1 National Geodetic Survey, Retrieval Date = DECEMBER 8, 2003 AJ8011 *********************************************************************** AJ8011 CBN - This is a Cooperative Base Network Control Station. AJ8011 DESIGNATION - PORTER AJ8011 PID - AJ8011 AJ8011 STATE/COUNTY- MD/WICOMICO AJ8011 USGS QUAD - HEBRON (1992) AJ8011 AJ8011 *CURRENT SURVEY CONTROL AJ8011 ___________________________________________________________________ AJ8011* NAD 83(1991)- 38 26 06.66223(N) 075 40 43.82204(W) ADJUSTED AJ8011* NAVD 88 - 12.979 (meters) 42.58 (feet) ADJUSTED AJ8011 ___________________________________________________________________ AJ8011 X - 1,237,409.529 (meters) COMP AJ8011 Y - -4,847,071.035 (meters) COMP AJ8011 Z - 3,943,381.973 (meters) COMP AJ8011 LAPLACE CORR- -1.67 (seconds) DEFLEC99 AJ8011 ELLIP HEIGHT- -22.65 (meters) (02/12/02) GPS OBS AJ8011 GEOID HEIGHT- -35.65 (meters) GEOID99 AJ8011 DYNAMIC HT - 12.971 (meters) 42.56 (feet) COMP AJ8011 MODELED GRAV- 980,012.0 (mgal) NAVD 88 AJ8011 AJ8011 HORZ ORDER - A AJ8011 VERT ORDER - SECOND CLASS I AJ8011 ELLP ORDER - FOURTH CLASS I AJ8011 AJ8011.The horizontal coordinates were established by GPS observations AJ8011.and adjusted by the National Geodetic Survey in February 2002. AJ8011 AJ8011.The orthometric height was determined by differential leveling AJ8011.and adjusted by the National Geodetic Survey in November 2003. AJ8011 AJ8011.The X, Y, and Z were computed from the position and the ellipsoidal ht. AJ8011 AJ8011.The Laplace correction was computed from DEFLEC99 derived deflections. AJ8011 AJ8011.The ellipsoidal height was determined by GPS observations AJ8011.and is referenced to NAD 83. AJ8011 AJ8011.The geoid height was determined by GEOID99. AJ8011 AJ8011.The dynamic height is computed by dividing the NAVD 88 AJ8011.geopotential number by the normal gravity value computed on the AJ8011.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 AJ8011.degrees latitude (g = 980.6199 gals.). AJ8011 AJ8011.The modeled gravity was interpolated from observed gravity values. AJ8011 AJ8011; North East Units Scale Converg. AJ8011;SPC MD - 86,143.251 515,345.272 MT 0.99997923 +0 49 45.1 AJ8011;SPC MD - 282,621.65 1,690,761.95 sFT 0.99997923 +0 49 45.1 AJ8011;UTM 18 - 4,254,319.560 440,753.317 MT 0.99964323 -0 25 19.2 AJ8011 AJ8011 SUPERSEDED SURVEY CONTROL AJ8011 AJ8011.No superseded survey control is available for this station. AJ8011 AJ8011_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SVH4075354320(NAD 83) AJ8011_MARKER: DD = SURVEY DISK AJ8011_SETTING: 31 = DROP INLET AJ8011_STAMPING: PORTER 1991 AJ8011_MARK LOGO: MDSHA AJ8011_MAGNETIC: O = OTHER; SEE DESCRIPTION AJ8011_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY AJ8011_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR AJ8011+SATELLITE: SATELLITE OBSERVATIONS - May 02, 2001 AJ8011 AJ8011 HISTORY - Date Condition Report By AJ8011 HISTORY - 1991 MONUMENTED MDSHA AJ8011 HISTORY - 20000410 GOOD MDSHA AJ8011 HISTORY - 20010502 GOOD MDSHA AJ8011 AJ8011 STATION DESCRIPTION AJ8011 AJ8011'DESCRIBED BY MARYLAND DOT HIGHWAY ADMINISTRATION 2000 (SFK) AJ8011'THE STATION IS LOCATED ABOUT 6.7 MILES (10.8 KM) NORTHWEST OF AJ8011'SALISBURY, 8.5 MILES (13.7 KM) SOUTHEAST OF VIENNA, AND 1.5 MILES (2.4 AJ8011'KM) NORTHEAST OF HEBRON. TO REACH THE STATION FROM THE INTERSECTION AJ8011'OF STATE HIGHWAY 349 AND U.S.HIGHWAY 50 IN SALISBURY, GO NORTHWEST AJ8011'ALONG U.S.HIGHWAY 50 FOR 6.0 MILES (9.7 KM) TO THE STATION ON THE LEFT AJ8011'IN THE GRASS MEDIAN. THE STATION IS A MARYLAND STATE HIGHWAY SURVEY AJ8011'DISK SET IN A DRILL HOLE IN THE SOUTHWEST CORNER OF A CONCRETE DROP AJ8011'INLET. IT IS 34.0 FEET (10.4 M) NORTHEAST OF THE CENTER LINE OF THE AJ8011'EASTBOUND LANES OF THE HIGHWAY, 33.5 FEET (10.2 M) SOUTHWEST OF THE AJ8011'CENTER LINE OF THE WESTBOUND LANES OF THE HIGHWAY, AND 43.5 FEET (13.3 AJ8011'M) SOUTHEAST OF THE PROJECTED CENTER LINE OF A GRAVEL DRIVEWAY LEADING AJ8011'NORTHEAST TO HOUSE NUMBER 26910. AJ8011 AJ8011 STATION RECOVERY (2001) AJ8011 AJ8011'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2001 (SFK) AJ8011'RECOVERED AS DESCRIBED.