Hi, I was wondering if you have things like this happen in your area.
There is a new OSTN15 and OSGM15 (shift grid transformation and geoid respectively) for the UK. Previously we have been on OSTN97 and currently on OSTN02.
This is no problem, surveys should state the transformation used and the correct files can be used in order to tie into a previous survey.
What is new is that there are new lat/long coordinates issued for the reference stations (CORS). These are starting to be used over the weekend so the Leica Smartnet service will potentially be giving you a different value on next week to the one it gave you last week.
Changes in the CORS coordinagtes are up to 53mm vertically and 34mm horizontally.
http://www.leica-geosystems.co.uk/en/News_19726.htm?id=6757
Trimble's VRSnow have created new mountpoints so you can choose to use the new CORS values. The old mountpoints are planned to be closed at the end of the year which is a bit quick I think.
No word on Topcon's Topnet service. I assume they will be contacting their users privately.
What we have is a New Datum that is not a Datum because you cannot precisely link it to prior datums.
I see no knew corpsecon conversion program, (misspelling intended).
I see no choice on the OPUS page to use prior coordinates, alhough it may have been added over the weekend.
I consider it the death of precise surveying.
Paul in PA
squowse, post: 388401, member: 7109 wrote: potentially be giving you a different value on next week to the one it gave you last week.
Changes in the CORS coordinagtes are up to 53mm vertically and 34mm horizontally.
That's how active systems work. Better get used to working that way. This is why it is imperative to set local monuments tied to today's projects for tomorrows transformations.
I just resubmitted an OPUS from 10 days ago, came back NAD_83 (2011) (EPOCH:2010.0000)
I have to assume the minor changes were due to ultra-rapid to rapid orbit variances.
Will check other projects as time goes by.
Paul in PA
Paul, OPUS and Corpscon irrelevant to the OP who is in the UK. I think you skimmed his post a little too quickly.
Paul in PA, post: 388407, member: 236 wrote: What we have is a New Datum that is not a Datum because you cannot precisely link it to prior datums.
I see no knew corpsecon conversion program, (misspelling intended).
I see no choice on the OPUS page to use prior coordinates, alhough it may have been added over the weekend.
I consider it the death of precise surveying.
Paul in PA
Hi this in the UK so it's not OPUS.
Bill93, post: 388411, member: 87 wrote: Paul, OPUS and Corpscon irrelevant to the OP who is in the UK. I think you skimmed his post a little too quickly.
I apologize for flying fast, I thought the topic was xGEOID16A and other upcoming OPUS changes.
Paul in PA
Get use to it. NGS is currently in the analysis stage of what they reference as REPRO2016 . They haven't released any specifics yet but the three-dimension values for all the stations in the network will likely change. Additionally they have not commented on whether or not they will adjust the passive GPS control to stay consistent with the CORS and how the new values will be labeled. Networks of CORS around the will always be changing from time-to-time. It is the nature of the world we live in.
Paul in PA, post: 388407, member: 236 wrote: What we have is a New Datum that is not a Datum because you cannot precisely link it to prior datums.
I see no knew corpsecon conversion program, (misspelling intended).
I see no choice on the OPUS page to use prior coordinates, alhough it may have been added over the weekend.
I consider it the death of precise surveying.
Paul in PA
Transformations are available: GEOCON / GEOCON11. Versions 1.0 have been release, versions 1.1 are in beta.
GEOCON/GEOCON11 work very well, regrettably NGS has done almost nothing to market these tools to the user community. Not to mention that fact that the input and output formats suck.
Don't hold back on us, Dave. Tell us how you really feel!!!
😉
