Digital Leveling - Onboard Average vs. Manual Lowest Reading

field-dog · 2021-05-26T23:02:00Z

My Topcon DL-502 can be set to shoot the rod 2 to 9 times and display an average. Our preferred method is to manually shoot the rod at least 3 times until the lowest reading is obtained. Our method is based on waving the rod, where the lowest reading occurs at the instant the rod is perpendicular to the ground. The other day I got something like 4.451, 4.454, 4.454, and 4.454. For all you statisticians out there, 4.451 looks like an outlier. That being said, 4.451 would be the recorded rod reading. I do not agree with our method. Clearly, the last 3 shots are grouped together and the first shot is an outlier. Assuming the level has been properly peg tested and the rod bubble has been calibrated, I would choose 4.454 as the correct rod reading.

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Posted by: @rover83

The crews were required to take six 5-epoch observations in quick succession for any point that would be used as a total station setup or was a boundary monument.

I think he would compare the RTK elevations with those from the computed elevations from the total station BS/FS. Nothing wrong with that procedure. It adds another level of comparison of position values from 2 different instrument type.

Posted : May 27, 2021 5:35 pm

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Digital Leveling - Onboard Average vs. Manual Lowest Reading

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