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re: How do surveyors determine elevation of land?
Posted on 8/13/16 at 6:20 am to upgrade
Posted on 8/13/16 at 6:20 am to upgrade
They use GPS now to establish benchmarks.
ETA: that is one of the most boring jobs ever! Sat on side of the interstate for 10 hours watching a GPS antenna.
ETA: that is one of the most boring jobs ever! Sat on side of the interstate for 10 hours watching a GPS antenna.
This post was edited on 8/13/16 at 6:40 am
2
Posted on 8/13/16 at 6:39 am to civiltiger07
But bechmarks existed well before satellites. Like 1800s.
Think of another way!
Think of another way!
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).
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