While doing some computer link maintenance I came across this excellent resource on heighting at: Like most subjects there are various ways to appro...

Whenever I hear of the prospect of funding for worthwhile projects or programs, I am always reminded of federal budgeting works. I am also disheartene...

It is always a challenge to find the appropriate level at which to address these issues. That said, I believe you would benefit by reviewing the NGS G...

While responses to the original post seem centered on the changes in SV constellations, few mention the changes in meteorological conditions one exper...

@loyal i confess to not using NOTEPAD in decades. I prefer either Vi/Vim/GVim or “grep” in Unix or a Unix emulator like Cygwin (for Windo...

@rover83 As indicated elsewhere in this thread, there is a big difference in the types of surveys users perform. For the most precise surveys the abs...

@bill93 The thinking at NGS has always been to gather as much information as possible in order to not only process the observations but also to test ...

I have always been a fan of check lists and the like. I copy below an NGS Observation Log. It may not be the most recent or may have been superseded. ...

@larry-scott BTW,is a nice reference for new and experienced GNSS operators. I plead guilty to muddling my post. 

Having been ƒ??sheltered in placeƒ? too long, I annoyingly provide the following excruciating details: 1. The design of the NAVSTAR GPS included the...

@john-putnam To spare the OP the need to search, here is a presentation including RINEX file samples:/p>   the RINEX file format is completely...

@base9geodesy Tell Renee Maybe I’ll see her the next time we’re both in Dublin. I’m overdue for another visit. Hope you and yours ...

@nezuko216 I prefer to the IERS technical notes available here: Number 38 is for ITRF2014.  As for applying differences in time to your compu...

@nezuko216 Looking at the following IERS page: We see the paucity of stations in Southeast Asia. There is a relatively recent site at Chulalongk...

I note that you refer to the ƒ??original version of WGS 84 with the date 1987. While the original version of NAD 83 is labeled in NGS records as NAD83...

I agree that HTDP is the best tool. I also recommend reading the documentation. For more detailed info on the relationship of WGS and other datums see...

@paul-in-pa You have obviously not read the book (at 141 pages it is hardly an “article). This book highlights the need for a more robust infr...

I do not agree. The document is interesting reading. Especially for those engaged in more challenging work. From Chapter 8, I copy the following: ?ÿ