SabahPOS
Sabah Positioning Service · SLSD CORS Initiative
ReportSPOS-DD-2026301
Observation28 October 2026 · DOY 301/2026
Generated2026-10-30 02:29 UTC
StatusR&D · provisional

Daily Datum Realisation — QA/QC Report

Anchored ITRF2020 double-difference network solution tied to the Sabah Geocentric Datum 2020 (SGD2020), observation epoch 2026.8214.

QC PASSSolution accepted — all control stations mutually consistent and the tie RMS is within the few-millimetre intra-network target.
17
CORS control
4.0 mm
tie RMS
3.1 mm
median residual
8
IGS anchors fixed
—
external check
2026.821
epoch (ITRF2020)

1 Reference frame & methodology

Engine
Bernese GNSS Software 5.4, RNX2SNX ambiguity-fixed double-difference network, 30 s sampling.
Fiducials
8 IGS Reference Network (IGS20/ITRF2020) stations held fixed. A-priori coordinates propagated from the IGS20 realisation (reference epoch 2015.0) with station velocities and the ITRF2020 post-seismic deformation (PSD) model to the observation epoch.
Antenna
Absolute IGS ANTEX phase-centre models; antenna reference-point (ARP) eccentricities applied for every station.
Loading
Ocean-tide loading from station-specific coefficients (SPOTL / TPXO7.2).
Products
CODE multi-GNSS rapid orbits, clocks, Earth-rotation and code biases; CODE global ionosphere maps. Provisional — this day will be re-solved on the final products once CODE publishes them (typically 9–10 days after observation) and the coordinates below refreshed.
Datum tie
Robust 3-parameter (translation-only) transformation ITRF2020(t)→SGD2020 estimated against the published permanent-CORS control. Translation T = (+144.2, +16.4, +68.3) mm.

2 Quality & external accuracy

Tie RMS 4.0 mm is the scatter of the 17 retained CORS about the fitted SGD2020 control (internal consistency). Kept-station residuals: median 3.1 mm, maximum 7.1 mm.

Kept-CORS residual distribution (mm)30-292-434-626-88-1010-1212+

No check anchors were withheld this session, so no independent external-accuracy figure is reported. Run with check anchors to obtain one (diagnostic only — it never gates the solution).

3 Station map

kept (control) monitored (not control) no data anchor (fixed)

OpenStreetMap base · scroll to zoom, drag to pan, click a station for detail.
Circles = CORS, diamonds = IGS anchors.

4 Station disposition & QC

Automatic gates: cycle-slip (>1% loss-of-lock), thin data (<80% of the day), robust residual reject (>40 mm, MAD-based), anchor leave-one-out, and an a-priori gross-error gate.

Sabah CORS — estimated control

CORSStatusLatitudeLongitudeResidual / note
BL08kept (control)5.89443117.560202.8 mm
KB03kept (control)6.35118116.431823.9 mm
KD05kept (control)6.88165116.853334.6 mm
KG13kept (control)5.34215116.159013.1 mm
KK01kept (control)5.95923116.070292.1 mm
KM22kept (control)6.49988116.772462.8 mm
KN09kept (control)5.58762117.847135.3 mm
KP18kept (control)5.57213115.599490.8 mm
NB15kept (control)5.04526116.436433.2 mm
PT23kept (control)6.70681117.029792.7 mm
RN06kept (control)5.95565116.670121.4 mm
SE12kept (control)4.47876118.612713.8 mm
SK07kept (control)5.87749118.054016.8 mm
SP19kept (control)5.08000115.551021.2 mm
TB14kept (control)5.66757116.362497.1 mm
TG25kept (control)5.27162116.975395.9 mm
TW10kept (control)4.24668117.880272.9 mm
LD11monitored (not control)5.02904118.3160818.8 mm (not control)
TL27no data5.62983117.12914no usable data

