Last seen: May 28, 2026 2:28 pm
I hope I have not misconstrued the post. As originally stated "For example, for NAD27, it seems that the following equation -- called the Clarke 1866...
You are correct that the determination of the origin and orientation of a horizontal/geometric datum are independent of the reference ellipsoid. That...
NAD 83 and WGS 84Shawn is dead on. The issue that I've seen far too often (hundreds if not thousands of times) are those were surveyors (and others) ...
NAD 83 and WGS 84The "official" transformation between NAD 83 (1986) and WGS 84 (original) is 0 each in X,Y,Z (as defined by DoD in TR8350.2) with an ...
State Plane Coordinates are defined in NAD 83 not WGS 84.
Ellis Veatch, blessings and peace be upon him.
Some good resources:NGS User Guidelines for Single Base Real Time GNSS Positioningand NGS Webinar -- Real Time Positioning - Best Methods for the Fiel...
The accuracy of a single, non-networked, GPS-derived orthometric height is a combination of the accuracy of the observed ellipsoid height plus the unc...
It is important to note that when NGS generates a new geoid model that only a very small percentage of the NAVD 88 bench mark heights may have changed...
Guns don't kill people..people doI have to agree with StLSurveyor. Having been involved with GIS since the days when it was often called Computer Map...
There are several good sources for the computation of the Ellipsoid Reduction Factor.USC&GS Special Publication 8, pg 19 "Formulae and Tables for ...
For a while some time back there was some thoughts at NGS about L1 only OPUS. I'm pretty sure that's very much on hold until OPUS-PROJECTS is finally...
It will probably take more than just a scale conversion. If the map is in NAD 27 zone 17, meters that would be UTMs, not State Plane. You'll need to...
DSWorld is a great tool. In addition to being able to easily upload digital pictures to the NGS database you can also submit the text recovery info a...
NGS has encouraged new CORS to all be GNSS compatible (right now that's just GLONASS) and for those planning capital upgrades to be GNSS capable. NGS...
There are already something like 13-15 GPS CORS operating in the Russian Federation as part of the IGS network -- . They probably also track GLONASS ...
The FGCS Standards and Specifications for Geodetic Control Networks does not mandate the use of stiff leg tripods for geodetic leveling. They are how...
If you think the confusion between NGVD 29 and NAVD 88 is hard to explain and/or account for just wait until NGS releases the new geopotential datum t...
I'm curious why Trimble (or anyone else) would have an Oregon State Plane (CONUS) and an Oregon State Plane (2011)[or any other state]. The mathemati...
The old Annual Reports of the Superintendent are wonderful reading. They certainly can be expense to buy. Fortunately NOAA sacrificed a complete set...