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Testing RTK and Post Processing in Canopy

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(@nate-the-surveyor)
Posts: 10522
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Yes, I over did it. Yes, I think that the Javad is a fine tool. I also am real fond of atv's. And I'm real fond of my wife.
I keep most of that that quiet.
I grew up surveying. I surveyed with a 1923 Adolph Leitz transit, until 1985, when I went to Chicago, and worked for Harry B Blizzard, and Associates. Construction Staking. We had a t-2. And then, a Set 4 Total station.
Came back to Arkansas, a yr later, and dad still had the 1923 Leitz. I pooled my savings, with some of his work. Got a tm20c theodolite, and a big K & E Autoranger S. Where I'm coming FROM, with all the meticulous labor that goes into real, battery free surveying, then to just almost completely modern GPS surveying... I'm in survey heaven.
Sorry for the overdoing it. It won't happen any more, UNLESS I think about it. Then, it could. Sorry. Its the best thing since sliced bread. It's like going from flying a kite, to afterburner! Yes, it can be abused. But used with wisdom, it is nice. I stop and take pics now.
Work hard, stay late.
I have a smelly rag stuffed into my liking of the Javad gear. But, a little may leak out, from time to time.
It won't happen... As bad...choke choke.
It's raining in Arkansas. My wife is preg. My dauter has a fiance lined up, and I have a Javad.
I need to stay off the forum. And get more work done.
May your errors be small, and your supper be hot.

Nate

 
Posted : April 19, 2016 3:51 am
(@steve-d)
Posts: 121
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Jim Frame, post: 368043, member: 10 wrote: It's a fair question: where do you find the line between advertising and information useful to the community?

Shawn and a few others clearly have a business relationship with Javad, but if they're providing descriptions of equipment that operates significantly different from other gear on the market, is it advertising or user assistance?

In Nate's case, I'm pretty sure it's just a matter of an enthusiastic end user sharing his experience with the community. More enthusiastic than most to be sure, but nothing nefarious that I can see.

I am a JAVAD owner (less than one year). I think it is helpful to see the post from everyone. I do take issue with the post from those who have an interest in the company (Sean, Adam, John Evers, etc.) and do not declare their conflict in their post. I see that the Carlson employees and reps declare there conflict in their post. I think we are all professionals and can decide the value of a post if we know the motivation of the poster.

JAVAD sales and support; please let us know the full story when you post.

 
Posted : April 19, 2016 4:20 am
(@steve-d)
Posts: 121
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Nate The Surveyor, post: 368098, member: 291 wrote: Yes, I over did it. Yes, I think that the Javad is a fine tool. I also am real fond of atv's. And I'm real fond of my wife.
I keep most of that that quiet.
I grew up surveying. I surveyed with a 1923 Adolph Leitz transit, until 1985, when I went to Chicago, and worked for Harry B Blizzard, and Associates. Construction Staking. We had a t-2. And then, a Set 4 Total station.
Came back to Arkansas, a yr later, and dad still had the 1923 Leitz. I pooled my savings, with some of his work. Got a tm20c theodolite, and a big K & E Autoranger S. Where I'm coming FROM, with all the meticulous labor that goes into real, battery free surveying, then to just almost completely modern GPS surveying... I'm in survey heaven.
Sorry for the overdoing it. It won't happen any more, UNLESS I think about it. Then, it could. Sorry. Its the best thing since sliced bread. It's like going from flying a kite, to afterburner! Yes, it can be abused. But used with wisdom, it is nice. I stop and take pics now.
Work hard, stay late.
I have a smelly rag stuffed into my liking of the Javad gear. But, a little may leak out, from time to time.
It won't happen... As bad...choke choke.
It's raining in Arkansas. My wife is preg. My dauter has a fiance lined up, and I have a Javad.
I need to stay off the forum. And get more work done.
May your errors be small, and your supper be hot.

Nate

I don't think you are out of line or over doing it. Keep it coming.

