27 BLOCK II SATELLITES. THE P-CODE THE ESTIMATED TOTAL DIFFERENTIAL MOVEMENT OF ABOUT 7 MILLIMETERS OR 1:4,000,000 WAS ENCRYPTED AND SA WAS OFF. PHASE AND CODE ON THE L1 & L2 FREQUENCIES (C/A 1003 -0.000 0.009 -0.014 IS NOT SIGNIFICANT. CODE, P-CODE ON L1 & P-CODE ON L2) WERE COLLECTED EVERY 10 SECONDS FROM 5-8 1008 0.008 -0.004 -0.015 SATELLITES ABOVE 13' WITH GDOP (GEOMETRIC DILUTION OF PRECISION) GENERALLY 2-8. MULTIPLE EPOCH ADJUSTMENTS OF THE NAD 83 DATUM EXIST WITHIN THE CITY AND THE LENGTH OF THE OBSERVATION TIMES WERE 10-15 MINUTES AND 15--30 MINUTES ON CONSIDERATION WAS GIVEN FOR UPDATING THE EPOCH OF THE COSCN TO THE LATEST THE PRIMARY NETWORK POINTS. PARTS OF THE CITY OF STOCKTON ARE KNOWN TO BE IN SUBSIDENCE ACCORDING TO THE 1D 1998.50 EPOCH. THE FOLLOWING FACTS WERE IDENTIFIED AND CONSIDERED:CITY SURVEYOR. POINT #26 LIES IN AN AREA THAT WAS CONSIDERED LEAST LIKELY TO ) THE CITY A TOTAL OF 188 POINTS WERE CONNECTED WITH 623 MEASURED VECTORS IN THIS SURVEY. HAVE EXPERIENCED SUBSIDENCE AND THEREFORE HELD FIXED IN THESE ADJUSTMENTS. THE ESTABLISHED A FIRST ORDER CONTROL NETWORK OF OVER 100 POINTS IN 1994, 2) SURVEYS DATA WAS PROCESSED USING THE LEICA "SKI" POST PROCESSING SOFTWARE VERSION 2.3. CHANGES IN THE ELLIPSOID HEIGHTS BETWEEN THE 1994 AND 2000 SURVEYS ARE 0 TO 5 WITHIN THE CITY HAVE BEEN BASED ON THE 1994 GPS SURVEY FOR OVER 7 YEARS, 3) THE THE PN BASELINES WERE PROCESSED WITH A PRECISE EPHEMERIS O A CUTOFF VERTICAL CENTIMETERS LOWER, AVERAGING 2 CENTIMETERS. CITY'S GIS HAS BEEN POPULATED BASED ON THE 1994 NETWORK, 4) DIFFERENTIAL MOVEMENT OF THE EXISTING COSCN WITHIN THE CITY IS NOT SIGNIFICANT AS NOTED ABOVE, ANGLE OF 17' ABOVE THE HORIZON; BASELINES GREATER THAN FIVE KILOMETERS WERE GENERALLY COMPUTED USING AN IONOSPHERIC FREE FIXED SOLUTION. THE GENERAL NETWORK IN ADJUSTMENT #98-1 THE NETWORK WAS MINIMALLY CONSTRAINED TO #1045 = HPGN 5) THE CE SURVEY IS EL, 6) THE WITH THE NATIONAL SPATIAL REFERENCE SYSTEM AT BASELINES WERE PROCESSED WITH A BROADCAST EPHEMERIS AT A CUTOFF VERTICAL ANGLE STATION "W1413" (NORTH OF THE CITY) ON NAD 83, 1998.50 EPOCH TO VERIFY THE THE ONE CENTIMETER LEVEL, 6) THE INTENT OF THIS SURVEY IS TO DENSTIOIFY THE 1994 OF 15'. ANALYSIS OF PROCESSING STATISTICS AND ADJUSTMENT RESIDUALS LED TO THE POSITION OF CNDR = CORS STATION CONDOR (SOUTH OF THE CITY). THE POSITION OF NETWORK AND AID T PROVIDING LOCAL SURVEYS WITH FIRST ORDER POSITIONS U EXISTING REJECTION OF 24 VECTORS. THE WGS 84 VECTORS WERE CONVERTED TO NAD 83 GEODETIC CNDR IS PUBLISHED BY THE NGS ON THE 1997.00 EPOCH LISTED BELOW. THE PUBLISHED CONVENTIONAL CONTROL POINTS CONSISTENT WITH THE REQUIREMENTS OF THE PUBLIC COORDINATES AND ELLIPSOID HEIGHTS WITH "STARNET-PRO" VERSION 6.0 NETWORK NAD 83 VELOCITIES, COMPUTED IN JULY 2000, WERE APPLIED AS SHOWN TO DETERMINE RESOURCES CODE. GIVEN THE AFORESAID, THE CITY DETERMINED THE HIGHEST AND BEST USE OF THE: COSCN WAS TO REMAIN ON THE 1991.35 EPOCH CONSISTENT WITH THE 1994 COSCN. ADJUSTMENT SOFTWARE. CNDR'S EQUIVALENT POSITION AT THE 1998.50 EPOCH AND THE 1991.35 EPOCH. SHEET 2 OF 14