Today I did a 45 min. static OPUS session to confirm an averaged VRS point I had extablished. The OPUS report came back with an ortho height 7.51' higher than my averaged VRS point. The header of the report gave warning that no antenna was selected and that the coordinates reported are for the ARP. I entered my rod height and selected an antenna for my Epoch 50, which now has NONE listed next to it, but in the OPUS report the antenna name shows up as NONE and the ARP height is 0. I noticed that most of the antennas listed now have "NONE" next to them and I'm not real sure what that means. The 7.00' rod height would account for most of the error, but the remaining 0.51' is larger than I typically see between my VRS and OPUS. Could this be because the antenna is/isn't listed? Anyone have any ideas? The VRS and OPUS are both NAD83(2011)/ Geoid12A.
Yup,
Same deal. 12 sessions I checked, resent, deleted my profile, resent. Same deal. OPUS is broken today.
Weird though my static sessions are returning just fine.
Mike
NONE
Within the context of the Antenna "name," NONE means without radome.
Within the context of the antenna "selection," NONE means NONE.
Whenever you select antenna "NONE," the results are expressed at the ARP simply because the L1-ARP value is UNKNOWN. I suspect this serves to ANNOUNCE that the Ellipsoid Height is suspect at best...
This may also be why the "rod" (HI) isn't factored in.
But as pointed out above, OPUS_RS must be having a bad day.
Loyal
correction...radome NOT choke-ring OOPS
With a "none" antennae type selected, the OPUS solution is returning the coordinates of the Antennae Phase Center. So to get the proper elevation-height-what have you, one would subtract the rod height to the Antennae Reference Point (typically the mounting point)+ the difference to the antennae phase center. Used to be I could find manufacturers drawings that spelled this out. Your EPOCH 50 looks like 0.107 meters, but it doesn't really elaborate whether that is to the APC. NGS calibrates each antennae brand, which isn't necessarily the same thing.
So assuming a rod height of 7.00 to the ARP plus 0.35' you are in the ball park.
That's what I was thinking. I will resend the file tomorrow. I did select my antenna and enter a rod height, which has always worked before, but for some reason OPUS is ignoring these today.
Pay Attention To The Response Comment After You Submit
It may indicate that OPUS/OPUS-RS is using an old profile.
Paul in PA
