Comes on a regular basis, lots of good info.

John Hamilton's assessment is absolutely correct. Regrettably I have found that the overwhelming community of those using NGS geoid models treat them...

Great stuff, still available from Bernsten.

Forgot to mention also make sure you know the epoch of your WGS 84 values, the epoch for NAD 83 (2011) is 2010.0, you will need these to properly use ...

Here’s what you do 1: back out of your EGM98 height to you original WGS 84 ellipsoid height. Make sure you know which iteration of WGS 84 you have ...

If you want the most correct astronomic bearing be sure to also apply the LaPlace correction using the NGS tool DEFLECT18.

The accuracy of GEOID18 is generally in the range of 0.1 to 0.15 ft Easily checked by running the utility on the NGS web site.

With that way NGS has been hit by this administration I suspect it will be some time before they’ll be able to but resources to fix that.

Next Tuesday (29) we’ll be attending a retirement event for 20 who will be leaving by the end of the month. During my 40+ years at NGS nothing like t...

Your datasheet is good, and I commend your use of pictures and the concise information you present. Assuming you expect this datasheet to be used by o...

All the ancillary marks triangulation marks (RMs & AZ MKs) have PIDs they just don't normally have either an accurate horizontal position or heigh...

"Would they delete old datasheets though?" -- It has to be something exceptionally drastic for NGS to actually delete a station from the Integrated Da...

2010

I was on the NGS datasheet committee for the last 15 years of my service. The vast majority of reference and azimuth marks for triangulation stations...

For NAD 83 only four states (AL, AK, HI and MO) have never legislated a specific foot conversion although in general they all use US Survey Foot. In ...

Oldmanriver and firestix -- New guys! My first work with them was when it still Army Map Service (AMS) in Bethesda.

I had the immense honor to know one of those, Francis Popper who was a young C&GS officer serving at the Manila office during the attack, he was a...

Actually lurker was pretty close. I had the responsibility of automating hundreds of triangulation observations from that period when NGS was buildin...