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I was tying into control from a previous survey which was supposedly done in NAD83 and the coordinates I was given looked like SPCS but when I staked out to the control there was about an 8.5?? shift between the two surveys. Only explanation I can think of is the previous job was started on an assumed point on a SPCS job. Anyone else run into anything like this?
Posted : June 9, 2023 9:26 pm
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Regularly. 8.5 feet sounds to me like the job is based on an autonomously positioned GPS base station.
Posted : June 9, 2023 10:18 pm
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Also two other possibilities
1 Scaling to ground from 0,0 origin
2 international feet units
Posted : June 10, 2023 5:34 am
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Another possibility is using ITRF rather than NAD83 for the geodetic basis. Seen that happen quite a few times.
Posted : June 10, 2023 7:30 am