IGS fiducials

AnchorStatusLatitudeLongitudeResidual / note
CIBGanchor (fixed)-6.49037106.84918—
CMUManchor (fixed)18.7608898.93238—
CUSVanchor (fixed)13.73591100.53392—
DARWanchor (fixed)-12.84369131.13275—
GUAManchor (fixed)13.58933144.86836—
JOG2anchor (fixed)-7.76382110.37247—
PIMOanchor (fixed)14.63572121.07773—
XMISanchor (fixed)-10.44996105.68851—

5 Published SGD2020 coordinates

ECEF Cartesian (m) — 17 retained CORS

StationITRF2020 (observation epoch)SGD2020
XYZXYZ
BL08-2935567.84575624735.1129650652.5201-2935567.70155624735.1294650652.5884
KB03-2821849.16325676659.3610700878.6593-2821849.01905676659.3774700878.7276
KD05-2860468.73495649692.6686759149.6810-2860468.59075649692.6850759149.7492
KG13-2799918.94265700477.0821589899.5461-2799918.79845700477.0985589899.6144
KK01-2788004.72205698503.9312657780.8201-2788004.57785698503.9477657780.8884
KM22-2854706.90435658114.3005717217.4633-2854706.76015658114.3169717217.5316
KN09-2965300.94055612996.4726616897.5897-2965300.79625612996.4890616897.6580
KP18-2742938.85865725086.7509615188.2906-2742938.71445725086.7673615188.3589
NB15-2828878.62895689652.4835557215.7341-2828878.48475689652.5000557215.8023
PT23-2878899.06605642901.8691739951.2948-2878898.92185642901.8855739951.3630
RN06-2847754.21785669492.4841657440.2730-2847754.07365669492.5005657440.3413
SE12-3045175.18135582299.1063494747.5423-3045175.03715582299.1227494747.6106
SK07-2984042.36735599427.8919648792.5694-2984042.22315599427.9084648792.6376
SP19-2740277.72865731969.6395561001.5569-2740277.58445731969.6560561001.6252
TB14-2818727.78965687637.6286625748.6242-2818727.64545687637.6450625748.6924
TG25-2881081.42445660450.6780582113.5640-2881081.28025660450.6944582113.6322
TW10-2974477.02335622490.2272469157.3401-2974476.87915622490.2437469157.4083

Geographic & projected — SGD2020

StationLatitude (°)Longitude (°)Ellip. h (m)Ortho H (m)Geoc. RSO E (m)Geoc. RSO N (m)
BL085.89443139117.5602036860.6247.2788873347.7735653778.354
KB036.35117795116.4318222694.35144.8138748156.8985703520.970
KD056.88164851116.8533291968.10218.3378794451.6475762438.141
KG135.34214522116.15901120366.827317.1998718500.0265591796.937
KK015.95922879116.0702853068.73920.3998708351.9505659984.130
KM226.49988332116.7724626866.20015.5158785750.8005720168.104
KN095.58762464117.8471326496.75943.0478905373.1965620089.723
KP185.57213084115.5994850855.4239.5848656390.0515616957.191
NB155.04526222116.43642979521.235469.8168749415.4295559126.042
PT236.70681277117.0297915477.38425.9768814072.4055743218.177
RN065.95565341116.67012008576.743524.1838774763.3165659924.890
SE124.47876237118.6127109574.29613.7108991276.6375498163.792
SK075.87748945118.0540070097.05043.1488928033.9435652317.874
SP195.07999657115.5510223863.47116.5698651232.1355562518.812
TB145.66757234116.36248498628.367577.0418740866.1235627890.283
TG255.27162395116.97538551144.22391.1388809018.4665584491.027
TW104.24668003117.8802698668.18010.4588910166.0895471836.762

Geographic on the GRS80 ellipsoid; orthometric height via MyGeoid/GDM2000. Geocentric RSO = RSO Borneo (Hotine oblique Mercator) on GRS80 applied to the SGD2020 coordinates, false easting 8 000 000 m, false northing 5 000 000 m.

6 Caveats