DPOS with AusCORS (Australia) - Base coordinates ~60mm out

Danb

New Member
Hi,

I've tested the DPOS processing here in Australia, and have consistently been getting differing coordinates when checking to Permanent Survey Marks by ~20mm in Easting and ~50mm in Northing. When checking the DPOS report I noticed that the values used for base stations differed to the published coordinates by the same amount (see table below). What is causing this? is there a rounding issue when converting between Cartesian / Lat,Longs / Projected coordinates????

1545193498075.png


Link to folder with DPOS report, JPS file and Published coordinates can be found here - https://drive.google.com/open?id=1auKDct4aNQqJAYZ3pV38qQf9WY1Q7iyk

Can anyone shed any light on what's happening? and how to get correct results from DPOS?

Cheers,
Dan
 

ABoikov

New Member
5PLS
Hi, Dan.

Justin/DPOS use reference points coordinates published in ftp://ftp.ga.gov.au/geodesy-outgoing/gnss/solutions/final/weekly/ for 06/09/2017.

If you want to use the recent coordinates or coordinates from another catalogue, you can edit the coordinates of the reference points in Justin.
Unfortunatelly, I can not find the Survey Control Mark Reports you sent. Could you share the address?

Best regards,
Alexander Boikov.
 

Danb

New Member
Thanks for the response Alexander,

Here are the links to the Survey Control mark reports:

TOOG - http://qspatial.information.qld.gov.au/SurveyReport/SCR753324.pdf
CBLT - http://qspatial.information.qld.gov.au/SurveyReport/SCR753292.pdf
BEE2 - http://qspatial.information.qld.gov.au/SurveyReport/SCR753165.pdf
GATT - http://qspatial.information.qld.gov.au/SurveyReport/SCR753323.pdf
TOOW - http://qspatial.information.qld.gov.au/SurveyReport/SCR753327.pdf

When you say that we can edit the coordinates of reference points in Justin - can this be done in Justin Viewer using the downloaded JPR file from the DPOS page at https://app.javad.com/jca ???

Below is a shortened version of the DPOS report with the reference mark names and coordinates highlighted red.

Cheers,
Dan




DPOS REPORT
JAVAD POST-PROCESSING SERVICE
=============================

USER: DATE: 19.12.2018
FILE: 2018-9999_001_001 TIME: 03:38:40.313 GPS time

SOFTWARE: DPOS(5/29/2018 9:09:56 AM) START: 2018/06/26 01:36:20.000 AM
EPHEMERIS: brdc STOP: 2018/06/26 02:36:15.000 AM
OBS USED: 3676 / 3682 TIME SPAN: 60 min
ANT NAME: JAV_TRIUMPH-1 NONE Geometry factor: 1.0
ANT HEIGHT: Slant(SHMP) - 1.882 meters FIXED AMB: Yes
ANT DELTA N/E/H: 0.000/0.000/0.000 OVERALL RMS: 0.009 meters

REF FRAME: GDA94 / MGA zone 56 - 150-156° E WGS84
X: -5029282.284(m) 0.005(m) -5029282.284(m) 0.005(m)
Y: 2590909.565(m) 0.005(m) 2590909.565(m) 0.005(m)
Z: -2935466.699(m) 0.005(m) -2935466.699(m) 0.005(m)
LAT: S 27°34'51.786668" 0.005(m) -27.581051852 0.005(m)
LON: E 152°44'38.640585" 0.005(m) 152.744066829 0.005(m)
EL HGT: 70.4888(m) 0.005(m) 70.4888(m) 0.005(m)
ORTHO HGT: 28.936(m) 0.005(m) [Geoid/ausgeoid09.db3]
Northing 6949177.809(m)
Easting 474738.747(m)

BASE STATIONS USED
NAME X Y Z DISTANCE(m)
BEE2(AUSCORS) -5043446.857 2547349.090 -2949130.403 47800.1
CBLT(AUSCORS) -5061145.123 2584178.559 -2886585.700 58735.8
GATT(AUSCORS) -5012219.119 2628002.484 -2931852.008 40989.1
TOOG(AUSCORS) -5034627.783 2635798.385 -2886526.948 66623.4
TOOW(AUSCORS) -4994482.417 2663618.022 -2931171.266 80721.8
Solution name: TOOW - 2018-9999_001_001 / Solution 1
Processed at: 12/19/2018 3:38:36 AM
Begin time: 26/06/2018 01:36:20.000
End time: 26/06/2018 02:36:15.000
Time span, min: 60
Rec interval, sec: 30.000
Ephemeris: Broadcast
Cut off аngle,°: 12
Processing mode: Auto
Frequency: L1 + L2
Used satellites: GPS(12)/GLONASS(10)
Solution type: Fixed
Temperature, °C: 20
Pressure, hPa: 980
Humidity, %: 50
Used observations: L1, L2, P1, P2

--------------------------------------------------------------------------------
Begin point End point
--------------------------------------------------------------------------------
Point name: TOOW 2018-9999_001_001
Northing, m: 6953910.2817 6949177.7984
Easting, m: 394189.9545 474738.7482
Ellipsoid height, m: 643.3635 28.9980
X, m: -4994482.4170 -5029282.3294
Y, m: 2663618.0220 2590909.5868
Z, m: -2931171.2660 -2935466.7371
--------------------------------------------------------------------------------
Begin point End point
--------------------------------------------------------------------------------
Point name: TOOG 2018-9999_001_001
Northing, m: 7004176.3713 6949177.8065
Easting, m: 437184.0632 474738.7517
Ellipsoid height, m: 150.1216 28.9422
X, m: -5034627.7830 -5029282.2903
Y, m: 2635798.3850 2590909.5627
Z, m: -2886526.9480 -2935466.7041
--------------------------------------------------------------------------------
Begin point End point
--------------------------------------------------------------------------------
Point name: GATT 2018-9999_001_001
Northing, m: 6953137.9259 6949177.8079
Easting, m: 433957.4592 474738.7460
Ellipsoid height, m: 98.6823 28.9553
X, m: -5012219.1190 -5029282.2987
Y, m: 2628002.4840 2590909.5734
Z, m: -2931852.0080 -2935466.7089
--------------------------------------------------------------------------------
Begin point End point
--------------------------------------------------------------------------------
Point name: CBLT 2018-9999_001_001
Northing, m: 7004211.5725 6949177.8056
Easting, m: 495193.2653 474738.7454
Ellipsoid height, m: 40.9699 28.9281
X, m: -5061145.1230 -5029282.2760
Y, m: 2584178.5590 2590909.5624
Z, m: -2886585.7000 -2935466.6984
--------------------------------------------------------------------------------
Begin point End point
--------------------------------------------------------------------------------
Point name: BEE2 2018-9999_001_001
Northing, m: 6933760.1790 6949177.8136
Easting, m: 519963.6483 474738.7460
Ellipsoid height, m: 13.6362 28.9127
X, m: -5043446.8570 -5029282.2675
Y, m: 2547349.0900 2590909.5573
Z, m: -2949130.4030 -2935466.6842
--------------------------------------------------------------------------------
 

ABoikov

New Member
5PLS
Dan,

editing of reference points coordinates can be done with Justin. (Justin Viewer(Link)) can not reprocess data and readjust network.

Unfortunately, Queensland Globe site does not provide machine readable format of coordinates list.

Best regards,
Alexander Boikov.
 
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