Didn't Kent figure out, once, that he was James Turbifil?
That guy was a nut!
I have a picture, somewhere, of Rich Leu, at the Conference in LV 2005, with a name tag that said "Cam" haha
Turned a lot of heads...
@bill93, in my other reply to you I included a screenshot of his Twitter profile listing geodesist as one of his , um, things. I'm not sure if you can see that. I uploaded that image from my phone, but I don't see it. Do you?
That pic didn't upload from my phone. Here it is ...
Not sure why, but that pic taken in Peru did not load from my phone. Here it is ...
And just this morning there was this too ...
I quit participating on the field crew (I think that's the name) on Facebook because of this kind of willful ignorance. It's frustrating to be sure.
Aaron has an NGS EDM CBL located right in his own town of Midland, TX.
He hasn't used it because he says that he only sends his instruments in for service and they take care of that for him after I encouraged him to try this ...
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Aaron, you can settle all this by sharing some of your own data, not links to Wikipedia.
Try going to your local EDM CBL in your town to measure it with your GPS. Note that the published lengths are NOT projected to the state plane grid or computed as ellipsoid distances. They are purely slope distances measured by NGS using Wild Heerbrugg T2000 instruments on 2 separate days. They reduced their slope measurements to the mark to mark published lengths and the horizontal lengths. Note the accuracy is published at tenths of millimeters. See here -
Texas EDM CBLs
https://www.ngs.noaa.gov/CBLINES/BASELINES/tx
1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N311014
NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: MIDLAND CBL TEXAS
ROCKVILLE MD 20852 PROJECT ACCESSION NUMBER: 15730 MIDLAND COUNTY
NEAREST TOWN: MIDLAND
LIST OF ADJUSTED DISTANCES (APRIL 4, 1990)
ADJ. DIST.(M) ADJ. DIST.(M) STD.
FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM)
0 839.871 150 839.048 150.0694 150.0717 0.1
0 839.871 430 838.262 430.1309 430.1339 0.3
0 839.871 1420 834.969 1419.9919 1420.0004 0.5
150 839.048 430 838.262 280.0615 280.0626 0.3
150 839.048 1420 834.969 1269.9225 1269.9290 0.5
430 838.262 1420 834.969 989.8610 989.8665 0.3
The published mark to mark lengths are what you compare your EDM slope measurements with to make sure your instrument is working properly. In some states, in order to qualify to perform work for the DOT or other agencies, you are required to measure an NGS EDM CBL using your GPS to verify your equipment, methods and procedures are all working properly.
You can measure your nearby EDM CBL using 4 of your GPS receivers logging data simultaneously occupying all the marks. Then post-process all the baselines between all the marks. Note, you do NOT have to select a grid coordinate system to process that raw GPS data. That is because the raw GPS data is NOT referenced to the state plane coordinate system OR the ellipsoid, as you keep insisting and repeating. GPS is referenced to the WGS84 ECEF Cartesian 3D coordinate system.
So, all you need to do is open a new project to start a post processing session and select US Survey Feet as the units. Then, process the raw data to solve all the baselines which will be displayed as delta X, Y, and Z between all the points and the vector lengths will match the published EDM CBL mark to mark lengths AND your EDM slope measurements. You keep saying this will only work at sea level. That is wrong. GPS works at any elevation, even yours. Your GPS vectors at your elevation will match your own EDM slope measurements and will also match the published mark to mark lengths at your EDM CBL at your elevation. Try it in Colorado, same thing. EDM slope length = GPS vector length, period. [ SQRT(dX^2 + dY^2 + dZ^2)= straight vector between the 2 points) ] GPS satellites have GPS receivers onboard now and they process the vectors between all the satellites. Those vectors are dXdYdZ ECEF, not lat, long, ellipsoid heights.
You insist that GPS measures grid distances. Wrong.
You say the grid is the ellipsoid. Wrong.
You say the GPS vector is a curved line. Wrong.
You say that GPS vectors will match EDM slope distances only at sea level. Wrong.
You say the WGS84 ECEF Cartesian Coordinate System is curved. Wrong.
You say the RINEX file contains curved data. Wrong.
You say that ECEF coordinates are calculated from Latitude and Longitude. Wrong. It is the other way around, and you left out the Ellipsoid height.
You say the geoid model is involved in the GPS vector processing. Wrong.
The work we did at Lake Pontchartrain was simple and easy to see for everyone, except for you. You call yourself a geodesist. You're not. A geodesist would know all this. Stop this charade and this extremely unprofessional public display of ignorance and personal attacks.
EDMI Calibration Base Line Program
https://www.ngs.noaa.gov/CBLINES/calibration.shtml
In this article linked below, originally printed as a series of 3 installments for Professional Surveyor magazine, I purposely chose to use an example located near sea level in order to make an important point that was entirely lost on you because you keep accusing me of having never worked at higher altitudes. Wrong, and you entirely missed the whole point. This paper was written exactly for you Aaron, except everyone else gets this but not you. And by the way, the EDM CBL comparison with GPS vectors example is in this paper too. Go out and try it for yourself. You can thank me afterwards.
GPS & EDM Measurements ?? Why Don??t They Match?
http://www.sawj.org/files/drupal4/GPS_Vs_EDM.pdf
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My parting words to Aaron ...
I am beginning to think that you are having difficulties beyond understanding the entry level basics of surveying introductory topics and that continuing this any further is a futile effort. But thank you for your participation. All of it has been recorded for your review later on if you ever do reach a point that you can clearly think this through. So far, none of this has been of any help to you, but I hope others have benefited. I wish you had too, but, you cannot blame me for not trying. I will be ignoring you going forward because there isn't anything left to say on this topic of where measurements are made (GPS vectors and EDM slope lengths) and where coordinates are computed (ellipsoid, or grid projection) that could possibly help you since you stubbornly refuse to think about this sufficiently to recognize your own lack of understanding which is the beginning of learning. It seems one thing you weren't taught growing up is to not talk about anyone behind their back. The next time you have something to say about me, be a man and say it to me. I wish you all the best Aaron, but you have used up your share of kindness from me.
@shawn-billings, I've been in that fb group too and I can see what you mean, but more concerning is that they are the next gen of our profession. I think we need to do our best to reach them somehow someway. Call me an optimist. I even hold out hope for Aaron 😉
Facebook? Well, there's the problem right there. JK
I've managed to keep myself completely off FB.
Some of the people on twitter and facebook think they are "Superfly"
@mightymoe, I started a geodetic surveying Facebook group that has 3k+ members in it. None of this stuff I'm sharing here occured in that group. Aaron isn't in there. Maybe that's his problem right there:) he could have learned something there. Nope, all these screenshots are from YouTube and I've got a ton more from Twitter. The problem here is Aaron's ridiculous public online behavior displaying his own ignorance on these topics while claiming to be a geodesist.
@a-harris , are they also Licensed Land Surveyors having a duty to represent their profession professionally? They can be SuperFly too, probably without any harm. Someone who can get through to him needs to remind Aaron of this very important thing he forgot or never knew.
Good luck with Aaron?, don't know him or what he is trying to sell
Everybody has the duty to represent something, that doesn't make them Superfly
There are Super Surveyors all around here somewhere that do what they do very well
Superfly doesn't exist on social media, he is too busy and doesn't have time for a reply.
0.02
@a-harris , ?ÿthat was great. Thanks for the laugh. Now I have some kind of theme song playing in my head?ÿ .... no, wait, that's Shaft. Close enough??ÿ
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