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 04:54:28 EST
DF8771 ***********************************************************************
DF8771 HT_MOD - This is a Height Modernization Survey Station.
DF8771 CORS - This is a GPS Continuously Operating Reference Station.
DF8771 DESIGNATION - C OF HOUSTON COOP CORS ARP
DF8771 CORS_ID - COH1
DF8771 PID - DF8771
DF8771 STATE/COUNTY- TX/HARRIS
DF8771 COUNTRY - US
DF8771 USGS QUAD - ALIEF (2019)
DF8771
DF8771 *CURRENT SURVEY CONTROL
DF8771 ______________________________________________________________________
DF8771* NAD 83(2011) POSITION- 29 40 13.19519(N) 095 32 33.36099(W) ADJUSTED
DF8771* NAD 83(2011) ELLIP HT- -4.919 (meters) (06/??/19) ADJUSTED
DF8771* NAD 83(2011) EPOCH - 2010.00
DF8771* NAVD 88 ORTHO HEIGHT - **(meters) **(feet) NOT PUB
DF8771 **This station is in an area of suspected vertical motion (see below).
DF8771 ______________________________________________________________________
DF8771 NAVD 88 orthometric height was determined with geoid model GEOID09
DF8771 GEOID HEIGHT - -27.479 (meters) GEOID09
DF8771 GEOID HEIGHT - -27.320 (meters) GEOID18
DF8771 NAD 83(2011) X - -535,706.770 (meters) COMP
DF8771 NAD 83(2011) Y - -5,520,501.555 (meters) COMP
DF8771 NAD 83(2011) Z - 3,138,671.232 (meters) COMP
DF8771
DF8771 Network accuracy estimates per FGDC Geospatial Positioning Accuracy
DF8771 Standards:
DF8771 FGDC (95% conf, cm) Standard deviation (cm) CorrNE
DF8771 Horiz Ellip SD_N SD_E SD_h (unitless)
DF8771 -------------------------------------------------------------------
DF8771 NETWORK 0.21 0.59 0.07 0.10 0.30 0.02857700
DF8771 -------------------------------------------------------------------
DF8771
DF8771.The coordinates were established by GPS observations
DF8771.and adjusted by the National Geodetic Survey in June 2019.
DF8771
DF8771.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has
DF8771.been affixed to the stable North American Tectonic Plate.
DF8771
DF8771.The coordinates are valid at the epoch date displayed above
DF8771.which is a decimal equivalence of Year/Month/Day.
DF8771
DF8771.Due to the release of the International GNSS Service (IGS) 2014
DF8771.realization of the International Terrestrial Reference Frame of 2014
DF8771.(ITRF2014), NGS reprocessed all NOAA CORS Network and some IGS stations
DF8771.using data collected between 1/1/1996 and 1/30/2017. The resulting ITRF2014
DF8771.epoch 2010.00 coordinates, referred to as Multi-Year CORS Solution 2
DF8771.(MYCS2), were transformed to NAD 83 (2011/PA11/MA11) maintaining the
DF8771.currently published epoch of 2010.00.
DF8771
DF8771.Additional information on MYCS2 is available at
DF8771.https://geodesy.noaa.gov/CORS/news/mycs2/mycs2.shtml
DF8771
DF8771.** This station is in an area of suspected land subsidence, uplift, or
DF8771.** crustal motion. NGS recommends this and all published orthometric
DF8771.** heights in such areas be validated before use as vertical control.
DF8771.** Click here to see a list and map of nearby stations with valid
DF8771.** orthometric heights. Note: While datasheets are updated in real-time,
DF8771.** updates to archived datasheets and the SE TX Valid OH map occur
DF8771.** monthly. NGS discourages the use of scaled, VERTCON, or superseded
DF8771.** heights as vertical control as they are deemed unreliable.
DF8771.**
DF8771.** If an established orthometric height is unavailable in the survey control
DF8771.** section, it should be considered suspect. To view suspect heights,
DF8771.** (in the superseded section), select 'Include suspect heights in vertical
DF8771.** motion areas' box from the datasheet retrieval page.
DF8771
DF8771.Significant digits in the geoid height do not necessarily reflect accuracy.
DF8771.GEOID18 height accuracy estimate available here.
DF8771
DF8771.The PID for the CORS L1 Phase Center is DG4084.
DF8771
DF8771.Click photographs - Photos may exist for this station.
DF8771
DF8771.The XYZ, and position/ellipsoidal ht. are equivalent.
DF8771
DF8771.The ellipsoidal height was determined by GPS observations
DF8771.and is referenced to NAD 83.
DF8771
DF8771. The following values were computed from the NAD 83(2011) position.
DF8771
DF8771; North East Units Scale Factor Converg.
DF8771;SPC TXSC - 4,208,535.209 934,599.914 MT 0.99988032 +1 41 37.8
DF8771;SPC TXSC -13,807,502.60 3,066,266.55 sFT 0.99988032 +1 41 37.8
DF8771;UTM 15 - 3,284,960.266 253,924.127 MT 1.00034720 -1 15 33.3
DF8771
DF8771! - Elev Factor x Scale Factor = Combined Factor
DF8771!SPC TXSC - 1.00000077 x 0.99988032 = 0.99988109
DF8771!UTM 15 - 1.00000077 x 1.00034720 = 1.00034797
DF8771
DF8771_U.S. NATIONAL GRID SPATIAL ADDRESS: 15RTN5392484960(NAD 83)
DF8771
DF8771 SUPERSEDED SURVEY CONTROL
DF8771
DF8771 ELLIP H (06/27/12) -4.990 (m) GP(2010.00) 0 0
DF8771 NAD 83(2011)- 29 40 13.19496(N) 095 32 33.36095(W) AD(2010.00) c
DF8771 NAD 83(2011)- 29 40 13.19491(N) 095 32 33.36098(W) AD(2010.00) c
DF8771 ELLIP H (08/??/11) -4.980 (m) GP(2010.00) c c
DF8771 NAD 83(CORS)- 29 40 13.19495(N) 095 32 33.36128(W) AD(2002.00) c
DF8771 ELLIP H (01/??/06) -4.974 (m) GP(2002.00) c c
DF8771 NAD 83(CORS)- 29 40 13.19464(N) 095 32 33.36153(W) AD(2002.00) c
DF8771 ELLIP H (08/??/03) -4.919 (m) GP(2002.00) c c
DF8771
DF8771.Superseded values are not recommended for survey control.
DF8771
DF8771.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
DF8771.See file dsdata.pdf to determine how the superseded data were derived.
DF8771
DF8771_MARKER: STATION IS THE ANTENNA REFERENCE POINT OF THE GPS ANTENNA
DF8771
DF8771 STATION DESCRIPTION
DF8771
DF8771'DESCRIBED BY NATIONAL GEODETIC SURVEY 2019
DF8771'STATION IS PART OF THE NOAA CORS NETWORK. LATEST INFORMATION INCLUDING
DF8771'POSITIONS AND VELOCITIES ARE AVAILABLE IN THE COORDINATE AND LOG FILES
DF8771'ACCESSIBLE AT THE WORLDWIDE WEB.
DF8771'https://geodesy.noaa.gov/CORS/data.shtml
DF8771'https://geodesy.noaa.gov/CORS
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