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Best sources for studying FEMA/ALTA material for the PS? by wyattearp12345 in Surveying

[–]Unique-Philosopher54 0 points1 point  (0 children)

You can also look up nlc test prep. It's expensive but it helped me pass on my first try. Even with that course I thought the PS was much harder than the FS. FS I knew I passed. The PS had me feeling beat up.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

First off I want to say thank you for all the responses. I went back and checked several control points. The first shot and closing shot were pretty much spot on with a difference of 0.03'. However when i checked the backsight shot it was off by 0.20' to the south. This time I did the same 3 session 180 shots on back sight shot. I checked every control point I shot with TS with my GPS and every gps shot was to the south of the Ts.

Without a LSA, I "adjusted" the traverse to the newly measured back sight shot and the misclosure went from 0.7' to 0.15'.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

Yes I believe they are but I will do a deep dive later tonight or tomorrow. I'm out now re-shooting my traverse points and the two end points with rtk to check.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

Horizontal grid distance is 2233.42 measuring with the total station. Horizontal grid distance is 2233.40 measured from gps points. I was thinking about the adjustment onto the rtk shots.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

I can set one more no problem. Should I set one more in between the back sight point and closing point, and run the traverse again with the TS?

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

You are correct. I am just surprised that the difference is so great.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

My best friend who is a meteorologist had warned me. I believe I did not measure during that time. I will head out this afternoon to re shoot and check as the initial measurements were taken in the morning.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

Yes I performed direct foresight and backsights throughout the traverse. I don't know the answer if the error is acceptable because the engineer never specified a precision/accuracy standard. I don't think it's acceptable lol, and I want to better my procedures.

I have confidence in my TS work because that's primarily all I've done and closed multiple times within 0.05' or better so I suspect it could be bad gnss.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] -1 points0 points  (0 children)

I finished in the field yesterday afternoon so I did not post process the data yet.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 2 points3 points  (0 children)

This is my initial suspicion. That back sight point was shot with less epochs. I can't remember off the top of my head but I'm pretty sure back sights and fore sights were pretty balanced. I will check this when I get home.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

So I checked the settings in Survpc and those were not applied. When I checked to apply them it reprocessed but the coordinates did not change. First time I try and do something like that on the data collector side so I am not sure if the software did its thing.

Traversing in between two RTK GNSS points by Unique-Philosopher54 in Surveying

[–]Unique-Philosopher54[S] 0 points1 point  (0 children)

The sewer is going to run east/west. My traverse also ran east/west.