OPUS & Trimble R8

Summarize Topic

Strictly Surveying

Last Post by paul-in-pa 14 years ago

4 Posts

4 Users

0 Reactions

1,255 Views

RSS

SIR VEYSALOT

(@sir-veysalot)

Posts: 657

Free

Topic starter

Translate ▼

Having a problem with an OPUS using a Trimble R8 and Survey controller. We were collecting a fast static 1 1/2 hour occupation on a control point in the northern panhandle of WV. While collecting static, we also gathered a few RTK points using the HERE function to assign coordinates to the control point. When we got back to the office, the HERE values and the OPUS values were only a few feet apart but they were both located in the county of INDIANA PA. Whats more, the OPUS report listed WV North as the location but yet the SPC ends up in iNDIANA PA. Does the OPUS report disply the zone based on the controller value or does it automatically determine the zone based on the RINEX? The controller zone was set to WV North. The base was in wide open area but the RMS was .31 and the observations used was only 0.79%. I thought the OPUS value was independent of the settings in the DC? It's probably something simple. WHAT AM I MISSING?

Posted : November 6, 2012 7:02 pm

Bryan Newsome

(@bryan-newsome)

Posts: 427

Free

Translate ▼

I ran a fast static yesterday w/ my R8 (model 1) and TSC2 controller.
OPUS-S w/ a 2 hour 33 min observation. Processed it this morning (too soon-therefore ultra rapid orbit used), I was impatient. I will resubmit it tomorrow or later. I had no problems.
OPUS reads your file and processes it against the local CORS sites in your area. It does not read the internal file parameters such as projection, antennae height, etc.
Not to insinuate anything, but are you looking at "first page SPCs" (meters) or "last page SPCs" (US survey feet)?
I was confused about your statement of collecting RTK while collecting static. Were you running a static base and RTK-Infill rover?

Posted : November 6, 2012 9:28 pm

Hillbilly Leg

(@hillbilly-leg)

Posts: 68

Free

Translate ▼

Why don't you convert the OPUS nad83 lat & long to the SPC zone you need using some other utility, just to check? You could also put the lat & long into Google maps to see that the base was about where you think it was.

Posted : November 7, 2012 6:24 am

paul-in-pa

(@paul-in-pa)

Posts: 6034

Free

Translate ▼

Re-explain Your Problem

Fist, Indiana County is quite a ways from West Virginia.

Where exactly are you getting this location information from?

Also you can request the SPC zone when you submit to OPUS. Be aware that OPUS can remember what you last requested and use it as a current default.

I surmise your GPS software settings are off.

I suggest you do as I do. I only input my OPUS results in my GPS software as Lat, Lon and Elliptical height. Then I change my GPS software settings to metric SPC and ortho heights. Then I compare that with my OPUS results. If they do not agree I know enought to not blame OPUS. I then convert to US Feet SPC and ortho and use that in my surveying software. I have not requested extended data in feet in several years, since I am confident enough to go with the minumum amount of paper use.

I am near the breakpoint for PA S, PA N and NJ, and cannot recall ever getting a wrong SPC back from OPUS. From time to time I use a monument in one for control in another zone. Then I might request the wrong SPC zone for compatable data.

Paul in PA

Posted : November 7, 2012 9:22 pm