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re: How do surveyors determine elevation of land?
Posted on 8/13/16 at 2:33 pm to civiltiger07
Posted on 8/13/16 at 2:33 pm to civiltiger07
quote:Presumably (hopefully) that was quite a few years ago. Or else you're using semi-antiquated receivers.
that is one of the most boring jobs ever! Sat on side of the interstate for 10 hours watching a GPS antenna.
Modern GPS receiver need nowhere near that length of time to get a set of observations.
In response to the OP: While we still (casually) use the terms "sea level" and "mean sea level" when referencing elevations, technically we refer elevations to a datum that is based on orthometric heights and the geoid (e.g. NAVD 88). "Mean Sea Level" varies among various bodies of water, and is changing somewhat (slightly) due to recent increases in temperature at the poles (and the resultant melting of ice caps).
2
Posted on 8/13/16 at 2:50 pm to dawg23
quote:
of the most boring jobs ever! Sat on side of the interstate for 10 hours watching a GPS antenna.
You're just doing it in the wrong spot. It's nicer sitting at a weir in the marsh catching redfish or crabs non-stop.
Otherwise, I'm pretty sure it still takes that long if you are getting a raw position and using an OPUS solution with no other inputs.
Recommended minimum is 6 hours if I remember correctly. There are just so many monuments and cell-based RTK corrections are so widely available now that you can usually set a decent monument in just a few minutes.
I wonder how the geoid measurements (gravity readings) will change with the sea level issue? Not much I presume.
Posted on 8/13/16 at 3:32 pm to dawg23
Yea it was about 12 years ago.
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