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 20, 2025 01:23:07 EST
DF8777 ***********************************************************************
DF8777 HT_MOD - This is a Height Modernization Survey Station.
DF8777 CORS - This is a GPS Continuously Operating Reference Station.
DF8777 DESIGNATION - HOUSTON 4 COOP CORS ARP
DF8777 CORS_ID - COH4
DF8777 PID - DF8777
DF8777 STATE/COUNTY- TX/HARRIS
DF8777 COUNTRY - US
DF8777 USGS QUAD - JACINTO CITY (2019)
DF8777
DF8777 *CURRENT SURVEY CONTROL
DF8777 ______________________________________________________________________
DF8777* NAD 83(2011) POSITION- 29 46 59.38835(N) 095 12 54.57176(W) ADJUSTED
DF8777* NAD 83(2011) ELLIP HT- -17.328 (meters) (06/??/19) ADJUSTED
DF8777* NAD 83(2011) EPOCH - 2010.00
DF8777* NAVD 88 ORTHO HEIGHT - **(meters) **(feet) NOT PUB
DF8777 **This station is in an area of suspected vertical motion (see below).
DF8777 ______________________________________________________________________
DF8777 NAVD 88 orthometric height was determined with geoid model GEOID09
DF8777 GEOID HEIGHT - -27.315 (meters) GEOID09
DF8777 GEOID HEIGHT - -27.294 (meters) GEOID18
DF8777 NAD 83(2011) X - -503,584.205 (meters) COMP
DF8777 NAD 83(2011) Y - -5,517,286.036 (meters) COMP
DF8777 NAD 83(2011) Z - 3,149,526.245 (meters) COMP
DF8777
DF8777.Formal positional accuracy estimates are not available for this CORS
DF8777.because its coordinates were determined in part using modeled
DF8777.velocities. Approximate one-sigma accuracies for latitude, longitude,
DF8777.and ellipsoid height can be obtained from the short-term time series.
DF8777.Additional information regarding modeled velocities is available on
DF8777.the CORS Coordinates for MYCS2 web page:
DF8777.https://www.ngs.noaa.gov/CORS/news/mycs2/mycs2.shtml.
DF8777
DF8777.The coordinates were established by GPS observations
DF8777.and adjusted by the National Geodetic Survey in June 2019.
DF8777
DF8777.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has
DF8777.been affixed to the stable North American Tectonic Plate.
DF8777
DF8777.The coordinates are valid at the epoch date displayed above
DF8777.which is a decimal equivalence of Year/Month/Day.
DF8777
DF8777.Due to the release of the International GNSS Service (IGS) 2014
DF8777.realization of the International Terrestrial Reference Frame of 2014
DF8777.(ITRF2014), NGS reprocessed all NOAA CORS Network and some IGS stations
DF8777.using data collected between 1/1/1996 and 1/30/2017. The resulting ITRF2014
DF8777.epoch 2010.00 coordinates, referred to as Multi-Year CORS Solution 2
DF8777.(MYCS2), were transformed to NAD 83 (2011/PA11/MA11) maintaining the
DF8777.currently published epoch of 2010.00.
DF8777
DF8777.Additional information on MYCS2 is available at
DF8777.https://geodesy.noaa.gov/CORS/news/mycs2/mycs2.shtml
DF8777
DF8777.** This station is in an area of suspected land subsidence, uplift, or
DF8777.** crustal motion. NGS recommends this and all published orthometric
DF8777.** heights in such areas be validated before use as vertical control.
DF8777.** Click here to see a list and map of nearby stations with valid
DF8777.** orthometric heights. Note: While datasheets are updated in real-time,
DF8777.** updates to archived datasheets and the SE TX Valid OH map occur
DF8777.** monthly. NGS discourages the use of scaled, VERTCON, or superseded
DF8777.** heights as vertical control as they are deemed unreliable.
DF8777.**
DF8777.** If an established orthometric height is unavailable in the survey control
DF8777.** section, it should be considered suspect. To view suspect heights,
DF8777.** (in the superseded section), select 'Include suspect heights in vertical
DF8777.** motion areas' box from the datasheet retrieval page.
DF8777
DF8777.Significant digits in the geoid height do not necessarily reflect accuracy.
DF8777.GEOID18 height accuracy estimate available here.
DF8777
DF8777.The PID for the CORS L1 Phase Center is DG4087.
DF8777
DF8777.Click photographs - Photos may exist for this station.
DF8777
DF8777.The XYZ, and position/ellipsoidal ht. are equivalent.
DF8777
DF8777.The ellipsoidal height was determined by GPS observations
DF8777.and is referenced to NAD 83.
DF8777
DF8777. The following values were computed from the NAD 83(2011) position.
DF8777
DF8777; North East Units Scale Factor Converg.
DF8777;SPC TXSC - 4,222,015.532 965,873.782 MT 0.99989374 +1 51 15.3
DF8777;SPC TXSC -13,851,729.29 3,168,870.90 sFT 0.99989374 +1 51 15.3
DF8777;UTM 15 - 3,296,815.299 285,862.900 MT 1.00016580 -1 06 02.6
DF8777
DF8777! - Elev Factor x Scale Factor = Combined Factor
DF8777!SPC TXSC - 1.00000272 x 0.99989374 = 0.99989646
DF8777!UTM 15 - 1.00000272 x 1.00016580 = 1.00016852
DF8777
DF8777_U.S. NATIONAL GRID SPATIAL ADDRESS: 15RTN8586296815(NAD 83)
DF8777
DF8777 SUPERSEDED SURVEY CONTROL
DF8777
DF8777 ELLIP H (06/27/12) -17.333 (m) GP(2010.00) 0 0
DF8777 NAD 83(2011)- 29 46 59.38849(N) 095 12 54.57168(W) AD(2010.00) c
DF8777 NAD 83(2011)- 29 46 59.38833(N) 095 12 54.57175(W) AD(2010.00) c
DF8777 ELLIP H (08/??/11) -17.332 (m) GP(2010.00) c c
DF8777 NAD 83(CORS)- 29 46 59.38820(N) 095 12 54.57198(W) AD(2002.00) c
DF8777 ELLIP H (01/??/06) -17.351 (m) GP(2002.00) c c
DF8777 NAD 83(CORS)- 29 46 59.38814(N) 095 12 54.57221(W) AD(2002.00) c
DF8777 ELLIP H (08/??/03) -17.340 (m) GP(2002.00) c c
DF8777
DF8777.Superseded values are not recommended for survey control.
DF8777
DF8777.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
DF8777.See file dsdata.pdf to determine how the superseded data were derived.
DF8777
DF8777_MARKER: STATION IS THE ANTENNA REFERENCE POINT OF THE GPS ANTENNA
DF8777
DF8777 STATION DESCRIPTION
DF8777
DF8777'DESCRIBED BY NATIONAL GEODETIC SURVEY 2019
DF8777'STATION IS PART OF THE NOAA CORS NETWORK. LATEST INFORMATION INCLUDING
DF8777'POSITIONS AND VELOCITIES ARE AVAILABLE IN THE COORDINATE AND LOG FILES
DF8777'ACCESSIBLE AT THE WORLDWIDE WEB.
DF8777'https://geodesy.noaa.gov/CORS/data.shtml
DF8777'https://geodesy.noaa.gov/CORS
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