Last seen: May 28, 2026 2:28 pm
If you want to get licensed in PR contact Ms. Ruth Trujilo ([email protected]) Presidente Instituto de Agrimensores.?ÿ I am sure she will be very ...
A professional surveyor should never use a measurement tool or procedure for which they are unable to provide a reliable statistical assement.
The U.S. Coast & Geodetic Survey, now the National Geodetic Survey began using EDMs in the mid-1950s.?ÿ The first were the Geodimeter Model 2 from...
I should have added this in my previous post for completeness.?ÿ The distances of arcs was fairly easily computed back then by using USC&GS Specia...
Back in the day it was common practice for USC&GS chart cartographers to show arc seconds of latitude and longitude in meters.?ÿ To convert 1385 a...
Bless you Loyal.
For your observations to be a part of this program they must be submitted to OPUS Shared Solutions
It is important to note that the xGEOID models (currently xGEOID17 and later this year xGEOID18) do not provide an estimate of NAVD 88.?ÿ The model co...
As previously noted NGVD29 was previously called the Sea Level Datum of 1929.?ÿ It was never the Mean Sea Level Datum of 1929.?ÿ Actually the original...
At the 95% confidence level no state (or territory) has a 1-2 cm geoid uncertainty with GEOID12B. In general even in states where the model performs ...
I have it from a long time friend and colleague at NGS that there will likely be one more hybrid geoid (GEOID18?) to be released. The approximate tim...
John Hamilton and Bill93 are both correct about USGS vertical control in the NGS database. USGS declined to automate their data and submit it for inc...
The ITRF which is a product of the International Earth Rotation and Reference System Service does not have its own ellipsoid. Coordinate values are o...
A soap-box of mine - unless you are working in Earth-Centered Earth-Fixed coordinates a bench mark will not have a "Z" value. Orthometric heights are...
It would be most excellent if Mr. Best could determine the VIVD09 height for one or more of the three actual survey marks I posted previously that FE...
Mr. Best ,Go the NGS datasheet retrieval page by county - . Under "Pick a State" scroll down and select US Virgin Islands, then select "Get County Li...
Larry Best - Regrettably FEMA and a number of other federal agencies often show heights in the island areas of the U.S. as either NGVD 29 or NAVD 88....