HV1838 ***********************************************************************
HV1838  DESIGNATION -  I=M 8=TIDAL BM PBPP
HV1838  PID         -  HV1838
HV1838  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
HV1838  USGS QUAD   -  WASHINGTON WEST (1983)
HV1838
HV1838                         *CURRENT SURVEY CONTROL
HV1838  ___________________________________________________________________
HV1838* NAD 83(1986)-  38 53 22.     (N)    077 01 59.     (W)     SCALED
HV1838* NAVD 88     -         6.021  (meters)      19.75   (feet)  ADJUSTED
HV1838  ___________________________________________________________________
HV1838  GEOID HEIGHT-         -32.05  (meters)                     GEOID99
HV1838  DYNAMIC HT  -           6.017 (meters)      19.74  (feet)  COMP
HV1838  MODELED GRAV-     980,098.1   (mgal)                       NAVD 88
HV1838  OBS GRAVITY -     980,102.3   (mgal)                       GRAV_OBS
HV1838
HV1838  VERT ORDER  -  FIRST     CLASS II
HV1838
HV1838.The horizontal coordinates were scaled from a topographic map and have
HV1838.an estimated accuracy of +/- 6 seconds.
HV1838
HV1838.The orthometric height was determined by differential leveling
HV1838.and adjusted by the National Geodetic Survey in June 1991.
HV1838
HV1838.The geoid height was determined by GEOID99.
HV1838
HV1838.The dynamic height is computed by dividing the NAVD 88
HV1838.geopotential number by the normal gravity value computed on the
HV1838.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HV1838.degrees latitude (g = 980.6199 gals.).
HV1838
HV1838.The modeled gravity was interpolated from observed gravity values.
HV1838.The observed gravity was obtained from relative gravimeter ties
HV1838.to the IGSN71 gravity network.
HV1838
HV1838                          SUPERSEDED SURVEY CONTROL
HV1838
HV1838  NGVD 29     -         6.255  (m)           20.52   (f) ADJUSTED    1 2
HV1838
HV1838.Superseded values are not recommended for survey control.
HV1838.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV1838.See file dsdata.txt to determine how the superseded data were derived.
HV1838
HV1838_MARKER: X = CHISELED CROSS
HV1838_SETTING: 30 = STEP
HV1838_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
HV1838
HV1838  HISTORY     - Date     Condition        Recov. By
HV1838  HISTORY     - UNK      MONUMENTED       PBPP
HV1838  HISTORY     - 1941     GOOD             CGS
HV1838  HISTORY     - 1956     GOOD             CGS
HV1838  HISTORY     - 1978     GOOD             DMA
HV1838
HV1838                          STATION DESCRIPTION
HV1838
HV1838''DESCRIBED BY COAST AND GEODETIC SURVEY 1941
HV1838''AT WASHINGTON.
HV1838''AT WASHINGTON, JUST EAST OF THE WASHINGTON MONUMENT, ON THE
HV1838''EAST SIDE OF A SMALL LODGE, AT THE MAIN ENTRANCE, ON THE TOP
HV1838''OF THE NORTH END OF THE TOP STEP, 3 INCHES FROM THE SOUTH SIDE
HV1838''OF THE BASE OF A COLUMN, AND 3 INCHES FROM THE EAST EDGE.  THE
HV1838''SOUTHWEST QUADRANT OF A CHISELED CROSS.
HV1838
HV1838                          STATION RECOVERY (1956)
HV1838
HV1838''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
HV1838''RECOVERED IN GOOD CONDITION.
HV1838
HV1838                          STATION RECOVERY (1978)
HV1838
HV1838''RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
HV1838''RECOVERED IN GOOD CONDITION.