Offhand, it would seem that A depends on the sum, B + C, so it looks like the variance of A would be the variance of B + the variance of C and the sta...

I downloaded the NADCON program from the link at the bottom of the page here:The drop-down boxes on the input screen list USSD and a host of other cho...

Thanks for the instruction. The information is great and watching professionals attack and solve a problem is priceless. NADCON 4.2 can be downloaded ...

And here are two links that may be valuable until we get to the corner.

Help is just around the corner, about midway down in the first column.

Scott and Loyal are absolutely correct. NAD27 is not USSD. Here's a presentation on the history that Dave Doyle did: Look at page 31 to see how big t...

What you have from the NGS software are NAD27 State Plane coordinates. If that's what you want, then you're home. If you want to convert the old publi...

Or you could say that 1 second = pi/648000 radians. Then use the radius of the earth as 3956.5 miles based on the GRS80 ellipsoid and get 101.3 feet.

That wouldn't be from the NC Bridge Inventory file, would it? Several years ago I wrote software to convert federal bridge inventory text files to kml...

That helps. Apparently they verified the house number but not the street name. The demolished house had damage, but it had been declared structurally ...

base9geodesy, post: 363286, member: 7189 wrote: The only way to get real WGS 84 values is to perform an autonomous position just with respect to the s...

base9geodesy, post: 363263, member: 7189 wrote: ... by publishing the change as a notice in the Federal Register. Does a West Virginia surveyor need...

Field Dog, post: 363241, member: 9186 wrote: Prior to receiving your email, we had talked with Mr. Trent and he assured us that we need not worry abou...

It's interesting how avoiding a potential problem in applied mathematics can create a different problem somewhere else. State plane coordinates are hu...

Which is 2 parts per million or about 1 foot in 95 miles. I messed up the calculation; thanks for correcting me.