You can buy complete systems, used, off eBay. You can buy name brand equipment, for 20-30k. Base and rover, radio. New.
You can (Apparently) buy good new Chinese gear, Mark Silver style, for less than 5k. Base and Rover, and low power radio.
Many of us, are simple cobblers. We bought gear, learned as we went. Still learning.?ÿ
In the next 20 yrs, there will be more sats up. More double checks. More everything.?ÿ
Never before in history has there been so much available, for so little.
We could use a little book, with basic gps stuff, to help the next generation. Stuff like:
Scale factors.
Convergence angles.
Local coord systems.
SPC
Various projections, and how to work between them.
Realistic and practical error analysis. Relative error potential.
Good habits for the concientius surveyor.
How to be honest, in a multi-path environment.
Does such a book yet exist?
The next generation of surveyors could benefit.
Nate
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BUY NOW! BEFORE THE PRICE GOES DOWN.
Paul in PA
@paul in pa,
Ha ha.
I'm experiencing a number of plats, done by folks, with "eBay specials". They bought used gear, and don't know what they are doing.
N 😐 ?ÿ
That has been the norm for anything electronic since at least 1973.
We could use a little book, with basic gps stuff, to help the next generation...
Does such a book yet exist?
GPS for Land Surveyors is a "little book", relatively, but much more than a pamphlet. PDF versions are available for $15.?ÿ
User Guidelines for Single Base Realtime GNSS Positioning , free for the downloading.?ÿ
These 2 should be enough to put anyone ahead, knowledge-wise, of 99% of their competition while still being an achievable level of effort.?ÿ ?ÿ
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That, and I'd like to see everybody get behind LDPs. Truly the way to go.?ÿ?ÿ
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GNSS only became usable for my business with developments in 2013/14.?ÿ Can't do without it now.?ÿ But yeah, I run into error and mistake on a certain order that evidence can usually explain in surveys 1700's through about 1980.?ÿ Then much less during edm era about 1980 through about 2000, but still fairly simple to evaluate with evidence.?ÿ Still edm use of course, but 1990's to current run into anomalies that are harder to explain with evidence and sort of have to assume someone had a "bad fix in rtk" or some coordinate system problem. With the newer systems (and a bit of education/training), hopefully we get back to a place where it's as reliable as edm.
That, and I'd like to see everybody get behind LDPs. Truly the way to go.?ÿ
Sidetrack from the OP, but I agree.?ÿ The metadata should be there to tell you what it is, but I wouldn't bet on it.?ÿ?ÿ?ÿ
I've been looking at several recorded surveys done in the last decade or two, and it is impossible to tell from the plat whether they are giving ground distances or SPC grid distances.?ÿ I've checked with my GPS on one and am pretty certain it is grid distances, with?ÿ no indication on the plat.?ÿ His "assumed" bearings match well as SPC so I know he was working in SPC and probably didn't convert the distances. Another plat fits well as ground as it should be if not otherwise noted.?ÿ Some others I'm trying to fit together could be either, as the difference is smaller over their distances, but you wonder when their bearings line up as SPC.
At least with LDP you can probably use grid and ground distances interchangeably to sufficient accuracy for most purposes.
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The difference can definitely be noticeable. My opinion is that everything on a deed should be in ground distances.
Many states also have a version of a GPS Handbook..
http://www.wsrn3.org/CONTENT/Reference/Reference_GPS-Guidebook-WADNR.pdf
If you were going to buy a new complete RTK system solely for construction stakeout from JAVAD what would you buy? The whole package. ????
I love Z12. So cheap you can??t give them away. And mm for mm, identical new TS, T2 and HP 3805 which are also NCV. Add Giant Wild triples for not much and 10,000 ft range.?ÿ
The best free lunch is OPUS! GNSS for differential baseline and StarNet demo. I??ve got more horsepower for next to nothing than I used for 20+ yrs.?ÿ
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@flga-pls-2-2
Well, I DO NOT work for Javad. I fish for my own dinner, and eat what I catch. Having said that, there are some things that JAVAD does real well. And, some things it does not do so well. For EARTH work, and early staking, through the woods, it's the bomb. It catches it's own errors, and is an excellent tool in the woods. It does NOT hook to a total station, or a robot, so for construction staking, that would be a hindrance. Some const staking has to be tighter than RTK. Concrete for example. Cannot go up and down a few hundredths. One thing it does real well, is the database is DIVIDED, into SURVEY points, and DESIGN points. I can dump out all the design points, and install new ones, VERY FAST. Twimble needs to learn that trick. (I have not used their data collector for years, so, if it does it now, I would not know).
JAVAD now has a new T-3 for use as a base station. That's good. But, it may be a while before it kicks hard. We will see.
Once you learn the routines, there are some fantastic things in a Javad. But, others are clunky. Ah!
Hope you find what you really need.
Nate
There's never been a better time to kick the can down the road when it comes to the next generation. Books are great but not a substitute for formal training and education.
I know it's not a popular opinion around here, but it bears repeating...considering the array of technologies that geomatics professionals need to be familiar with nowadays, "the way forward" should include requiring an accredited four-year degree in a geospatial discipline, containing both fundamental and geospatial-specific coursework, prior to licensure.
Licensed practice is the big leagues, and we should treat it as such. The number of professionals who cannot speak intelligibly about geodesy, GNSS, error propagation, datums, coordinate systems, grid vs. ground, transformations, etc. is disturbing. Equally disturbing is that most will tell you they are an expert in those subjects.
As ease of use goes up and price comes down, more and more customers are going to want to know why they should pay us to gather, process, and interpret data. The answer should be "because we are the experts" rather than "the law says you have to".
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Twimble needs to learn that trick.
Trimble Access does that. No problem.
Thanks Natester - Looking for a total system for staking houses primarily (15-25/day). New owner wants GNSS/GPS complete system specifically for house staking.
Any of the rest of y'all that might have a suggestion I would appreciate your input. Really don't care about which "Brand" it is as long as it does the job. Money isn't a big consideration if the ROR is excellent.
Thanks in advance! ????
The Washington DNR, (Public Land Survey Office) has several good guidebooks on other topics in addition to that one. Unfortunately they aren't getting the ongoing updates they deserve, and are slowly drifting out of relevance.
Typical scale factor distortion in an LDP is less than 1:100,000. And it is often much less than that. In other words, the distortion from scaling is less, much less, than common instrumental errors. That's the beauty of it. You can ignore the scale factor distortion. LDP grid distances are ground distances at 2 decimal places.
Also, the convergence angles are on the order of a few minutes.
We could use a little book, with basic gps stuff, to help the next generation...
Does such a book yet exist?
GPS for Land Surveyors is a "little book", relatively, but much more than a pamphlet. PDF versions are available for $15.?ÿ
User Guidelines for Single Base Realtime GNSS Positioning , free for the downloading.?ÿ
These 2 should be enough to put anyone ahead, knowledge-wise, of 99% of their competition while still being an achievable level of effort.?ÿ ?ÿ
?ÿ
That, and I'd like to see everybody get behind LDPs. Truly the way to go.?ÿ?ÿ
?ÿ
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Sorry, my prescription must be poor.?ÿ Where is it available for $15 for the pdf??ÿ I can only seem to find the print and epub versions.?ÿ Maybe it's a Canuckistan issue?
How about two inches per half mile? That's more like 1: 16000. We have encountered that quite a number of times. Somebody is wrong. Our GPS and our total station distances agree, but not with the other guy. Doesn't really matter who the other guy is if he is using state plane.
I googled the title + pdf last night and found it for free. The website was something “engineering books”.
