JV1546 ***********************************************************************
JV1546  DESIGNATION -  25 PRR
JV1546  PID         -  JV1546
JV1546  STATE/COUNTY-  MD/BALTIMORE
JV1546  USGS QUAD   -  PHOENIX (1974)
JV1546
JV1546                         *CURRENT SURVEY CONTROL
JV1546  ___________________________________________________________________
JV1546* NAD 83(1986)-  39 34 17.     (N)    076 37 06.     (W)     SCALED
JV1546* NAVD 88     -        94.193  (meters)     309.03   (feet)  ADJUSTED
JV1546  ___________________________________________________________________
JV1546  GEOID HEIGHT-         -32.37  (meters)                     GEOID99
JV1546  DYNAMIC HT  -          94.145 (meters)     308.87  (feet)  COMP
JV1546  MODELED GRAV-     980,118.3   (mgal)                       NAVD 88
JV1546
JV1546  VERT ORDER  -  SECOND    CLASS 0
JV1546
JV1546.The horizontal coordinates were scaled from a topographic map and have
JV1546.an estimated accuracy of +/- 6 seconds.
JV1546
JV1546.The orthometric height was determined by differential leveling
JV1546.and adjusted by the National Geodetic Survey in June 1991.
JV1546
JV1546.The geoid height was determined by GEOID99.
JV1546
JV1546.The dynamic height is computed by dividing the NAVD 88
JV1546.geopotential number by the normal gravity value computed on the
JV1546.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
JV1546.degrees latitude (g = 980.6199 gals.).
JV1546
JV1546.The modeled gravity was interpolated from observed gravity values.
JV1546
JV1546;                    North         East    Units  Estimated Accuracy
JV1546;SPC MD       -   211,510.      432,800.      MT  (+/- 180 meters Scaled)
JV1546
JV1546                          SUPERSEDED SURVEY CONTROL
JV1546
JV1546  NGVD 29     -        94.431  (m)          309.81   (f) ADJUSTED    2 0
JV1546
JV1546.Superseded values are not recommended for survey control.
JV1546.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
JV1546.See file dsdata.txt to determine how the superseded data were derived.
JV1546
JV1546_MARKER: B = BOLT
JV1546_SETTING: 36 = BRIDGE
JV1546_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
JV1546
JV1546  HISTORY     - Date     Condition        Recov. By
JV1546  HISTORY     - UNK      MONUMENTED       PRR
JV1546  HISTORY     - 1935     GOOD             CGS
JV1546
JV1546                          STATION DESCRIPTION
JV1546
JV1546''DESCRIBED BY COAST AND GEODETIC SURVEY 1935
JV1546''AT CORBETT.
JV1546''AT CORBETT, BALTIMORE COUNTY, 0.3 MILE NORTH OF THE PENNSYLVANIA
JV1546''STATION, ABOUT 510 FEET SOUTH OF SIGNAL 22.6, IN THE TOP OF THE
JV1546''EAST END OF BRIDGE 22.41, AND 10 FEET EAST OF THE CENTERLINE OF
JV1546''THE EAST TRACK.  A COPPER BOLT.