This is a reupload from my YouTube Channel: https://youtu.be/p1n1AxJJMWk

In the first 2:33 of FECORE's Force the Level Pre-Test Results, I offer extensive critique.

Original Video: https://youtu.be/7EtcRbfMk6E

Nathan Thompson's video Force the Level Discussing Details w/ Globebusters / FE Core
https://youtu.be/HdwVKYdJSUQ

Jesse Kozlowski's videos with and/or concerning Chris VM
https://www.youtube.com/watch?v=2WUchzkLUWA
https://www.youtube.com/watch?v=JCVY9yvyFBE
https://www.youtube.com/watch?v=72U92YC_Tzo
https://www.youtube.com/watch?v=1OjJwi8CGok
https://www.youtube.com/watch?v=NGxXqv3a7xg
https://youtu.be/HqLPBsgldtA
https://www.youtube.com/watch?v=8U8uBu3wl-o
https://www.youtube.com/watch?v=Uu1_VuS7H5I
https://www.youtube.com/watch?v=KE06dG4kKjI
https://www.youtube.com/watch?v=xOuTB1g2d4k
https://youtu.be/fHBrqD6idYI
https://www.youtube.com/watch?v=8kPnPT7ckQM
https://www.youtube.com/watch?v=KNTYsu-9Vbo

Working with Grid Coordinates, by Richard J. Sincovec, LSI
http://www.ejsurveying.com/uploads/2/5/6/6/25668328/working_with_grid_coord.pdf

A Guide to the Mathematics of Map Projections, by Rod Deakin
https://www.researchgate.net/publication/228492443_A_GUIDE_TO_THE_MATHEMATICS_OF_MAP_PROJECTIONS

NOAA - National Geodetic Survey Geodetic Publications
https://www.ngs.noaa.gov/PUBS_LIB/pub_index.shtml

Introduction to Differential Leveling
http://www.ce.memphis.edu/1101/notes/surveying/Surveying_4_leveling.pdf

Copyright Disclaimer:
This video has been made under Fair Use: Under section 107 of the Copyright Act of 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, education and research.

#FECORE

This is a reupload from my YouTube Channel: https://youtu.be/9YASEHZlYvw

FECORE has yielded to the facts that they cannot claim that Chris Van Matre is licensed. They were violating Colorado statutes by stating that Chris is a professional surveyor.

What other facts will FECORE recognize? That remains to be seen.

Copyright Disclaimer:
This video has been made under Fair Use: Under section 107 of the Copyright Act of 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, education and research.

#FECORE

Reuploaded from my YouTube Channel: https://youtu.be/YMqEzCfJeGc

#FECORE
FECORE falsely claimed that Chris Van Matre is a Professional Surveyor, which is not true. Chris makes no such claim on his own channel.

Force the Level May Update:
https://fecore.org/force-the-level-may-update/

Colorado Board of Licensure:
https://www.colorado.gov/pacific/dora/AES_Laws

Colorado Statutes relating to Land Surveying:
https://drive.google.com/file/d/0B-K5DhxXxJZbc0ZzancwQi1CclE/view

Some folks have been wondering who FECORE is. Let's take a look...

This is a reupload from my YouTube channel. FECORE filed a privacy complaint against this video, so I came to a free speech site to say what I want about them.

This is a reupload from my YouTube channel.

In this video, we carefully analyze the measurements made in "Measuring the Curve from Lighthouse Measurements"
Correction: NAVD 88 does not generally relate to Mean High Water. Measurements must be made carefully in the field to find the local relation. Great care must be taken when applying this relationship.

The change in elevation, when no rod is used at the target, is determined by the following, when looking below eye level:
-(tan of angle x horizontal distance) + HI + (Curvature & Refraction coefficient x distance in thousands of feet squared)

Standard Refraction and Curvature Corrections applied to elevation measurements are calculated thus: 0.0206 x distance in thousands of feet squared.
Example:
Curvature and Refraction applied to a distance of 123497.25 ft.
0.0206 x 123.49725^2 = 314.18 ft

More refraction was present than the Standard Refraction Estimate. In order to find the ratio of refraction and curvature, the zenith angle measurement to the base of Seguin was used as a benchmark. The combined curvature and refraction ratio was therefore determined to be 0.019. This number was applied to the elevation correction at Halfway Rock.

(When curvature is corrected for alone, the coefficient is 0.024)

No lidar data was available for Halfway Rock, which is why this correction estimate had to be applied to the elevation there.

Links:
NOAA Data Access Viewer - for lidar data
https://coast.noaa.gov/dataviewer/#/
CO-OPS Map - NOAA Tides & Currents - for tidal benchmarks
https://tidesandcurrents.noaa.gov/map/index.html
NOAA Tide Stations
https://co-ops.nos.noaa.gov/stations.html
NOAA Navigation Charts
https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml
NGS Datasheets
https://www.ngs.noaa.gov/NGSDataExplorer/

Further Reading:
Surveying Measurements and Their Analysis by R.B. Buckner

The curvature of the Earth can be measured. There are several means to do this, with various degrees of accuracy. Here's another one. By measuring zenith angles to distant lighthouses of known elevations and heights, I was able to roughly calculate the distance to elevation zero local to each lighthouse and my own occupy station. I then curve-fit these three points and found a radius for that curve.

