The NGS Data Sheet
See file dsdata.pdf for more information about the datasheet.
PROGRAM = datasheet95, VERSION = 8.12.5.19
Starting Datasheet Retrieval...
1 National Geodetic Survey, Retrieval Date = FEBRUARY 18, 2025 04:57:07 EST
DL7335 ***********************************************************************
DL7335 CORS - This is a GPS Continuously Operating Reference Station.
DL7335 DESIGNATION - HELENA CORS ARP
DL7335 CORS_ID - MTDT
DL7335 PID - DL7335
DL7335 STATE/COUNTY- MT/LEWIS AND CLARK
DL7335 COUNTRY - US
DL7335 USGS QUAD - EAST HELENA (2017)
DL7335
DL7335 *CURRENT SURVEY CONTROL
DL7335 ______________________________________________________________________
DL7335* NAD 83(2011) POSITION- 46 35 18.59145(N) 111 59 36.96274(W) ADJUSTED
DL7335* NAD 83(2011) ELLIP HT- 1217.743 (meters) (06/??/19) ADJUSTED
DL7335* NAD 83(2011) EPOCH - 2010.00
DL7335 ______________________________________________________________________
DL7335 GEOID HEIGHT - -13.097 (meters) GEOID18
DL7335 NAD 83(2011) X - -1,644,768.027 (meters) COMP
DL7335 NAD 83(2011) Y - -4,072,253.142 (meters) COMP
DL7335 NAD 83(2011) Z - 4,611,331.233 (meters) COMP
DL7335
DL7335 Network accuracy estimates per FGDC Geospatial Positioning Accuracy
DL7335 Standards:
DL7335 FGDC (95% conf, cm) Standard deviation (cm) CorrNE
DL7335 Horiz Ellip SD_N SD_E SD_h (unitless)
DL7335 -------------------------------------------------------------------
DL7335 NETWORK 0.14 0.37 0.06 0.06 0.19 0.20864400
DL7335 -------------------------------------------------------------------
DL7335
DL7335.The coordinates were established by GPS observations
DL7335.and adjusted by the National Geodetic Survey in June 2019.
DL7335
DL7335.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has
DL7335.been affixed to the stable North American Tectonic Plate.
DL7335
DL7335.The coordinates are valid at the epoch date displayed above
DL7335.which is a decimal equivalence of Year/Month/Day.
DL7335
DL7335.Due to the release of the International GNSS Service (IGS) 2014
DL7335.realization of the International Terrestrial Reference Frame of 2014
DL7335.(ITRF2014), NGS reprocessed all NOAA CORS Network and some IGS stations
DL7335.using data collected between 1/1/1996 and 1/30/2017. The resulting ITRF2014
DL7335.epoch 2010.00 coordinates, referred to as Multi-Year CORS Solution 2
DL7335.(MYCS2), were transformed to NAD 83 (2011/PA11/MA11) maintaining the
DL7335.currently published epoch of 2010.00.
DL7335
DL7335.Additional information on MYCS2 is available at
DL7335.https://geodesy.noaa.gov/CORS/news/mycs2/mycs2.shtml
DL7335
DL7335.Significant digits in the geoid height do not necessarily reflect accuracy.
DL7335.GEOID18 height accuracy estimate available here.
DL7335
DL7335.The PID for the CORS L1 Phase Center is DL7336.
DL7335
DL7335.Click photographs - Photos may exist for this station.
DL7335
DL7335.The XYZ, and position/ellipsoidal ht. are equivalent.
DL7335
DL7335.The ellipsoidal height was determined by GPS observations
DL7335.and is referenced to NAD 83.
DL7335
DL7335. The following values were computed from the NAD 83(2011) position.
DL7335
DL7335; North East Units Scale Factor Converg.
DL7335;SPC MT - 262,899.351 409,038.662 MT 0.99941986 -1 49 26.7
DL7335;SPC MT - 862,530.68 1,341,990.36 iFT 0.99941986 -1 49 26.7
DL7335;UTM 12 - 5,159,916.462 423,883.133 MT 0.99967121 -0 43 18.6
DL7335
DL7335! - Elev Factor x Scale Factor = Combined Factor
DL7335!SPC MT - 0.99980915 x 0.99941986 = 0.99922912
DL7335!UTM 12 - 0.99980915 x 0.99967121 = 0.99948042
DL7335
DL7335_U.S. NATIONAL GRID SPATIAL ADDRESS: 12TVS2388359916(NAD 83)
DL7335
DL7335 SUPERSEDED SURVEY CONTROL
DL7335
DL7335 NAD 83(2011)- 46 35 18.59143(N) 111 59 36.96254(W) AD(2010.00) c
DL7335 ELLIP H (08/??/11) 1217.739 (m) GP(2010.00) c c
DL7335 NAD 83(CORS)- 46 35 18.59112(N) 111 59 36.96412(W) AD(2002.00) c
DL7335 ELLIP H (04/??/10) 1217.756 (m) GP(2002.00) c c
DL7335
DL7335.Superseded values are not recommended for survey control.
DL7335
DL7335.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
DL7335.See file dsdata.pdf to determine how the superseded data were derived.
DL7335
DL7335_MARKER: STATION IS THE ANTENNA REFERENCE POINT OF THE GPS ANTENNA
DL7335
DL7335 STATION DESCRIPTION
DL7335
DL7335'DESCRIBED BY NATIONAL GEODETIC SURVEY 2019
DL7335'STATION IS PART OF THE NOAA CORS NETWORK. LATEST INFORMATION INCLUDING
DL7335'POSITIONS AND VELOCITIES ARE AVAILABLE IN THE COORDINATE AND LOG FILES
DL7335'ACCESSIBLE AT THE WORLDWIDE WEB.
DL7335'https://geodesy.noaa.gov/CORS/data.shtml
DL7335'https://geodesy.noaa.gov/CORS
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