Clearly they don’t or didn’t. Suddenly all the globe earthers are throwing this geodacy at me. As far as I can tell it’s all triangulation at the ground level, not till it gets to the actual map makers does any of the curve maths seem to enter any of the equations!
@@davidstirling7992 yup ! Well said . Globtardia are forgetting two major factors - (1) allegedly our is supposed to be an oblate spheroid and not a globe ( they are neither ) (2) our earth has topography ranging from vast mountain ranges to very deep canyons,globlings believe it’s like a cue ball ?? A theodolite is used for comparing elevations , but firstly it is calibrated by a simple bubble spirit level - if the datum is level , then you have an unwavering reference point .
You don't. Heights are measured separately by comparing differences in acceleration due to gravity, which is constant at mean sea level. Measurement of heights relative to other points is accurate only within a local area.
Plane surveying is the process of surveying by assuming that the earth is flat. Which means the curvature or spherical shape of the earth is not considered in plane surveying calculations. Geodetic surveying is a process of surveying by considering the curvature or spherical shape of the earth. FYI -- plane surveyors and geodetic surveyors work from the same benchmarks. It's flat folks.
Very goog video for begineers. I am very excited about more advanced topics related to Geodesy.
Good image of the survey for the Sydney Harbour Bridge
When surveying a distance between two points, how does one differentiate between elevation change and earth curve?
Clearly they don’t or didn’t. Suddenly all the globe earthers are throwing this geodacy at me. As far as I can tell it’s all triangulation at the ground level, not till it gets to the actual map makers does any of the curve maths seem to enter any of the equations!
@@davidstirling7992 yup ! Well said . Globtardia are forgetting two major factors -
(1) allegedly our is supposed to be an oblate spheroid and not a globe ( they are neither )
(2) our earth has topography ranging from vast mountain ranges to very deep canyons,globlings believe it’s like a cue ball ??
A theodolite is used for comparing elevations , but firstly it is calibrated by a simple bubble spirit level - if the datum is level , then you have an unwavering reference point .
You don't. Heights are measured separately by comparing differences in acceleration due to gravity, which is constant at mean sea level. Measurement of heights relative to other points is accurate only within a local area.
Thank you, this was very informative!
Plane surveying is the process of surveying by assuming that the earth is flat. Which means the curvature or spherical shape of the earth is not considered in plane surveying calculations. Geodetic surveying is a process of surveying by considering the curvature or spherical shape of the earth.
FYI -- plane surveyors and geodetic surveyors work from the same benchmarks.
It's flat folks.
flat and stationary...proven!!
the globe is ridiculous
Geodetic surveyors don't work from the benchmarks, they establish where the benchmarks are in the first place.
good thing the earth is flat...
flat