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lasiadhi / USACE-Bathymetry

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Datum shift for survey elevation? #29

Closed clintseinen closed 8 years ago

clintseinen commented 8 years ago

Hey @thesser1 I've pulled the elevation from the transect of interest and I've noticed that this survey is referenced to NAVD88. Do you know where I can find information on shifting the data to be referenced to water level?

I'm assuming I'll need to shift it before I multiply it by -1 to get the true depth; is this correct?

clintseinen commented 8 years ago

For now I'll just flip the data, but I'll add a dumby shift variable and set it to zero.

thesser1 commented 8 years ago

You could do one of two things. You can grab a tidal signal for your time period from tides and currents for duck, nc or you can use navd88 as your datum for the initial validation work.

clintseinen commented 8 years ago

Okay, for now, I will just use the navd88 for the initial validation work. At a later point I'll look into getting the tide level from duck.