How does that work?
Shawn, there at least three ways to do it that I know of. The simplest way is in software that does it for you. Trimble is the one I work with and you just use their local site setting option. It asks you for the scale point that you want to use and the scale factor. In the case of the DOT coordinate system you input grid point 0N and 0E and whatever the scale factor is for the project. so if you have a scale factor of 1.0003 at state plane coordinate N100000, E100000 the coordinate you will work with will be 100030, 100030 but the LAT, LONG will still be at the state plane number.
The other two ways are more complicated but once you think it through it's pretty simple. You "tweak" the false northing and false easting at the origin point of a projected system and adjust the scale factor. This is how I've found works best in autocad.
If you want an example just send me an email at [email protected]
And I work almost only in transverse mercator.
I have files set in Survey Controller, one for the Central Zone, another for the North Central zone. Just open a file based on the zone you are in, then start a new file using the job name. Survey Controller will bring in the parameters of the previous job. Apply the surface adjustment factor TxDot uses for each county and save it. I have a list of the suface adjustment factors for all the counties in the state.
On TxDot jobs I can then use WAAS correction to get within 3 feet for locating the control points.
I haven't figured out the South zone yet because N0.00 E0.00 winds up south of the equator. Not sure about the south central zone.
James
Ah. Ok thanks for explaining that guys.