@norm I think that SPC with combined factor adjustment will slightly outperform an LDP with no adjustment. Typically, an LDP scale factor is derive...

@michigan-left Thank you! I failed to apply the t - T correction and that is the difference between my adjusted grid azimuth and the geodetic azimut...

@norm I believe that Star*Net can do exactly that.

Well, the grid distance using NCSPCS is 4,739.896 feet, so there is a huge distortion. But when I divide that by the average combined factor, 1.020651...

@mightymoe The convergence angle at Runway 05 is -19 02 42.516. The grid azimuth is 85.28132189 degrees, so the geodetic azimuth is 66.23617856 degr...

When I hear complaints about the inaccuracy of State Plane calculations, I usually formulate an outrageous example to answer them. Today's outrageous...

@norm I thought about ground but then decided to restrict the discussion to pure mathematical surfaces. The Elevation Factor is a ratio, but its den...

@norm On the problem of getting from the globe to the grid, please consider the attached ppt and let me know what you think. Same for anyone else.

@olemanriver Yes, I have that one and it clearly shows Oscar Adams' ultimate goal. Dr. Adams, though, was a mathematician and an educator. A great m...

@rover83 The note at the bottom of your picture is interesting: That makes sense, given that the instrument can only measure actual slope distance...

3. Is there ever confusion about what the surveying instrument is reporting? For example, are measured distances grid or ground, or are GPS coordinate...

The scary part is that decimal minutes is common in recreational GPS.

Yes. The 21T designation is a key that something is amiss. Actually, his point is in UTM zone 22N. It is likely that his software does not have these ...

Many years ago I had a similar problem with Alltel. I called the number and was told to send a copy of the cancelled checi. I said that I make a $50 c...