Forum Replies Created
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I’m not sure I have seen ok VTG-data to be honest… We have four Emlids, and Mikael Lennermark has also seen this VTG inconsistency, however I can not say for sure whether he used this exact RTK or one of the others.
We have done a lot of normal RTK-work with them though without any apparent issues, but I think for taking point measurements they use mostly GGA.
Ah, perhaps there is an offset here. But I don’t think so, the angle between GGA and VTG varies by quite a bit. Perhaps I’m not moving fast enough to make the VTG-positioning work?
Hi James!,
Sorry for this tardy response, I was on vacation and had to hit the ground running with a surge of floods hitting just as I got back.
I will use the old proverb, “great minds think alike”, as I actually landed on that exact same model and have two waiting for me back at the office!
I expect any use of a Raspberry Pi to be a bit of a hassle to get through our IT-security people as they are very strict about adding stuff into their ecosystem/infrastructure. I do love the RPi though. I will likely send you a message once we hit a brick wall inventing the wheel again!
Hi all,
Very good suggestions. The waterproof RC is sorely needed..
To add to the flora of RC-boats for ADCP, here is another one:
Hi Katarina and Maud,
Without being able to contribute much to answering your question I think part of the problem with hysteresis is that it can be a bit cryptic. You will need quite a lot of measurments on a rating curve to be able to discern what is hysteresis and what is uncertainty or just stochastic variation due to some rocks moving here and there.
To further complicate things, I would also expect stations where there is a lot of measurements to have man made weirs to a larger extent, and therefor to be less prone to hysteresis. I might be dead wrong here though.
However, I have seen some brilliant examples of hysteresis on rating curves created by Mark Randall. In his example he used a fixed camera to capture video for surface velocimetry and did several hundred discharge measurements during the course of a year or so and the hysteresis was very evident.
/Daniel
We could have a sticky forum post with a link to the Agenda document. I could also use a calendar tool to show information about up coming meetings.
/Daniel
Cheers Kevin!
Ill update the member presentation page and go ahead and publish it. Ill add the rest of the member presentations along the way.
Hi,
I seem to remember a discussion led by Mark Randall where certain video formats inject “fake frames” which could mess up certain methods. We are also interested in the answer to this question as we are just starting to put cameras out on a couple of hydrological stations, hopefully Mark will be able to elaborate.
We (or rather Tomas, our mech wizard) have now created a rig for the sensor which should raise it 25 cm above the water level with an adjustable tilt-angle for the RiverPro Trimaran.
What’s left is to figure out how to log and timestamp the data from the SVR.
/Daniel
I’m of the same mind Nick, I don’t see how it would be feasible to do most Q-measurements without a keyboard. We have also moved to a web-based interface for all site notes, so theres even more need for a keyboard.
We haven’t moved to the new field computer yet (our current laptops have a couple of years worth of life in them yet), but I thought it would be good to hear if anyone had any experiences since that is the likely replacement in the event of a catastrophic failure of any of the current laptops.
/Daniel
The European Commission also hosts a site for the project:
Thank you Dave! That looks perfect, I’ll add it to the draft page. Perhaps I can steal your forum picture as well?
Thanks Kevin,
If everyone think it is a good idea, I can create a page on the homepage with the charter.
Interesting Nick! Good catch!
I thought QRI was a new piece of software that I had completely missed, I’ll just stick to Qrev-int for the time being.
If I remember correctly, there is development planned for Qrev-int to display SA, perhaps Dave can accomodate this then?
(Also, we are doing first tests with ADCP-mounted SVR in August if all goes according to plan!)
/Daniel
Hey there! testing/Mikael
Hi Mikael!
Looks like the profile picture upload works ok?
