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survce question – data collection
Posted by mag-eye on December 14, 2018 at 9:05 pmCan anybody tell me how carlson survey processes data if i have a single BD record and then a FD, FR but without a BR record.
I have been turning my trav. stations in set collect but for monuments and some other pts I will use traverse which then in my raw data it leaves a BD record after setting my BS followed by A FD,FR, whenever I use the traverse function
The coords are slightly different to the shots using traverse if i remove all the BD records that follow setting a backsight rather than leaving the single BD record. So it seems as if the single BD has some weight.
mag-eye replied 5 years, 4 months ago 3 Members · 10 Replies- 10 Replies
Ahh should have titled this Carlson survey question. Not sure how/if to edit the topic title
If you have BD/BR for your traverse, I believe that it will also use that to reduce the FD/FR on your sideshots. If they’re all taken from the same setup session.
If you have no BR and just BD, it will just average the FD/FR values, and won’t adjust anything that is usually based on the BD/BR values.
For example, I have an instrument where the reverse is 20″ less than the direct. So if my BS is 00-00-00/179-59-40, then all FS shots should be similar or they will be adjusted. With no BR, if I shoot a monument at 90-00-00/89-59-40, the resulting angle will be 89-59-50, instead of 90-00-00, if I had also recorded a BR.
Clear as mud?
I do not use SurvCE or Carlson. I use Survey Pro to collect and Star*Net to reduce my data. If I do not have a complete set of BD/FD/FR/BR data the conversion to StarNet dat format just crashes.
If anybody is interested here is a sample RW5 file to run direct reverse report on in carlson survey notice how it ignores pt 53.
I would like to know how Carlson survey processes BD FD FR BR records more in depth.
I hope i attached this correctly just rename the file to Rw5.
Here is my complete rw5 data 1 original and 1 that i edited if anybody would like to take a look.
Specifically how the BD etc. sets are handled.
Ahh monday.
As said in my prior post, if you have D&R on your BS, it will use that split to adjust your average on the D&R split for your FS shots.
If you have no R on your BS, it will just give you the average of your FS D&R.
Your BR shots are generally only 1-2″ off 180, so your adjustment on the FS sideshots will be only 1″ or less.
So your results will be almost the same as if you had a BR shot. That said, it’s bad form, and you don’t know if someone kicked the leg after the BD shot. Also think it’s a good practice to shoot a check shot on the BS as your last setup shot.
JPH thats why i posted this…..
The FD/FR to pt 53 that follow the initial BD shot is ignored. Ultimately after processing the angle from pt 49 to 53 is just the FD record no average. Pts 54,55,56 average the FD/FR.
In my data whenever i reset zero on my BS it has a BD record once i removed all the extra BD records not needed for the sets 1 thru 3 all other FD/FR records were averaged.
Just trying to make sense of this.
What i would like to accomplish is full sets on my traverse and just 2 face measurements to other critical pts.
But whenever i reset zero in the field i get a BD record leaving me cleanup in my RW5 data.
Weird If I do a set (by set i mean set collect in carlson survce) Oc 2 BS 1 FS3 then followed by just an FD/FR to 51 it pulls the BD/BR from the set to 3 but if there is s/s records after the set then followed by FD/FR just the FD/FR are used.
In survce in my settings i only have traverse set to forward and reverse not the BS I dont want to take a forward and reverse reading to my BS every time i set zero.
So maybe if all i want i a forward 2 face measurement i should be going about this a different way
I feel like people may be recording there sets differently then me doing an initial BD/BR reading ant then using Traverse FD/FR to how ever many pts they want applying the single BD/BR readings to multiple other FD/FR sets.
How is that for clear as mud haha.
Thanks to all who are putting time into reading this.
Sorry just trying to keep this up front.
I have been doing some testing of data sets (BD BR FD FR). Finding some interesting results.
I thought there was a lot more Carlson users on here that could share some info.
Maybe I’m wrong but some may be interested to know that in Carson survey processing rw5 data if you have a BD/FD/FR/BR record in any order with just a FD/FR to a different pt immediately following the complete set it takes the BD/BR from the prior set to complete the set to that pt.
It’s crazy to me that there is nothing explaining this in any Carlson manual/help that I could find
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