Note that Seguin Island Lighthouse stands at elevation 180'. The scope of my total station was elevation 76.83', yet I was looking down to the top of Seguin Light. Curvature.

Links
NOAA Nautical Chart Locator
https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml

National Geodetic Survey Data Explorer (Datasheet Finder)
https://www.ngs.noaa.gov/NGSDExplorer/

Friends of Seguin Island Light
https://www.seguiisland.org/the-island/history/our-history

I couldn't get the music to loop continuously at the end. Sorry viewers!

The tides in Maine range from about 9 feet to about 20 feet. This is due to gravity and the geography of the mainland, the islands, and the topography of the ocean floor.

Flat earthers have no data upon which to build their own tide models. They may ascribe the tidal changes to the movement of marine life or electromagnetic activity, but they have no tide models and no data upon which to build those models. They have no ability to predict tides on their own. And they are left with the fact that the vast differences in tidal ranges means that the oceans are not flat and level, even on calm days.

NOAA Tides & Currents Tide Stations Page:
https://co-ops.nos.noaa.gov/stations.html

June 12, 2019
I returned to Portland Head again, and set up on Williams Reset, yet again, to carry out the Al-Biruni Method of measuring the Earth.
Results in a nutshell:
1) The horizon still doesn't rise to eye level.
2) The Earth is still spherical.

Here are my previous visits to Portland Head, at Williams Reset:
Calculating Earth's Radius from Horizon Drop - Geodesy
https://youtu.be/dfD-rX6dmMQ
Earth's Radius Follow-Up 1
https://youtu.be/GW2xp5JG04c

The views through the scope are still images from my video here:
Does Barrel Distortion Cause Curvature?
https://youtu.be/0aYmloTS4GM

Other helpful links:
Al-Biruni's Classic Experiment: How to Calculate the Radius of the Earth
https://owlcation.com/stem/How-to-Determin-the-Radius-of-the-Earth-Al-Birunis-Classic-Experiment

The Science of Al-Biruni
https://arxiv.org/ftp/arxiv/papers/1312/1312.7288.pdf

National Geodetic Survey Datasheets
https://www.ngs.noaa.gov/NGSDataExplorer/

Music credit: "Digital Horizon", free music from Microsoft Video Editor, Windows 10.

I returned to Portland Head on May 16th and May 22nd 2019 to carry out the Al-Biruni Method of calculating Earth's radius.

This is a follow-up to my video "Calculating Earth's Radius from Horizon Drop - Geodesy" https://youtu.be/dfD-rX6dmMQ

The method still works. Further study of refraction is necessary. I had two very different humidity percentages on these two trips. As a result, I had two very different radius results. It would be great to be able to figure out how to mathematically describe these relationships from my own work. Even if I can't work it out on my own, I'm having a lot of fun in the process!

Helpful Links:
Roohif's video on refraction:
"7/6r is an UNDER-ESTIMATE"
https://youtu.be/NuPzYBrxqdM

National Geodetic Survey Datasheets:
https://www.ngs.noaa.gov/NGSDataExplorer/

NOAA Navigation charts:
https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml

Earth's radius can be calculated with reasonable accuracy from a very simple method: Measuring Horizon Drop. Ancient Mathematician Al-Biruni worked out an excellent equation for this.

R=h cos a / 1 - cos a

Equipment used:
Leica TS-16 Robotic Total Station, used in manual mode, without data collector
Leica tribrach
Sokkia heavy duty tripod
Lufkin 6' folding ruler, graduated in US Survey Feet
AutoCAD Civil 3D 2018
Texas Instruments TI-30X IIS calculator

References:
NGS Data Sheets: https://geodesy.noaa.gov/NGSDataExplo... (currently down due to partial US Government Shutdown)

Analyzing Survey Measurements: Survey Measurements and Their Analysis, by R.B. Buckner
(See section 7-2, Analysis of Trigonometric Leveling Measurements)
This book can be purchased in several places, including here: https://www.amazon.com/Surveying-Meas...

Additional Links About Al-Biruni:
https://owlcation.com/stem/How-to-Det...
https://arxiv.org/ftp/arxiv/papers/13...
https://www.youtube.com/watch?v=J8foi...

This is an application of reciprocal zenith angles. The direction of plumb lines are determined by the local gravity vector. In fact, plumb lines and gravity vectors are synonymous. Here's how to determine the divergence between plumb lines.

The field work was completed on May 9, 2019.

Jesse's Channel: https://www.youtube.com/channel/UCqfP...

Joseph Paiva's PDF: https://cdn.ymaws.com/www.nysapls.org...

R.B. Buckner's book: https://books.google.com/books/about/...

Scholarly article on the value of Reciprocal Zenith Angles in Geomatics, by Aylmer L. Johnson:
https://www.academia.edu/3190489/Do_r...