Common Marks

Datasheet Basics The NGS Data Sheet See file dsdata.txt for more information about the datasheet. DATABASE = Sybase,PROGRAM = datasheet, VERSION = National Geodetic Survey, Retrieval Date = NOVEMBER 20, 2007 AE8289 *********************************************************************** AE8289 CBN - This is a Cooperative Base Network Control Station. AE8289 TIDAL BM - This is a Tidal Bench Mark. AE8289 DESIGNATION AE8289 PID - AE8289 AE8289 STATE/COUNTY- MN/ST LOUIS AE8289 USGS QUAD - DULUTH (1993) AE8289 AE8289 *CURRENT SURVEY CONTROL AE8289 ___________________________________________________________________ AE8289* NAD 83(2007) (N) (W) ADJUSTED AE8289* NAVD (meters) (feet) ADJUSTED AE8289 ___________________________________________________________________ AE8289 EPOCH DATE AE8289 X , (meters) COMP AE8289 Y - -4,373, (meters) COMP AE8289 Z - 4,624, (meters) COMP AE8289 LAPLACE CORR (seconds) DEFLEC99 AE8289 ELLIP HEIGHT (meters) (02/10/07) ADJUSTED AE8289 GEOID HEIGHT (meters) GEOID03 AE8289 DYNAMIC HT (meters) (feet) COMP AE8289 AE Accuracy Estimates (at 95% Confidence Level in cm) AE8289 Type PID Designation North East Ellip AE AE8289 NETWORK AE AE AE8289 MODELED GRAV- 980,748.1 (mgal) NAVD 88 AE8289 AE8289 VERT ORDER - FIRST CLASS II AE8289 AE8289.The horizontal coordinates were established by GPS observations AE8289.and adjusted by the National Geodetic Survey in February what's on a datasheet –Position –Accuracy –How to locate and identify help files (dsdata.txt, glossary, …)

online positioning user service OPUS / your position your GPS data IERS geophysical models IGS satellite orbits ITRF reference frames NGS antenna calibrations NGS CORS base stations NGS geodetic toolkit NGS site information files UNAVCO teqc conversion (optional) publish in NGS database calibrated antenna type mark info (optional) JGE 2008v3 geodetic data

Integration of OPUS outputs

FILE: corv o NOTE: Antenna offsets supplied by the user were zero. Coordinates 1008 returned will be for the antenna reference point (ARP) NGS OPUS SOLUTION REPORT ======================== USER: DATE: January 13, 2006 RINEX FILE: corv059f.05o TIME: 19:08:14 UTC SOFTWARE: page master3.pl START: 2005/02/28 05:00:00 EPHEMERIS: igs13121.eph [precise] STOP: 2005/02/28 06:59:30 NAV FILE: brdc n OBS USED: 4228 / 4314 : 98% ANT NAME: ASH700936B_M NONE # FIXED AMB: 25 / 29 : 86% ARP HEIGHT: 0.0 OVERALL RMS: 0.013(m) REF FRAME: NAD_83(CORS96)(EPOCH: ) ITRF00 (EPOCH: ) X: (m) 0.018(m) (m) 0.018(m) Y: (m) 0.021(m) (m) 0.021(m) Z: (m) 0.024(m) (m) 0.024(m) LAT: (m) (m) E LON: (m) (m) W LON: (m) (m) EL HGT: (m) 0.034(m) (m) 0.034(m) ORTHO HGT: (m) 0.043(m) [Geoid03 NAVD88] UTM COORDINATES STATE PLANE COORDINATES UTM (Zone 10) SPC (3601 OR N) Northing (Y) [meters] Easting (X) [meters] Convergence [degrees] Point Scale Combined Factor US NATIONAL GRID DESIGNATOR: 10TDQ (NAD 83) BASE STATIONS USED PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m) AH2489 NEWP NEWPORT CORS ARP N W AJ6959 CHZZ CAPE MEARS CORS ARP N W DH4503 P376 EOLARESVR_OR2004 CORS ARP N W NEAREST NGS PUBLISHED CONTROL POINT AH2486 CORVALLIS CORS ARP N W OPUS Output - Standard FILE: corv o NOTE: Antenna offsets supplied by the user were zero. Coordinates 1008 returned will be for the antenna reference point (ARP) NGS OPUS SOLUTION REPORT ======================== USER: DATE: January 13, 2006 RINEX FILE: corv059f.05o TIME: 19:08:14 UTC SOFTWARE: page master3.pl START: 2005/02/28 05:00:00 EPHEMERIS: igs13121.eph [precise] STOP: 2005/02/28 06:59:30 NAV FILE: brdc n OBS USED: 4228 / 4314 : 98% ANT NAME: ASH700936B_M NONE # FIXED AMB: 25 / 29 : 86% ARP HEIGHT: 0.0 OVERALL RMS: 0.013(m) REF FRAME: NAD_83(CORS96)(EPOCH: ) ITRF00 (EPOCH: ) X: (m) 0.018(m) (m) 0.018(m) Y: (m) 0.021(m) (m) 0.021(m) Z: (m) 0.024(m) (m) 0.024(m) LAT: (m) (m) E LON: (m) (m) W LON: (m) (m) EL HGT: (m) 0.034(m) (m) 0.034(m) ORTHO HGT: (m) 0.043(m) [Geoid03 NAVD88] UTM COORDINATES STATE PLANE COORDINATES UTM (Zone 10) SPC (3601 OR N) Northing (Y) [meters] Easting (X) [meters] Convergence [degrees] Point Scale Combined Factor US NATIONAL GRID DESIGNATOR: 10TDQ (NAD 83) BASE STATIONS USED PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m) AH2489 NEWP NEWPORT CORS ARP N W AJ6959 CHZZ CAPE MEARS CORS ARP N W DH4503 P376 EOLARESVR_OR2004 CORS ARP N W NEAREST NGS PUBLISHED CONTROL POINT AH2486 CORVALLIS CORS ARP N W February 19, :16:22 UTC zzyy o page master3.pl igs14293.eph [precise] brdc n TRM NONE /05/30 00:00: /05/30 23:59: NAD_83(CORS96) m m m ITRF00 (EPOCH: ) m m m <PLANE_COORD_SPEC TYPE="SPC" ZONE="4204(TXSC )"> RTP (NAD 83) DE5999 ADKS ADDICKS 1795 CORS ARP N W DJ8995 ROD1 ROD1 CORS ARP N W DH3612 TXLI LIBERTY CORS ARP N W AA9861 LAKE HOUSTON 2050 CORS L1 PHS N W This position and the above vector components were computed without any knowledge by the National Geodetic Survey regarding the equiqment or field operating procedure used. OPUS Output - XML Example

