Anyone know an easy way to combine data on two different State Plane coordinate systems into one AutoCAD Civil 3D drawing file? My project crosses a state line, which of course is also a county line. In addition to a conventional ground survey, I have GIS data from two counties on two different coordinate systems.
In Civil 3D...no clue.
I do have a bunch of DOS programs that will do that slicker than snot on a doorknob.
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My COGO and analysis is done from WGS84 data and my reports are produced in whatever projection the client requires.
Corpscom batch files
Agree. Corpscon to get everything in the same datum, probably in lat-lon, and then to the projection of choice.
The NGS coordinate converter also processes batch files. I haven't used it in batch mode, but it has a lot of flexibility.
You can do it in C3D but for each drawing you need to specify the correct coordinate system in the prospector.
For point files you can set up import formats with know coordinate systems. When importing you just tell it to perform conversions when able. This works great for the horizontal by does nothing for the vertical.
For drawing lines you have two options. For simple drawings you can output, using 'mapexport', the line work as shape files then import the shape files, using 'mapimport', into the desired drawing. You can also use the MAP features in C3D to attach a drawing and insert by query. I can not remember the exact steps for that option without actually doing it.
Good Luck
ASSUMING that:
1. State/County #1 ??State Plane? data is expressed in NAD83(2011),
and
2. State/County #2 ??State Plane? data is expressed in NAD83(2011),
and
3. Your ??conventional survey? is tied into NAD83(2011) in some fashion,
Then no sweat...
Generate an Oblique Transverse Mercator LDP that fits your ??conventional data.?
Convert County #1 to your LDP
Convert County #2 to your LDP
Bingo!
Of course if either (or both) County data sets stink, then the results will stink too!
Loyal
?ÿ
Do you have a way to determine whether "state plane" coordinates are really state plane and not some modification of state plane; ie, some sort of ground coordinates?
The only way I know of...is to simply TIE a few of the (supposed to be SPC) points into the NSRS, and "do the math."
Obviously if "one" always ties their survey to the NSRS, then the rest is EASY!
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