Last seen: May 28, 2026 2:28 pm
Bill93 is correct about the vertical. The "Project Datum" should be NAD 83 (and it's iteration). In Iowa that could be 1986, 1996, CORS96, 2007 or 2...
The rebranding of Professional Surveyor is in no way intended to abandon the world of the professional surveyor, quite the opposite. This is an effor...
US "Survey" or INTERNATIONAL FOOTThe 2007 POB article is out of date. As I noted previously all but 4 states have defined a specific foot conversion ...
MA is a U.S. Survey Foot state. 6 states have legislatively adopted the International Foot for the conversion of State Plane Coordinates - Arizona, ...
An another from New Zealand, Surveyor Thompson --
The best way to find areas that really need GPS on BM observations is to download DSWorld and then using the PLOT option GEOID12A ACCURACY look for ar...
In reading your post a little closer I think you were actually using the NGS Geodetic Tool kit. First, since you already have lat/long you don't need...
My copy of CORPSCON is working just fine. The NAD 83 (1996) values I get for the first point are 41-43-21.50/69-55-40.94 and the second point is 41-4...
BeerLegger Tentatively Planned for 1-22-14 in Salem, ORI will do my best to be there for libations and dinner.
Send a note to Mark Eckl ([email protected]) at NGS. He is in charge of the division that overseas adjustments and updates to both the horizontal an...
Dave, You posted lots of very good questions. If you (or anyone else lurking out there) would like to discuss these issues in greater detail call me ...
Excellent, excellent post Mr. Mike.
FL PART OF NGVD 29The level line connecting the tide stations at Cedar Key and St. Augustine was the most southern extent of USC&GS leveling at th...
READING TOO FASTI read spledeus's post too fast. The U.S. Coast & Geodetic Survey/National Geodetic Survey often performed regional readjustments...
The NOAA Center for Operational Oceanographic Products and Services (CO-OPS) updates the national tidal datum epoch (which includes MSL among other ti...
Sorry I missed the link you provided. I find those confusing as well and I've worked with this stuff for decades. The difference from NAVD 88 to NGV...
Unfortunately NGS does not identify which of the supplemental adjustments (1933, 1947 or 1956) the superseded NGVD 29 heights are related to in this r...
What is the area you are working in? Do you have a specific NOAA tide station you are looking at? Also note that there is no such thing as NGVD 47. ...
3. Is a point that is to be exactly on the ellipsoid called a "datum point"?The latitude and longitude of all points in a horizontal/geometric datum a...
DMM's description is spot on. In the specific case of NAD 27 the coordinates for the origin station MEADES RANCH were actually derived by U.S. Coast ...