Nate The Surveyor, post: 413203, member: 291 wrote: I did not sign any non-disclosure agreements...In talking with others, who have evaluated equipment, they SIGN non disclosure agreements, which means, they can't talk, like I do.
The only time I have been asked to sign a NDA is if the manufacturer is providing an unreleased hardware solution for beta testing. In is not common practice for a manufacturer or dealer to request a NDA to be signed prior to any field demo or evaluation of a released product.
A happy customer is a manufacturer's best sales person.
obviously it's a static session, why not set it a few feet away nearer the curb?
Because to move the property monument so that you can get your shot a little easier is just slightly unethical.
Because there is no way you could get 3 repeatable shots in an area like this any other way.
FrancisH, post: 413760, member: 10211 wrote:
obviously it's a static session, why not set it a few feet away nearer the curb?
Its not a static session. If it were, I would be making my observation in the wide open. This is an extended VRS observation, 5 min, to make sure I get a good position on a property corner located under the branches of a Live Oak. Another clue that it is not a static session is the MiFi strapped to the top of the pole.
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Its not a static session. If it were, I would be making my observation in the wide open. This is an extended VRS observation, 5 min, to make sure I get a good position on a property corner located under the branches of a Live Oak. Another clue that it is not a static session is the MiFi strapped to the top of the pole.
huh? ever heard of establishing 2 controls in open area even using RTK and occupy with TS, backsight on the other control and then sideshot the corner under the canopy?
Uh oh! Here goes FrancisH, again!
I am just baffled, beleaguered and dumbfounded why surveyors insists on taking shots under canopy when you have other options that would take less than 10 minutes - via RTK & TS?
FrancisH, post: 413784, member: 10211 wrote: huh? ever heard of establishing 2 controls in open area even using RTK and occupy with TS, backsight on the other control and then sideshot the corner under the canopy?
Of course.
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FrancisH, post: 413796, member: 10211 wrote: I am just baffled, beleaguered and dumbfounded why surveyors insists on taking shots under canopy when you have other options that would take less than 10 minutes - via RTK & TS?
Sorry you are so confused by one photo that was intended to help someone understand the advantages of GNSS over GPS alone.
Have a good day.
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Sorry you are so confused by one photo that was intended to help someone understand the advantages of GNSS over GPS alone.
no I think you really thought that GPS/GNSS under canopy would work like it was under open skies hence your photo.i think this is how you do your work everyday. canopy or not.you just let the unit stand there for hours not thinking that 5 minutes with RTK/TS will do same work.
i have had several instances where a "fixed" solution in the field came up several decimeters off when post-processed in the office and compared
with TS network.
Well....this is another GNSS receiver under canopy using the VRS system....seems to be 
operating fine to me...
My recent experiences...I was locating some corners in the woods. Western PA winter, no leaves on but wooded area of deciduous trees. Trimble R10, VRS. If there is any doubt in my mind at all, we will do both a VRS and a total station shot. And I am always skeptical in the woods.
We initialized outside of the woods (corner was about 30 feet in). Occupied the point as observed control. Then dumped the init, and tried to re-init on the point (known point initialization). Kept getting about 30 to 40 cm, would not get any lower. Set a pair in the open, shot it in with TS. GPS position was off by about 10 cm. Multipath.
Another site, this time it was right on the edge of trees, but there was a high steep hillside to the west. First occupation aborted after 35 s, and it was 26 cm H and 55 cm V against the total station shot. Second occupation made it to 155s, it was 2 cm H and 5 cm V versus a total station shot from a pair.
I don't like to rely on GPS alone for an important shot in the woods (aren't they all important?). A few minutes is not enough time to get rid of the ugly effects of multipath. However, there have been times when there was no choice, for example no suitable open location nearby. In a case like that I will set one receiver in the open, and let the one in the woods run for a few hours (static, post processed). I have found that I can have high confidence in a situation like that, time will always triumph over multipath.
Hey, francisH, what brand, and specs of GNSS do you use?
And, this reminds me of an old tire comercial, for "Jetzon" auto tires. Here is the comercial:
"If you are not riding on Jetzon tires, please slow down".
Not all GPS can "go there".
And, some have much higher confidence, than others. I'm still an advocate for multiple shots, in hard places. If for no other reason, to provide some layer of redundancy. It ALSO tends to tighten critical shots.
Without some means of redundancy, stay out of canopy. Now, automated redundancy...hmm who might have that?
Nate
Hey, francisH, what brand, and specs of GNSS do you use?
And, this reminds me of an old tire comercial, for "Jetzon" auto tires. Here is the comercial:
"If you are not riding on Jetzon tires, please slow down".
Not all GPS can "go there".
And, some have much higher confidence, than others. I'm still an advocate for multiple shots, in hard places. If for no other reason, to provide some layer of redundancy. It ALSO tends to tighten critical shots.
Without some means of redundancy, stay out of canopy. Now, automated redundancy...hmm who might have that?
Hey Nate,
I use Sokkia GSR2700 IS, GCX2; Topcon GR5; 2 units of each
And this reminds of the movie "Eagle Eyes" where the CIA was able to track Will Smith's location INSIDE of a building via GPS signals.
Not all GPS/GNSS can "go inside| of buildings.
And, some have much higher confidence, than others.
BUT you see in MOVIES, writers/directors can make you believe GPS signals can pass through cement walls too.
Ha ha ha ha ha DON'T BELIEVE EVERYTHING YOU SEE IN MOVIES
However, there have been times when there was no choice, for example no suitable open location nearby. In a case like that I will set one receiver in the open, and let the one in the woods run for a few hours (static, post processed).
My former boss answer to this type of scenario would be
"Then get out your
and start making a path for your traverse lines!"
No such thing as "NO CHOICE"
You know, FrancisH, I actually have a bit in common with you. You are a crusader. You want everybody to up their game.
You cannot understand sorry surveying.
We still live in the wild west.
Nate
Well no one has said it yet. I run the Carlson BrX5 units. They work phenomenal in the timber. One of our crews were running them without the Glonass on. (They didn't know...) They still kinda worked in the timber but once they had the Glonass on it is rare they don't have a fixed solution. Also very affordable and I find user friendly.
N.W. Staker, post: 414949, member: 11801 wrote: Well no one has said it yet. I run the Carlson BrX5 units. They work phenomenal in the timber. One of our crews were running them without the Glonass on. (They didn't know...) They still kinda worked in the timber but once they had the Glonass on it is rare they don't have a fixed solution. Also very affordable and I find user friendly.
Thanks for the review. I have a salesman hammering me to replace my Topcon hiper+ rover and Legacy base with the Carlson system. So far, his only sales pitch has been low price. He doesn't have any inventory to rent me and I don't want to invest that much money in old technology.