FWIW,Both the IGS and NGA produce a posteriori precise ephemerides. These ephemerides differ from those broadcast by the satellites by being produced ...

Howdy,Not sure I understand your question. As for the question of how accurately we know a satellite's position, see the following table:Keeping the s...

:'( Imagine my surprise when I set my $100 Garmin on the zero longitude line in Greenwich and found it to be misplaced.:-D

Howdy,The NGS Geodetic Glossary has this. Note the second to last sentence. true - (adjective) (1) Actual, existing, or observed, as contrasted to ide...

Not being expert on these matters, I nonetheless wonder why resort to a 2D system when trying to understand real-world 3D changes. Why not use geodeti...

Howdy,FWIW, on the matter of tidal datums and tidal epochs, you might find the following links of interest. The last link is to a specific site here i...

Howdy,FWIW, those interested in the ancient approach "solving it yourself," can take a look at the now obsolete Army Surveying Computer's Manual. It i...

My two cents...Most likely, the minimally qualified person would be offered to lowest salary. Should there be an exemplary candidate willing to put up...

Howdy,Convert your TPS file to RINEX using the utility ar:br>Find and download the appropriate version of UNAVCO program "teqc."Read the teqc document...

Howdy,I enjoyed your article and found the graphics to be excellent.Cheers,DMM

ApologiesMy error. While clearly indicated to be in foot units, I saw them as metric. Mea culpa.

Howdy,You are worried about the disagreement between first-order differentially determined NAVD 88 heights and OPUS-derived heights. Perhaps you might...

Howdy Mr HamiltonObviously the definitive answer comes from NGS. If you look at a point with multiple occupations (e.g. AH1762) you will see that curr...

Howdy,The RINEX files I get frequently have wrong HI's. Requiring manual entry of the value is required by AUSPOS as well as OPUS.Also, remember that ...

Howdy Loyal,I agree completely. Looking at the problem in Texas it appears to me to be a bad value at a critical location. Looking at the publicly ava...

Howdy,Copy the teqc executable and existing RINEX file into the same directory. Open a command prompt and navigate to where you put the files. From t...

Howdy,I do not understand this comment. Geoid 2009 (as well as all previous versions back to Geoid 1999) is available on the NGS web site. I just chec...

Howdy,For what it's worth, I took a look at the data related to LA and thought those following the issue might find the following links to be of inter...