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Registered: ‎09-16-2008
Message 1 of 3 (1,001 Views)

# ground to grid (state plane)

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09-16-2008 08:49 PM
I need to convert a topo shot with a total station to state plane coordinates. We traversed to two monuments with listed NAD83 CA Zone 3 coordinates.
How do I determine scale factor and convert to grid coordinates?
Will scaling the points and moving to state plane affect the accuracy of the topo if it is only for an area of about 200' x 200'?
Also, if listed state plane coords. are in meters will AutoCAD convert them to feet?
thanks
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Posts: 1,275
Registered: ‎10-20-2006
Message 2 of 3 (1,001 Views)

# Re: ground to grid (state plane)

09-17-2008 06:04 AM in reply to: kacieap
you could try export to landxml then re-importing the landxml into a new project with imperial units (brand new drawing, selecting imperial units).
with the landxml you can import but you will need to know 1 (one) point origin and new location. landxml import will do the rest.

projects ---> export landxml
projects ---> import landxml
*Dennis Hyman
Message 3 of 3 (1,001 Views)

# Re: ground to grid (state plane)

09-17-2008 09:13 AM in reply to: kacieap
If you know your two monuments, then you need the data sheets for the
monuments from California DNR. Your scale factor is listed for each
monument. You will need an average scale factor between the two. You can
then use the transformation settings under Projects-->Transformation....
You need to input the local system coordinates for your stations, then the
state plane coordinates as listed on the data sheet. Those will likely be
in meters, so use the conversion of 1m = 3.2808333 feet. Once you have done
this, you can label common points with state plane coordinates under
Labels-->Geodetic Labels-->Label Location. Then, if you need to move your
points, draw a line from the local system to the State Plane system on your
control points, and align accordingly. Hope this helps.

Oh, and you can specify if you want the system to be US Feet or Meters.
--
Dennis Hyman (aspiring PLS)
Stock & Associates Consulting Engineers
Chesterfield, Missouri
LDD 2004, Civil, Survey, Map
3.0 Ghz P4, Dual processor, 1 GB RAM
GeForce 4 MX 440 Graphics Card

wrote in message news:6033003@discussion.autodesk.com...
I need to convert a topo shot with a total station to state plane
coordinates. We traversed to two monuments with listed NAD83 CA Zone 3
coordinates.
How do I determine scale factor and convert to grid coordinates?
Will scaling the points and moving to state plane affect the accuracy of the
topo if it is only for an area of about 200' x 200'?
Also, if listed state plane coords. are in meters will AutoCAD convert them
to feet?
thanks

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