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 <opus@ngs.noaa.gov>

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