HV1847 ***********************************************************************
HV1847  DESIGNATION -  ZERO MILESTONE
HV1847  PID         -  HV1847
HV1847  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
HV1847  USGS QUAD   -  WASHINGTON WEST (1983)
HV1847
HV1847                         *CURRENT SURVEY CONTROL
HV1847  ___________________________________________________________________
HV1847* NAD 83(1993)-  38 53 42.38730(N)    077 02 11.57321(W)     ADJUSTED
HV1847* NAVD 88     -         8.382  (meters)      27.50   (feet)  ADJUSTED
HV1847  ___________________________________________________________________
HV1847  X           -   1,115,058.544 (meters)                     COMP
HV1847  Y           -  -4,843,944.199 (meters)                     COMP
HV1847  Z           -   3,983,245.947 (meters)                     COMP
HV1847  LAPLACE CORR-          -2.47  (seconds)                    DEFLEC99
HV1847  ELLIP HEIGHT-         -23.63  (meters)                     GPS OBS
HV1847  GEOID HEIGHT-         -32.03  (meters)                     GEOID99
HV1847  DYNAMIC HT  -           8.377 (meters)      27.48  (feet)  COMP
HV1847  MODELED GRAV-     980,097.7   (mgal)                       NAVD 88
HV1847
HV1847  HORZ ORDER  -  FIRST
HV1847  VERT ORDER  -  FIRST     CLASS II
HV1847  ELLP ORDER  -  FOURTH    CLASS I
HV1847
HV1847.The horizontal coordinates were established by GPS observations
HV1847.and adjusted by the National Geodetic Survey in June 1994.
HV1847
HV1847.The orthometric height was determined by differential leveling
HV1847.and adjusted by the National Geodetic Survey in May 1999.
HV1847.WARNING-Repeat measurements at this control monument indicate possible
HV1847.vertical movement.
HV1847
HV1847.The X, Y, and Z were computed from the position and the ellipsoidal ht.
HV1847
HV1847.The Laplace correction was computed from DEFLEC99 derived deflections.
HV1847
HV1847.The ellipsoidal height was determined by GPS observations
HV1847.and is referenced to NAD 83.
HV1847
HV1847.The geoid height was determined by GEOID99.
HV1847
HV1847.The dynamic height is computed by dividing the NAVD 88
HV1847.geopotential number by the normal gravity value computed on the
HV1847.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HV1847.degrees latitude (g = 980.6199 gals.).
HV1847
HV1847.The modeled gravity was interpolated from observed gravity values.
HV1847
HV1847;                    North         East     Units   Scale      Converg.
HV1847;SPC MD       -   447,383.75  1,301,931.31   sFT  0.99994990 -0 01 22.6
HV1847;SPC MD       -   136,362.839   396,829.458   MT  0.99994990 -0 01 22.6
HV1847;SPC VA N     - 2,137,368.947 3,626,950.095   MT  0.99996009 +0 54 48.1
HV1847;UTM  18      - 4,307,108.010   323,383.699   MT  0.99998412 -1 16 44.7
HV1847
HV1847|---------------------------------------------------------------------|
HV1847| PID    Reference Object                     Distance      Geod. Az  |
HV1847|                                                           dddmmss.s |
HV1847| HV1846 MERIDIAN STONE                      130.049 METERS 17951     |
HV1847|---------------------------------------------------------------------|
HV1847
HV1847                          SUPERSEDED SURVEY CONTROL
HV1847
HV1847  NAD 83(1993)-  38 53 42.38732(N)    077 02 11.57320(W) AD(       ) 1
HV1847  NAD 83(1991)-  38 53 42.38738(N)    077 02 11.57308(W) AD(       ) 1
HV1847  ELLIP HT    -         -23.66  (m)                      GP(       ) 4 2
HV1847  NGVD 29     -         8.617  (m)           28.27   (f) ADJUSTED    1 0
HV1847
HV1847.Superseded values are not recommended for survey control.
HV1847.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV1847.See file dsdata.txt to determine how the superseded data were derived.
HV1847
HV1847_PROJECTION: FLUSH
HV1847_MAGNETIC: N = NO MAGNETIC MATERIAL
HV1847_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
HV1847_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
HV1847+SATELLITE: SATELLITE OBSERVATIONS - June 15, 1992
HV1847
HV1847  HISTORY     - Date     Condition        Recov. By
HV1847  HISTORY     - UNK      MONUMENTED       PBPP
HV1847  HISTORY     - 1926     GOOD             CGS
HV1847  HISTORY     - 1974     GOOD             NGS
HV1847  HISTORY     - 1979     GOOD             NGS
HV1847  HISTORY     - 1984     GOOD             NGS
HV1847  HISTORY     - 19920615 GOOD             NGS
HV1847  HISTORY     - 19920615 GOOD             NGS
HV1847  HISTORY     - 19980928 GOOD             NGS
HV1847
HV1847                          STATION DESCRIPTION
HV1847
HV1847''DESCRIBED BY COAST AND GEODETIC SURVEY 1926
HV1847''AT WASHINGTON.
HV1847''AT WASHINGTON, AT THE NORTH SIDE OF THE ELLIPSE, AT THE JUNCTION
HV1847''OF THE ELLIPSE ROAD AND THE STREET SOUTH OF THE WHITE HOUSE
HV1847''GROUNDS, BETWEEN TWO CONCRETE SIDEWALKS, AND AT THE ZERO
HV1847''MILESTONE.  THE TOP OF A SMALL PYRAMID AT THE CENTER OF A BRONZE
HV1847''COMPASS ROSE ON TOP OF THE MILESTONE.  NOTE-- TIDAL STATION
HV1847''PREVIOUSLY DESIGNATED ZERO MILESTONE=NW 2=TIDAL MARK.
HV1847
HV1847                          STATION RECOVERY (1974)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
HV1847''RECOVERED IN GOOD CONDITION.
HV1847
HV1847                          STATION RECOVERY (1979)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
HV1847''RECOVERED IN GOOD CONDITION.
HV1847
HV1847                          STATION RECOVERY (1984)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
HV1847''RECOVERED IN GOOD CONDITION.
HV1847
HV1847                          STATION RECOVERY (1992)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
HV1847''IN WASHINGTON, D.C., NEAR THE NORTH SIDE OF THE ELLIPSE, AT THE
HV1847''JUNCTION OF THE ELLIPSE ROAD AND THE STREET SOUTH OF THE WHITE HOUSE
HV1847''GROUNDS, BETWEEN TWO CONCRETE SIDEWALKS, AND AT THE ZERO MILESTONE.
HV1847''THE TOP OF A SMALL PYRAMID AT THE CENTER OF A BRONZE COMPASS ROSE ON
HV1847''TOP OF THE MILESTONE.
HV1847
HV1847                          STATION RECOVERY (1992)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
HV1847''THE STATION IS AT WASHINGTON, D.C. AT THE NORTH SIDE OF THE ELLIPSE,
HV1847''AT THE JUNCTION OF THE ELLOPSE ROAD AND THE STREET SOUTH OF THE WHITE
HV1847''HOUSE GROUNDS, BETWEEN TWO CONCRETE SIDEWALKS, AND AT THE ZERO
HV1847''MILESTONE.  OWNERSHIP--U.S. GOVERNMENT
HV1847''THE STATION IS THE TOP OF A SMALL PYRAMID AT THE CENTER OF A BRONZE
HV1847''COMPASS ROSE ON TOP OF THE MILESTONE.
HV1847
HV1847                          STATION RECOVERY (1998)
HV1847
HV1847''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
HV1847''RECOVERED AS DESCRIBED.