MightyMoe is right on – we will all likely be dust and long forgotten before FEMA does anything systematic about updating the maps. Regrettably the a...

As previously stated if possible always use the passive bench marks published by NGS to do your work. If not realistic and you use OPUS please make s...

See NGS 2010 Bench Mark Reset Procedures --/p> Pages 12-17

If this is a project in NAD 83 (2011) and it's in a state that is legislatively defined by the U.S. Survey Foot then it should still be in USSF. The ...

1. Current measuring equipment provides greater positional accuracy than state plane coordinate systems are capable of reproducing. Please explain yo...

Should be fun - livers are bad and must be punished.

We'll be there. Looking forward to seeing everyone.

NEVER use the Molodensky 3-parameter transformations. These were all computed by the old Defense Mapping Agency (DMA), now the National Geo spatial-I...

While each CORS will vary a bit in general NGS uses two weeks of data to ensure that any new station is stable in all three positional components (lat...

Tony's heard my rant on these topics before. What we have are an array of "professionals" who are required to learn the fundamental issues of boundar...

A night by the fire at Corbin and a wee dram of something stimulating with great friends is a wonderful way to spend some time. We'd love to do that ...

Map of CONUS positional shifts NAD 27 to NAD 83. 100 m on the west coast more than that in Alaksa and 400 m in Hawaii although that was a different d...

"Official" NGS NAD 27 geoid separation map. I suspect that not many outside of those of us who worked on the NAD 83 adjustment have ever seen this.