Output options + extended report + XML report + select state plane Share options + add to database + add to campaign Input options + set user profile + select CORS + select software

DEFAULTS: hours of data no archive no delimiters US only one receiver $$$ receiver GPS only OPUSOPUS in the works minutes minutes of data share share results delimited delimited results global global results multiple * multiple receivers ¢¢ * ¢¢ receivers GNSS * GNSS signals *  heights Operational components are available at * Prototype components are available at

online positioning user service OPUS / your position your GPS data IERS geophysical models IGS satellite orbits ITRF reference frames NGS antenna calibrations NGS CORS base stations NGS geodetic toolkit NGS site information files UNAVCO teqc conversion (optional) publish in NGS database calibrated antenna type mark info (optional) JGE 2008v3 geodetic data

Web Services

OPUS What is it? How does it work? –input –output –options Why is it useful? –applications

CORS solution 1 solution 3 solution 2 Static: OPUS determines your position with a differential GPS static solution, using hours of data. This process is repeated twice from other CORS.

Rapid-static: OPUS first creates an atmospheric delay model from surrounding CORS data. Your position is then quickly determined by differential GPS static solution.

 CORS solution 1 solution 2 your peak-to-peaks: scaled from the spread of the 3 CORS solutions solution 3 your position: averaged from the 3 CORS solutions h

North = 3.86 cm East = 5.08 cm W Ellip ht = 1.57 cm Ortho ht = 2.66 cm (N) (W) (meters) Geodetic control accuracy: 95% confidence interval

OPUS static vs. rapid static staticrapid static input (dual-frequency GPS) 2-48 hours15 minutes-4 hours output normal, extended, XML datasheet, project normal, extended, XML accuracy (95%confidence) 1-2 cm horizontal 3-6 cm ellipsoidal height 1-2 cm horizontal 4-8 cm ellipsoidal height network geometry 3 CORS, preferably within 1000 km of rover 3-9 CORS, surrounding & within 250 km of rover availability global (when authorized) 90% of CONUS (subject to CORS configuration)

Comparison of OPUS accuracies OPUS and OPUS-RS combined Time, distance, accuracy

Positioning Error vs. Duration of the Observing Session

Positioning Accuracy with Code Data red = east-west blue = north-south Observation Time = 1 minute RMS error = 25 cm + 2 ppm

Antenna height and type Graphic explaining why

HOW IS THE ANTENNA HEIGHT MEASURED? ARP MARK The height is measured vertically (NOT the slant height) from the mark to the ARP of the antenna. The height is measured in meters. The ARP is almost always the center of the bottom-most, permanently attached, surface of the antenna. See GPS Antenna Calibration for photo’s and diagrams that show where the ARP is on most antennas: / If the default height of is entered, OPUS will return the position of the ARP.

WHY DO I NEED THE ANTENNA TYPE? The antenna phase centers are located somewhere around here. The Antenna Reference Point (ARP) is almost always located in the center of the bottom surface of the antenna. The antenna offsets are the distance between the phase centers and the ARP You do not need to know these offsets. They are passed to the processing software through the antenna type Incorrect or missing antenna type  big vertical errors ARP phase ctr.

Stable Permanent Unique Recoverable Safe Z |-- mark fundamentals

NGS-modeled antenna OPUS your position datasheet antenna type, antenna height your GNSS data NGS data CORS data IGS orbits geophysical models GNSS software geodetic toolkit

North = 0.86 cm East = 0.69 cm W Ellip ht = ± 1.45 cm Ortho ht = ± 2.66 cm (N) (W) (meters)