Does anyone know of a software that will allow for non-raw file based coordinate adjustment by Compass and/or least squares? For my small, single angle traverses? Like the old TDS Survey Pro (except for least squares)? Where the user defines the traverse sequence and side shot sequences by point number from a p,n,e,z,code coordinate file only? Looking for a windows 10 version that doesn't break the bank. Thanks!
For small traverse adjustment by compass rule? I'd just spend an hour or so in Excel creating a worksheet that does it automatically. I don't even bother looking at compass rule any more, I just check that my closure is within reason and go straight to LSA evaluation.
For least squares, non-raw input? StarNET is probably the way to go. There might be some other very basic programs, but probably none that are both as easy and as rigorous with good reporting.
Thank you!
I am with @rover83 if these are small traverses just google or grab almost any elementary surveying book and just build it in excell. I think i still have a full adjustment and DMD sheet sitting in a folder. If you have a code person they could probably write a python script in a little bit. To do the same. I have an old smi card in a hp 48 that will as well. But sine and cosine and converting dms to decimal and back adding and subtracting is really all it is.
Dittos on the excel spreadsheet suggestion. It's not that hard.
I did see this online little program q-cogo. Kinda written for students but i did a quick look and it had traverse adjustment and a few other cogo basic functions. I didn’t dive into it or anything but was free.
Thanks all. Prefer to have LSA capability to include GNSS and other ties: probably beyond my excel skills. Again coordinate based without raw files. Does anyone know if newer versions of Survey Pro have point(non raw) based LSA adjustments, on like a recon or other mobile windows device? Prefer windows 10 but would consider that. Trying not to spend $$$ to adjust relatively small errors.
If you want LSA then starnet or geolab or trimble business center or whatever brand of equipment you are running. So if carlson in field get carlson office software. If trimble TBC. If spectra old TDS get that. If you want free sign up for opus projects and use opus projusts manager. But that all need to be on datum or state plane. You could scale later. But no assumed coordinates like 5000, 5000. That will take gvx rtk vector format and probably just about any conventional angles distance format that most data collectors can export out. Just make sure your process is all control first. Its not going to hanle all those topo shots easily but thats an option for free.
Does anyone know if newer versions of Survey Pro have point(non raw) based LSA adjustments, on like a recon or other mobile windows device?
I'm a little confused by the terms "point-based" adjustments versus "raw adjustments". Least squares requires raw observations, plus their weights, in order to properly adjust; it's not possible to just plug in coordinates from an unadjusted traverse and run LSA.
The only way I can think of to do a "Compass Rule" adjustment without raw data is to do a count adjustment. Simply adjust the coordinate miss by the number of stations. If there were 10 setups then at the fifth station the adjustment would be half of the miss.
With any tight traverse it wouldn't be far off the actual Compass Rule number. I guess it would be something.
I would always close out my traverses, then do the Compass Rule adjustment in the field on a page in the field book, an early form of spreadsheets. I can't imagine collecting traverse data, heading back to the office, running some adjustment in a spreadsheet, reentering the numbers, heading back to the field.
I agree. LSAs work by adjusting the observations. I suppose that it would be possible to inverse raw observations from the raw coordinates, adjust those, and recompute finals. Compass rule, on the other hand, applies the adjustment to the computed raw "latitudes and departures". At least that is how I was taught.
I am aware of no free LSA packages. Spreadsheet development is always possible but a person would have to be pretty clever to do it.
The cheapest LSA option I'm aware of is SurvNet, which people who own Carlson Survey for other purposes will already own. So depending on your circumstances it might be considered free, or at least no extra cost.
This sounds to me like a field expedient fudge factor application rather than a rigorous compass rule adjustment. Not knocking it, I'm sure that it works just fine.
Remember that the real advantage to a LS A is the ability to incorporate cross ties and networking. Also to simultaneously adjust GPS vectors and TS measurements. For a simple loop traverse the results are going to be similar with either method.
Given the final misclosure by bearing and distance, the correction to the intermediate points is proportional to the distance along the traverse and at the same bearing as the misclosure.
Thanks all!
There is a free (open source) LSA program. The University of Texas at Austin's SALSA program.
It is somewhat overkill, but more than enough to give you a true LSA.
