Flat Earth NOT - how to properly measure Earth curvature over land or water - Geodetic Survey

Written by Super User. Posted in Uncategorised

Dear Readers,

Answering the question, "what is the best way to measure Earth curvature over land and water?"

From professional surveyor Jesse Kozlowski...
Well to answer your question right up front, just use 2 carrier phase multi-frequency GPS receivers to measure the dxdydz vector. That's how we have been surveying since the 1990s.

The results you get using high precision GPS will closely match the older pre-GPS methods such as triangulation and electronic distance measuring techniques combined with measuring the vertical angles with high precision theodolites.

For a list and the links to look at the way surveying has been practiced for many many decades resulting in the mapping and charting of everything we see all around us, check this vid I made ... Surveying Standards and Specifications For Guiding Mapping And Construction Video Link - https://youtu.be/MBWnTiTkPos
Published on Oct. 28, 2018 Description: See the pinned comment for the full list of Standards, Specifications and Best Practices Guidelines Related to Surveying Measurements For Mapping And Construction

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From professional surveyor Jesse Kozlowski...
Also, check my video using GPS and theodolite measurements across a lake ... Flat Earth Proof? - Perfectly Flat Level Lake Published on November 18, 2016 Video Description: The smooth calm water of Cooper River Lake was used as a level reference to set 2 spikes at the same elevation. These two level points create an inter-visible line of sight 7,311 feet long across the level water surface. This experiment makes apparently obvious the distinctions between the terms FLAT, LEVEL and HORIZONTAL for anyone with eyes to see and ears to hear. See for yourself.

Video = Perfectly Flat Level Lake - Flat Earth Proof?
https://youtu.be/ZlP3njwf6h0

Perfectly Flat Level Lake - Flat Earth Proof? -
The smooth calm water of Cooper River Lake was used as a level reference to set 2 spikes at the same elevation. These two level points create an inter-visible line of sight 7,311 feet long across the level water surface. This experiment makes apparently obvious the distinctions between the terms FLAT, LEVEL and HORIZONTAL for anyone with eyes to see and ears to hear. See for yourself.

Jesse's Observations and Measurements, data log posting with pictures
https://jessekozlowski.wordpress.com/2016/11/05/looks-perfectly-flat-and-level-to-me/

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Video = Flat Level Lake Measurements - Flat Earth Proof?
https://www.youtube.com/watch?v=y-SEsJLTodc&t=100s

Flat Earth Proof? - Flat Level Lake Measurements
Jesse's Observations and Measurements, data log posting with pictures
https://jessekozlowski.wordpress.com/2016/10/27/flat-level-lake-measurments/

On a calm day, Union Lake served as a level reference to set stakes at the same elevation on opposite sides creating an intervisible line of sight over the water surface. Repeated sets of near real-time reciprocal vertical angle measurements were made between the stakes. The results are presented here.

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Other videos on Jesse Kozlowski's YouTube channel that explain in detail, GPS, Theodolites, GNSS, and more surveying information.

Global Positioning System GPS Fundamentals A Video Lecture
https://www.youtube.com/watch?v=B2yolBN1CCM

GPS / GNSS RINEX Navigation File - Keplerian Orbital Elements Explained
https://www.youtube.com/watch?v=xSlNYKALf44

GPS Explained In An Eastern European Accent
https://www.youtube.com/watch?v=ygdAqxxH98I

GPS ANTENNAS MOUNTED ON BUILDINGS - PROOF
https://www.youtube.com/watch?v=PwR_4WRB5Mw

Chapter 5: Land Surveying and GPS
https://www.e-education.psu.edu/natureofgeoinfo/c5.html

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Bob Measures the Curve, by Bob the Science Guy
https://www.youtube.com/watch?v=aPZ096frjAI

In 2500 feet, the earth curves approximately 1.5 to 2 inches. Can this be measures with inexpensive, but purpose designed tools? Join Bob as he measures the curve of the earth in his backyard.

Details on Bosch GOL 24 Professional https://picclick.com/Bosch-GOL24-Auto...

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References - Standards, Specifications and Best Practices Guidelines Related to Surveying Measurements For Mapping And Construction.

NGS Publications: Alphabetical Listing
https://www.ngs.noaa.gov/PUBS_LIB/pub_alpha_list.shtml

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Flat Earth NOT - how to properly measure Earth curvature over land or water - Geodetic Survey