 
Posted : April 19, 2016 4:23 am
(@nate-the-surveyor)
Posts: 10522
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In this I commented that a fella should sell his robot and buy a javad.... Thats where I over did it. It's not quite that good, but it is close. The trouble is in the definition of canopy, and the diminishing return, on your time invested, in real bad places.
I was overdoing it there.
I guess it is the best, and I overstated it there.
Sorry.
But, I still like my Javad.
Nate

 
Posted : April 19, 2016 4:28 am
 adam
(@adam)
Posts: 1163
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Steve D, post: 368104, member: 433 wrote: I am a JAVAD owner (less than one year). I think it is helpful to see the post from everyone. I do take issue with the post from those who have an interest in the company (Sean, Adam, John Evers, etc.) and do not declare their conflict in their post. I see that the Carlson employees and reps declare there conflict in their post. I think we are all professionals and can decide the value of a post if we know the motivation of the poster.

JAVAD sales and support; please let us know the full story when you post.

I think that is reasonable, but there is a little more to it. I am a working Surveyor, that is my job. I bought and paid for my equipment and was only added to the Javad support team within the past few months. Every one of the the Javad support team are working surveyors too. I haven't declared my conflict because since being a part of this team I haven't posted anything that would suggest that I am trying to sell anything. I am not driven by sales. I post to answer questions that have been asked. I have always figured this site was similiar to a group of buddies hangin out in the parkin lot, all setting on the tailgates of each's favorite brand pickup, having a cold beer, and swapping knowledge and tall tales.

 
Posted : April 19, 2016 4:44 am
(@mark-o)
Posts: 175
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In order to take advantage of the Javad, you really need the rover/base setup, correct? How does it fare under moderate/heavy canopy on an RTK network. Does anyone use one only as a rover only?

I just flipped one of my rovers for a robot and now I'm having a little buyers remorse.

BTW, I'm a civil engineer just getting back into the surveying end. I really enjoy it more than sitting behind a computer all day. So goign with GPS was a no brainer. But I also use drones and other technological tools to assist me in my work.

 
Posted : April 19, 2016 5:24 am
(@toivo1037)
Posts: 788
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Adam, post: 368112, member: 8900 wrote: I post to answer questions that have been asked. I have always figured this site was similar to a group of buddies hangin out in the parkin lot, all setting on the tailgates of each's favorite brand pickup, having a cold beer, and swapping knowledge and tall tales.

And that is why this site works.

 
Posted : April 19, 2016 5:30 am
(@jim-frame)
Posts: 7277
 

Mark O, post: 368117, member: 11591 wrote: In order to take advantage of the Javad, you really need the rover/base setup, correct? How does it fare under moderate/heavy canopy on an RTK network. Does anyone use one only as a rover only?

Like any modern GNSS receiver, if you have access to an RTK network, a single unit is all that's needed. If you want to get corrections at a rate faster than 1Hz, you'll need a base as well unless your network provides the faster updates.

Most of the time I use my Javad as a network rover using a public network at 1Hz, because I'm working close to a network base, I'm in the open and just hitting a few control points. But I do have a base and radio so I can take advantage of the faster corrections when conditions warrant it.

P.S. I'm not on the Javad support team; like Nate, I'm just a user.

 
Posted : April 19, 2016 5:39 am
(@david-livingstone)
Posts: 1123
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I'll throw out my experience this last winter using our Hiper II's in heavy canopy. I was shooting manholes in fairly deep ravines with varying amounts of canopy, some of it pretty heavy. This was done when the trees were bare or RTK would have been impossible. I was working for one of our other offices and it appears the Hiper II's worked better in the trees than the GR3's they had. There GR3's had problems with radios though so that could be related.

Some of the shots I took required as much as 15 minutes to get a fixed solution. I don't have hard numbers but I would say somewhere around 2% to 5% of my fixed shots were bad. I would get at least a couple of fixed shots each time and compare. The bad shots were often out 10 feet horizontally and vertically. Of course there was a chance even though I got two fixed shots they both could have been wrong as they were usually taken just a few minutes apart. This was for sewer system planning so the work was adequate for its intended purpose but working in that kind of environment with RTK just isn't good. My opinion with the Hiper II's RTK is that it is more likely to get a fixed solution in heavy trees than other systems but is more likely to get a bad fix.

In the past we had one of the original Hiper systems without the Glonass, our current system had the Glonass. With the old Hiper system it would get a bad fixed solutions and carry it until it lost fix again or you forced to refix. Normally this wasn't a problem but was when collecting topo on a four wheeler and driving near a tree or something and getting a bad fix. You had to be aware of this problem and stop and check yourself when you drove near any kind of obstruction.

 
Posted : April 19, 2016 5:54 am
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