..regarding OPUS-RS Solution reports. Basic parameters are operating with grid results, rapid static files (40 min .LOG files, averaging 20 min observations) with an RTK system. FIXED/VERIFIED solution. What kind of differences +/- should I be expecting in NAD 83 SPC transformation?
You need to be a member of Land Surveyors United - Surveying Education Community to add thoughts!
Add Posts, Surveying Photos, Videos and Articles to the Surveyor Community
Add Stuff to Community
We are committed to allowing freedom of expression for all of our members, and that includes maintaining a safe space for people with opposing views to express themselves. We get posts from all over the country and even the globe, so needless to say, people come with different viewpoints on lad surveying practices and processes. We see this diversity and variety as a real strength-- dialogue and debate are an integral part of the educational process, as well as an important tool in exploring different sides of complex issues.
Replies
just my "shoot from the hip" response,--- .>0.22 horriz & >0.65 vert.
Thanks Adam. Exactly the range in numbers I 'imagined' I should be getting. Problem is, my differences are uncomfortably greater in some of my test observations vs. OPUS post processed points. Of course I assumed my settings were the major culprit, but after sending my OBS files in for additional GNSS processing (not through OPUS) I'm told my solutions/settings were "working out fine". Comparing OPUS to Other, I have sub-ft. comparison accuracy in my Northing, and sub-meter in my Easting (expected better here). Vertical remains highly unaccaptable @ >/= meter differences. Again settings seem to all be correct (ie. type of Antenna, ARP, etc.) How? Why?? What the???..I don't need to get into the problems this could possibly create going forward as I assume your mind can wander through it as well. Thanks again, for your response.
If your wanting higher accuracy then you should not be using the Rapid Static OPUS solution. Time is very critical in determining the level of accuracy of your solution. The standard OPUS-S solution, which requires at least 2 hour observation times, would give you far better accuracy. NGS considers 4+ hours a minimum for a high quality solution. Once you extend your observation times and use OPUS-S, your results should be much closer to your post processing results.
an OPUS solution is really just a 3-point re-section. To achieve even greater accuracy you need to observe a closed loop network to each desired rrp so you check your closure. - ONE THING YOU CANT DO WITH AN OPUS SOLUTION.