Last seen: May 28, 2026 2:28 pm
Third-Order - Do you mean horizontal/geometric or vertical or both? The order of accuracy terms (e.g. First-, Second- and Third-Order) are defined na...
Careful with your convergence angle. The convention is that you add algebraically (add if positive, subtract if negative)- the same as the LaPlace co...
I prefer using the recovery submission in DSWorld -- DSWorld. It also allows me to submit updated positions for bench marks with only scaled position...
You will love the new vertical datum NGS plans to role out in 2022 - bench marks will be a thing of the past, they will not define the datum - the ver...
So what you're saying is you're using the slope of the geoid height differences not "the geoid." This makes sense. While the absolute accuracy of th...
Could you please clarify what you mean by "applying the geoid to the elevations instead of the ellipsoid." I don't understand what you're trying to s...
You should also be aware of how accurate NGS thinks the geoid model in your area is - GEOID12A accuracy maps
Sorry, I meant Done - that's what happens when you type in Base 9!!
First, it is important to make sure of what you are trying to accomplish. When you say MSL to you really intend it to be Mean Sea Level. MSL is a sp...
Adjusting the geometric reference frame (i.e. NAD 83 (2011)) is a MASSIVE undertaking. Given the resources required to perform such a task I would su...
While the GRS80 and WGS 84 ellipsoids are virtually the same the ITRF is a coordinate system not an ellipsoid. Since the DoD keeps redefining WGS 84 ...
WGS 84 and NAD83 differ by approximately 1m horizontally across the lower 48. They are NOT mm difference.
Be very careful. SPCs are defined legislatively in NAD 83 only.
USC&GS Special Publication 158 "Bibly Steel Tower for Triangulation" -- authored by Mr. Bilby himself.
If you know the PID go to "Datasheets by PID" page. In the menu below the box where you enter the PID select the tab that says "Include Destroyed Mar...
For updates to the NGS River Crossing investigations you should contact either John Ellingson ([email protected]) NGS Wisconsin state geodetic a...
The definition or realization of the new vertical datum to replace NAVD 88 (and the other island datums) in 2022 will not include any bench marks - it...
In and of itself, sea level change (up or down) should not have a significant impact on a nation's vertical datum. Every vertical datum I've ever see...