Jon Collins, post: 407074, member: 11135 wrote: The sw nw is a gov lot. ... in Iowa, Nebraska, the Dakotas, etc. But Arkansas was much earlier, so i...

There is a great variation in how well bicycle/traffic safety reflectors work. I find that the approx 1 inch ones distributed in the US are useless b...

I hadn't mentioned that I ran a Matlab script before finding the Schwarz paper. With 10 million sets I got 1.6923 which I considered quite close enou...

If you use the Tapcon in a freeze area, does the hole fill up with enough water to crack the concrete? How fast do they rust away?

Floyd Carrington, post: 406738, member: 474 wrote: Current officer training in the USN requires training to use a sextant. Makes you wonder doesn't it...

Joegeodesist, post: 406432, member: 6744 wrote: a GEIOD09 table 2 errorIt seems that table reflects the error of fit of GEOID09 to the stations that i...

I'm not observant enough, or don't recover well from surprises, because I can't match those detailed accounts. I've been at the scene in my car on a ...

The link above for the Schwarz paper that derives the 1.6929 factor takes you to a subscription site. The paper can be found for free atHe points out...

The uncertainty in the geoid model is a constant with respect to all vectors and sessions on this monument, but is still a random number taken from th...

I got my HP 15C in preparation for going back to college in 1981, and won another as a door prize later. Both still work, and I would hate to have to...

If I read the abstract of that paper correctly, the estimate is sigma = range / 1.6926. That makes some sense; you expect three samples of a normal d...

Few people will know it, but it would seem he did more to improve the world than Princess Leia.

BushAxe, post: 406396, member: 11897 wrote: position stability of the CORS That gets into the reported pk-pk on the ellipsoidal height and the actual...

I didn't do the basic research. Thanks for pointing me to it.Output from GEOID12B[PRE] latitude longitude N error (95% confiden...

GeeOddMike, post: 406343, member: 677 wrote: I would not be surprised if the did not use the uncertainties available from their Geoid tools. Whatever...

Tripod settling got to me today. Yesterday was just above freezing and legs went into grass-covered dirt, but the height measurement showed end of st...