RECORD OF SURVEY 30-018 - Laserfiche WebLink

Home Browse Search

/ 1 HISTORY GRID COMPARISON IN JULY OF 1987 THE CITY OF TRACY SELECTED VARIATION BETWEEN THE EXTREME COMBINED FACTORS AND THE MEAN SURVEYOR ' S STATEMENT 00 KENNEDY/JENKS/CHILTON TO SET 12 SURVEY CONTROL MONUMENTS, COMBINED FACTOR WERE CALCULATED TO COMPARE PRECISION BETWEEN ESTABLISHING STATE PLANE COORDINATES BASED ON CALIFORNIA GROUND DISTANCE AND THE MODIFIED GRID LENGTH . THIS THIS MAP CORRECTLY REPRESENTS A SURVEY MADE BY ME i COORDINATE SYSTEM ZONE 3, UTILIZING RELATIVE POSITIONING COMPARISON WAS MADE BY COMBINING THE SCALE FACTOR AND OR UNDER MY DIRECTION IN CONFORMANCE WITH THE DIFFERENTIAL GLOBAL POSITIONING SYSTEM SATELLITE SURVEYING ELEVATION FACTOR FOR,EACH EXTREMITY, THEN REQUIREMENTS OF THE LAND SURVEYORS ' ACT AT THE TECHNIQUES, AND CONSTRUCTING A MODIFIED COORDINATE CHECKING THESE VARIATIONS FROM THE MEAN. REQUEST OF THE CITY OF TRACY . M GRID SYSTEM FOR FUTURE USE . - ELEVATION SCALE COMBINED RATIO OF KENNEDY/JENKS/CHILTON SET THE MONUMENTS AND THEIR SUB- AREA ELEVATION FACTOR FACTOR FACTOR VARIATIONFo CONSULTANT "GEOPHYSICAL SERVICES. INC . " PERFORMED THE NORTH 0 . 00 ' 1 . 000 0 . 9999293 0 . 9999293 1/243623 MEASUREMENTS DURING THE LAST WEEK IN JULY 1987 UTILIZING CENTER 90 . 00 ' 0 . 999995695 0 . 9999295 0 . 999925195 TI-3100 GLOBAL POSITIONING RECEIVERS AND ANTENNA UNITS, TI SOUTH 200 . 00 ' 0 . 999990433 0 . 9999303 0 .999920734 1/224150 ' PHILLIP M . MOTT, S . n3BJ ] DATE 3� t9�0 PROLITE COMPUTER/DATA RECORDING DEVICE. MAGNET-4199GOS EXPIRES: 6-30-88 DIFFERENTIAL SURVEY PROGRAM AND GEOLAB LEAST SQUARES ADJUSTMENT PROGRAM . JF CA01J�I IT WAS INTENDED TO PUBLISH THE RESULTS OF THE GPS SURVEY A MORE EXACT MEAN GROUND TO GRID FACTOR WAS COMPUTED AND ITS IN BOTH NAD 27 AND NAD 83 VALUES, HOWEVER AS OF THE RECIPROCAL, 1 . 000074726, WAS' UTILIZED TO MODIFY THE COUNTY SURVEYOR ' S STATEMENT DATE OF THIS SURVEY( THE NATIONAL GEODETIC SURVEY HAD NOT CALIFORNIA ZONE III SYSTEM . PUBLISHED NAD 83 VALUES FOR THE TRACY AREA . THE TRACY MODIFIED GRID IS BASED UPON THE CALIFORNIA STATE THIS MAP HAS BEEN EXAMINED IN ACCORDANCE 'WITH PLANE COORDINATE SYSTEM ZONE III, AND WAS CREATED AT AN SECTION 8766 OF THE LAND SURVEYORS ' ACT ELEVATION OF 90 FEET ABOVE SEA LEVEL BASED UPON THE NORTH THIS DAY OFA _ 1988 . CONSTRUCTION OF THE TRACY MODIFIED GRID SYSTEM AMERICAN VERTICAL DATUM OF 1929 . TO CONVERT CALIFORNIA ZONE III COORDINATES MULTIPLY THE NORTHING AND EASTING VALUES BY Q� -! THE ELEVATION OF THE MODIFIED GRID AREA RANGES FROM 200 . 00 1 . 000074728 TO DEVELOP COORDINATES ON THE TRACY MODIFIED GAIO FEET ABOVE SEA LEVEL AT THE TRACY MUNICIPAL AIRPORT TO NEARLY SYSTEM . THE ERROR INTRODUCED BY THIS METHOD AT EITHERlzL ` SEA LEVEL AT WHITEHALL ROAD NORTH OF TRACY . AN AVERAGE EXTREMITY BETWEEN MODIFIED COORDINATES AND A MEASURED GROUND COUNTY SURVEY R No. 21258 z, ELEVATION OF 90 FEET ABOVE SEA LEVEL WAS DETERMINED TO BE DISTANCE OF 10. 000 FEET WOULD THEORETICALLY BE NO MORE THAN NO . Z�_ 1Z ff 5 E,uy. ;�;y 1 APPROPRIATE FOR CALCULATING THE FACTORS TO BE ASSOCIATED WITH 0 . 044 FEET . THE TRACY MODIFIED GRID SYSTEM . AT EITHER EXTREME OF THE riglf�l Cft ��4`�` MODIFIED GRID AREA THE RATIO OF VARIATION FROM THE MEAN ELEVATION FACTOR WASE FOUND TO BE NO MORE THAN 1 PART IN 190, 000 . NOTES: 1 , IT WAS NEVER THE INTENT OF THIS SURVEY TO HAVE THE RECORDER ' S CERTIFICATE G . P . S . STATIONS INTER-VISIBLE . THE BEARINGS AND �— ELEVATION RATIO OF DISTANCES SHOWN HEREON ARE CALCULATED AND MAY OR AREA ELEVATION FACTOR VARIATION MAY NOT BE INTER-VISIBLE . THEY ARE BEING SHOWN AT FIL D TH S �iE/ DAY OF / 1988 NORTH 0 . 00 ' 1 . 000000 1/232290 THE REQUEST OF THE SAN JOAQUIN COUNTY SURVEYOR . AT w�� M . N BOOK15 OF 5 U RVE Ys,_ CENTER 90 . 00 ' 0 . 999995695 2 . ALL DISTANCES SHOWN HEREON ARE CALCULATED GROUND AT PAGE AT THE REQUEST OF SOUTH 200 . 00 ' 0 . 999990433 1/190040 DISTANCES . THE CITY OF TRACY . 7- C ELEVATION COMPARISON C�7UNTY RECORDE DATUM POINT -- MONUMENT COVER THE TRACY MODIFIED GRID SYSTEM IS A MODIFICATION OF THE ----GROUND CALIFORNIA ZONE III STATE PLANE COORDINATE SYSTEM . THE � - j =�%