I would want any prospective service provider to indicate how they will validate their results? Providing plans using a priori error and accuracy valu...

Lovely area. Unfortunately there is no station name stamped on the disk.

Reviewing replies to the OP, I do not see reference to using intersection stations observed at known points as a means to verify astronomical observat...

Hey! The webinar is tomorrow! See original post.

I wish NGS would post these notices to this (and other) sites. While I have posted them in the past, due to travel and other issues, I have not done s...

The corrected link to the NGS geodetic leveling presentation is here: Enjoy, DMM

While the original poster provided some details about his procedure, I wonder whether he applies the corrections used by the US NGS described (with li...

I don’t know whether Jalbrz monitors this site. His contact information is found on this webpage: He is the NGS Advisor to the Appalachian region.

Proceedings for this and previous meetings will be available at the site above.

@john-hamilton Good find. I remember seeing that note. It does not appear on the new model’s home page. It should be. I find it amusing that the en...

Per Mackie’s “The Elements of Astronomy for Surveyors” 9th Ed (1985) see pages 37-39. To calculate a geodetic azimuth (Ag) from an astronomic azimuth...

Time flies. This webinar is this Thursday (13 April 2023). Need to register now.

@jim-frame Interesting article on black-widow spider silk for crosshairs here: No mention of lamp black… BTW, Black-widow spiders are under threa...

@mathteacher I don’t know who was responsible for the equation. Jim Stem did acknowledge contributions from Earl F. Burkholder who did spend time a...