Melita Kennedy,

I stumbled across this thread when searching for a way to convert state plane coordinates to lat,lon values on the fly in Sql Server. I have found the guidance note 7.2 document you noted and am overwhelmed by the math

Before I dive too deep into trying to understand it, I first wanted to check and make sure that we can/should be able to convert our data to lat,lon values using the formulas provided.

Below is a screenshot of the coordinate system properties most of our data is within (Iowa State Plane NAD 1983 2011, wkid: 6463).

If I had an x,y coordinate pair (below), can we use the formulas in note 7.2 to conver to lat,lon?...if yes, what formula exactly would we need to use?

Any help you can provide is much appreciated!

x: 5402473.342

y: 3421155.895