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RTK on Bench Marks

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(@loyal)
Posts: 3735
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As part of the same project referenced in the "RTK of PLSS Section" thread, 'we' also RTL'd 18 Second Order Bench Marks that run through the Project. The Bench Marks are roughly 1 mile apart (range from ~4500 to ~7600 feet as the buzzard flies). Each was shot ONCE (3 minute 180 epoch solution). RTK vectors (BASE to ROVER) range from a couple thousand feet, to over 4 miles (although MOST are under 2.5 Miles).

GEOID12A derived NAVD88 heights were "adjusted" DOWN 0.265 feet in all cases, in order to FIT the local realization of NAVD88 in the area, as per the NGS Data Sheets (NAVD88 Heights) on the first 11 Bench Marks. Two of the Listed Bench Marks were also part of the Primary Control Network (OPUS Projects), and all RTK Base Stations used were part of the Primary Network.


USGS BM RTK ________4244.415
USGS BM NGS Record 4244.391
______________________+0.024

USGS BM RTK ________4247.915
USGS BM NGS Record 4247.941
______________________-0.026

USGS BM RTK ________4240.743
USGS BM NGS Record 4240.733
______________________+0.010

USGS BM RTK ________4251.488
USGS BM NGS Record 4251.494
______________________-0.006

USGS BM RTK ________4249.914
USGS BM NGS Record 4249.926
______________________-0.012

USGS BM RTK ________4279.736
USGS BM NGS Record 4279.788
______________________-0.052

USGS BM RTK ________4259.992
USGS BM NGS Record 4259.988
______________________+0.004

USGS BM Static _____4260.990
USGS BM NGS Record 4260.976
______________________+0.014

USGS BM RTK ________4260.996
USGS BM NGS Record 4260.976
______________________+0.020

USGS BM RTK ________4241.925
USGS BM NGS Record 4241.891
______________________+0.034

USGS BM RTK ________4332.853
USGS BM NGS Record 4332.862
______________________-0.009

USGS BM RTK ________4406.101
USGS BM NGS Record 4406.080
______________________+0.021

USGS BM RTK ________4380.363 DISTURBED*
USGS BM NGS Record 4380.214
______________________+0.149

USGS BM RTK ________4274.710
USGS BM NGS Record 4274.690
______________________+0.020

USGS BM RTK ________4296.816
USGS BM NGS Record 4296.747
______________________+0.069

USGS BM RTK ________4309.569
USGS BM NGS Record 4309.545
______________________+0.024

USGS BM RTK ________4248.998
USGS BM NGS Record 4249.011
______________________-0.013

USGS BM STATIC _____4290.176
USGS BM NGS Record 4290.126
______________________+0.050

Loyal

 
Posted : December 6, 2015 7:02 pm
(@jim-frame)
Posts: 7277
 

Nice fit.

 
Posted : December 6, 2015 7:56 pm
(@mightymoe)
Posts: 9920
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Thanks for the data, it's interesting to see a DOWN adjustment.

I'm generally seeing an UP adjustment of about .15'.

 
Posted : December 6, 2015 10:19 pm
(@ekillo)
Posts: 559
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MightyMoe, post: 347687, member: 700 wrote: Thanks for the data, it's interesting to see a DOWN adjustment.

I'm generally seeing an UP adjustment of about .15'.

Same here.

 
Posted : December 7, 2015 12:45 am