Tools to help complete “Height Mod” Surveys OPUS & OPUS Projects Joe Evjen, Geodesist, NGS Height Modernization Eastern States Region Tuesday, March 04, 2014 Webinar
Jan 12, 2016
Tools to help complete “Height Mod” Surveys
OPUS & OPUS Projects
Joe Evjen, Geodesist, NGS Height Modernization Eastern States RegionalTuesday, March 04, 2014Webinar
options:projects & publishing
yoursolution
mark description
IGS & NGS base stations & site information filesIGS antenna calibrations & satellite orbits & reference framesUNAVCO teqc converterPAGES baseline processor var. geophysical modelsNGS geodetic toolkit
yourGPS data
standard geodetic data
OPUSOnline Positioning User Service
JGE 2013 v1free, fast, easy, consistent coordinates
geodesy.noaa.gov/OPUS
Static: OPUS determines your position with a differential GPS static solution, using hours of data.
This process is repeated 4x from other CORS.
baseline 1
baseline 3
baseline 4
baseline 2
baseline 5
NO BENCH MARKS … is this a height mod survey?
OPUS report
From: opus <[email protected]>
Subject: OPUS solution : nji20010.10o.txt OP1377187607298
NGS OPUS SOLUTION REPORT
========================
...
SOFTWARE: page5 1209.04 master43.pl 072313 START: 2010/01/01 00:00:00
EPHEMERIS: igs15645.eph [precise] STOP: 2010/01/01 01:59:00
NAV FILE: brdc0010.10n OBS USED: 5443 / 5579 : 98%
ANT NAME: 3S-02-TSATE NONE # FIXED AMB: 34 / 35 : 97%
ARP HEIGHT: 1.000 OVERALL RMS: 0.010(m)
REF FRAME: NAD_83(2011)(EPOCH:2010.0000) IGS08 (EPOCH:2010.0001)
X: 1319482.451(m) 0.002(m) 1319481.685(m) 0.002(m)
Y: -4656035.048(m) 0.004(m) -4656033.603(m) 0.004(m)
Z: 4140724.263(m) 0.005(m) 4140724.204(m) 0.005(m)
LAT: 40 44 29.30530 0.002(m) 40 44 29.33769 0.002(m)
E LON: 285 49 20.27369 0.002(m) 285 49 20.25908 0.002(m)
W LON: 74 10 39.72631 0.002(m) 74 10 39.74092 0.002(m)
EL HGT: 16.818(m) 0.006(m) 15.568(m) 0.006(m)
ORTHO HGT: 49.149(m) 0.016(m) [NAVD88 (Computed using GEOID12A)]
UTM COORDINATES STATE PLANE COORDINATES
UTM (Zone 18) SPC (2900 NJ ) ...
Northing (Y) [meters] 4510383.994 211890.690
Easting (X) [meters] 569426.410 177219.598
Convergence [degrees] 0.53669189 0.21034828
Point Scale 0.99965933 0.99990912
Combined Factor 0.99965669 0.99990648
US NATIONAL GRID DESIGNATOR: 18TWL6942610383(NAD 83)
BASE STATIONS USED
PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m)
DI3830 NJTP PISCATAWAY CORS ARP N403225.841 W0742804.135 33170.2
DI0616 NYQN QUEENS CORS ARP N404310.261 W0734348.266 37892.7
DH3768 NJMT NJMT CORS ARP N404747.350 W0742859.339 26502.5
NEAREST NGS PUBLISHED CONTROL POINT
AJ3348 NJ INST OF TECH 2 CORS ARP N404429.305 W0741039.726 0.0
OPUS uses GEOID12A to convert ellipsoid height to NAVD 88
How good is it?
DSWorld displays GEOID12A accuracy estimates
OPUS RULE OF THUMB:
1 σ = 4 cm
2 σ = 8 cm
Bad survey?bad marks?bad OPUS?
OPUS-projects: first, run OPUS to harvest all project data
OPUS automatically forms sessions from simultaneously observed marks, enabling multi-baseline processing and adjustment of redundant observations.
Why complicate OPUS?
2013-08-14 OPUS Projects 10
HATFIELD MCCOY
Observation Session Adjustment
OPUS solutions
Why complicate OPUS?
2013-08-14 OPUS Projects 11
session 001OPUS solutionsHATFIELD MCCOY
Observation Session Adjustment
Why complicate OPUS?
2013-08-14 OPUS Projects 12
session 002
session N
session 001OPUS solutionsHATFIELD MCCOY
Observation Session Adjustment
Why complicate OPUS?
2013-08-14 13
session 002
session N
session 001
network adjustment
OPUS solutionsHATFIELD MCCOY
Observation Session Adjustment
What’s all that really mean for me?OPUS solutions = pretty good, but each treated as
independent and assumes “perfect” CORS.Sessions = simultaneously-observed marks processed
together in sessions increases consistency. Adjustments = interlinking sessions through network
adjustments increases accuracy.
2013-08-14 OPUS Projects 14
OPUS Projects 15
geodesy.noaa.gov/OPUS is the access point for all things OPUS.
2013-08-14
NGS > OPUS
OPUS Projects 16
“Options” allows any user with your project id to add data.
2013-08-14
NGS > OPUS > options
NGS > OPUS > options > project ID > upload
mark description
… and a mark description.
OPUS Projects 18
the “Projects” link
2013-08-14
NGS > OPUS
OPUS Projects 19
… launches the OPUS Projects gateway page.
2013-08-14
NGS > OPUS > projects
Limitations?• Uploads through OPUS-Static.
– Dual-frequency.– 2 hrs ≤ data span ≤ 48 hrs (≤ 2 GPS midnights).– Observation interval = a factor of 30 (seconds).
• Minimum project size.– None
• Maximum project size.– There are practical limits to a project’s maximum size.
– About 100 marks in a single session.– Number of data files < a few hundred.
2013-08-07 Introduction 20
OPUS Projects 21
OPUS Projects TrainingBecause of its increased complexity, training is required to be an OPUS Projects manager. These workshops are usually two day in length and small so that there is ample time forone-on-one interaction with the instructor.
Check the NGS training center schedule for upcoming workshops run by NGS.
2013-08-14
Things To Come.OPUS Projects improves because your criticisms and suggestions. Although we can’t act upon every comment, we do appreciate and consider every one. They have and will continue to steered development.Here are a few things already in the works:•Allowing data files < 2 hrs in duration.•Better integration with CORS.•Better support for publishing to the NGSIDB.
2013-08-07 22Introduction
User guidein finaldevelopment